You ran inside, eager to catch a glimpse of your little sister Tina, who  had taken pills that would increase her breast size and grow her ass  too. At the moment, Tina had almost no chest to speak of, although her  butt had a decent shape to it due to her constant workouts. She always  complained about having no boobs and being the smallest in her class, so  it felt right to give her a boost in the right direction.


 Walking into the front hall of your house, you saw a nice round butt,  stuffed into some tight booty shorts, bending over. Maybe Tina wasn't  home, you thought. Maybe it was just a stranger. But the girl stood up  and spun around -- it was Tina, but she was about 4 inches taller and had new assets on her chest. She  had grown boobs alright; the pills had worked their magic on her and she  now had decent sized B or C cup tits. You gawked at them and Tina  laughed. She started explaining something about how they "just started  growing" but you weren't really paying attention because you were too  focused on her boobs. Tina had boobs! They even jiggled a tiny bit  whenever she made any sudden motion. Her clothes fit her poorly now  because her shorts were too tight on her enlarged ass and her shirt had  turned into a crop top, only coming to her midrift.


 You looked at Tina's face and she really looked older - her features  seemed more mature... she had light blue eyes, sandy hair that fell to  her shoulders and very prominent lips, which featured a charming smile.  "I wonder if my growth has anything to do with Mom's?" she said, after a  few minutes.


 "Do you, uh, like your growth? Do you like being bigger?"


 "Like it? I LOVE IT!! I wish I was even bigger! I'm probably about 5'5''  now, imagine if I got even bigger! Mmmmm that would feel so good!"


 For a split second you thought about telling Tina about the growth pills  Karen had been taking and you had given her without her knowing, but  you thought better of it. If Tina wanted to grow, who were you to say  she couldn't?


 Tina mumbled something about going to go downstairs to workout and lift  weights. You went upstairs and heard the shower running in your mom's  room and Karen singing a song from within. You snuck in and empited all  three bottles into your hands -- in total there were three height pills,  two BE pills, and two AE pills left. You ran downstairs and went to the  kitchen to whip up a cocktail for Tina... a "post-workout shake" you  thought. Crushing the pills all into the drink, you suddenly remembered  the warning on the pill bottles not to have more than two of each pill  daily.


It probably won't hurt to have a little extra...growth... you  thought, with a smile. You imagined Tina as tall as your mom, squeezed  into a tight bikini and the three of you living together, in a growing  household, getting closer to each other, in more ways than one.


 Downstairs, Tina was doing some squats and you were surprised by how  much she was lifting -- she was up to almost 100 lbs! Her derriere  looked bigger with every squat she performed and Tina was probably  loving her booty gains and the effect it was having on her handsome  older brother. You couldn't help but stare as your sister's ass wobbled  and bounced around her tight tight shorts. You wondered what kind of  panties she was wearing, if any at all.


 "Is that for me, big bro?" Tina asked, swaggering over. Without your  answer she took the drink and gulped it down greedily. Her eyes shone,  almost lustfully.


 "Back to the weights," she said, "Time to Grow!"

Tina went over to the weights and picked up some 15 lb dumbbells with  ease and began curling them. You couldn't help but notice the distinct  bicep muscles she was developing and you wondered if they were a  byproduct of the GrowTech pills or not. She had worked out a lot before  taking the pills, so maybe they had always been there and you were just  now noticing. You had been the one who introduced Tina to working out  almost a year ago, actually. Back then, you had a bigger interest in  exercising and your little sister had followed you around, wanting to be  just like you someday. Tina's body gave a shudder and she dropped the  dumbbells with a crash.


 "What's wrong?" you asked.


 Tina didn't answer and a funny look came across her face. She reminded  you how your mom had looked that first night in the hot tub, like she  was in a trance or something. Instinctively, you looked at her chest and  rear to see if they were changing and to your amazement, they were!  Tina's boobs were filling out and expanding, they grew from a B Cup to a  C cup to a D cup, lifting her shirt up even higher. Her taut stomach  was completely exposed now and you could see the ridges of her ab  muscles showing. Her thighs also thickened and her glutes expanded  greatly. Her ass cheeks pressed outwards, filling up her booty shorts  until they were skin tight. You stared in awe at the wedgie of your  sister's shorts. Two days ago she had been a scrawny 18 year old, now  she looked like the hottest girl at your school! She had a great rack  and an amazing bubble butt that was begging to be slapped. Her face was  radiating and oozing sexiness.


 "Mmmmmhmmm..." she moaned, her voice sounding deeper.


 "Tina, are you okay?"


 She smirked. "Never better. Who knew it felt so good to be so big? And Sexy!"


 Tina gave a twirl and her tits flopped wildly without a bra, while her  ass strained against the confines of her shorts. Tina squeezed one of  her boobs and began massaging it. With her other hand she grabbed an ass  cheek and fillled her hand with ass flesh.


 "I - I should go get Mom," you said.


 "There's no rush," said Tina, putting a hand on your shoulder to stop  you from leaving. Her breath smelled heavenly, like the smell that had  come from your mom's room. "Although, I think she will be upset to see  that she's got some competition for sexiest girl in the house," added  Tina with a wink. "Come watch me lift, big bro."


 Tina went over to the bench and loaded up two more plates on the  barbell. She began performing deadlifts and you could hear a faint  ripping noise coming from her shorts with each rep she did.


 "Uhh Tina, how much weight are you using?"


 "135 lbs," she said nonchalantly, as though it was like lifting a gallon of milk.


 "Uh-huh. How are you lifting that much?"'


 "Guess my new size has brought me new strength," she grunted.


 There was something strange going on with Tina. Every time she lifted  the barbell, she seemed to be higher... she was getting taller right in  front of you! She was getting huge before your eyes, bigger than any girl you'd seen before. Her pits were getting stained with sweat now  and her growth continued. Your eyes flickered to her massive legs,  rippling with powerful muscles. The sides of her shorts were split and  you could see the bottoms of Tina's ass cheeks spilling out of her  shorts. What had you done? What had you created! She was your sister,  for crying out loud! Now, she was some kind of teen sex goddess that  kept growing bigger and bigger, until...


 thud. The weight slammed on the floor and Tina strode towards you,  curves on full display. You felt very eerie because for the first time  in your life, you were looking up at your sister. She was taller than  you, putting her at 6'2''. Her boobs had grown to a DD cup and were the  only thing concealed by her way too small top. You could see her ass on  both sides of her waist, spilling out and begging to be let free. She  was forming six pack abs effortlessly and as you brought your eyes up,  to meet hers, she smiled. You half expected a sign of aggression or  anger from her, but she seemed giddy.


 "Look how big I am!" she squealed, grabbing you off your feet and  pulling her into a tight hug, that mashed her tits against your chest.  "Nobody will be able to call me Tiny Tina anymore!"


 "Guess not," you said, forcing a laugh, as your bombshell of a sister released you.


 A shadow passed over Tina's face and her tone changed suddenly as she  said, "And I guess you won't be calling me 'Little Sis' anymore! I'm the  big sister now, which means there's gonna be some changes around  here... no more telling me what to do, "Big" bro."


 You were about to object to Tina's demands, but you were interrupted, by a call from upstairs. Your mom! How would she react to Tina's new size? Dinner was ready, so you were about to find out....
When you went upstairs, accompanied by your overgrown younger sister,  you could immediately feel the tension between her and your mom. Karen  looked shocked at first, but quickly realized what had happened and  seemed to understand.


 "So," she said, a little testily, "You're trying to give your Mom a run for her money, eh? Want to be the biggest in the house?"


 "Looks like I already am," said Tina.


 It was true -- she was 6'2, your mom was 6'0, and you were 6'1. Having  the there of you around the same height felt strange and there was a  definite power dynamic shift taking place in the family. Karen gave a  short laugh and cupped her massive F-cup tits.


 "Oh, honey, you might have a few inches on me, but you're no where near as full-figured as me! And after all, I am a growing girl..."  your mom purred at these last words. She turned around, exposing her  giant ass that was stretching her yoga pants to their limits. You could  make out the outline of a thong, wedged between Karen's massive ass  cheeks.


 Tina looked flustered and grabbed her own DD-cup boobs. They were  straining against the shirt she had been wearing before her  transformation that now was no more than a croptop, practically just a  sports bra. Tina's nipples poked through the fabric and you couldn't  help but stare at them whenever you got the chance. Tina's face was  prettier than your mom's and she was much more toned, sporting a 6-pack  compared to your mom's soft tummy. Karen wasn't fat, but she was nowhere  near as fit as Tina. For that matter, Tina's legs were also much bigger  than Karen's, because of all the time she spent working in the gym and  gaining muscle. However, your mom still had a much larger ass than Tina.  Karen's butt was like Kim Kardashian's, while Tina's was more like  Sommer Ray. But, considering that Tina had been completely flat and  shrimpy two days earlier and Karen had been short and flabby, their  transformations made them unrecognizable from their earlier selves.  Karen's face seemed to have morphed too... she looked younger and more sexy than you could remember. Her eyes seemed bigger and her hair looked fabulous. Even her lips looked fuller and plumper.


 Staring at your mom's lips, you suddenly realized how much you wanted to  kiss them. You wanted nothing more than to grow your mom even bigger,  making her taller, bustier, sexier! She needed to be the sexiest woman  on Earth and you would help her get there! You looked at Tina and felt  terrible -- what had you done? You had created a rival for your  mother... Tina could not get any bigger, you decided. You would only  grow your Mom from here on out.


 After dinner, Karen told Tina to do the dishes. Tina looked like she was  going to complain, but thought better of it. "I need some money for new  clothes," she said. "Being such a big girl has its downsides, you see."  


 "Fine," huffed Karen. She turned to you and said, "Come upstairs with me, I've got a job for you."


 You followed your mom upstairs, her ass in your face on the staircase,  and into her bedroom. The overpowering perfume scent hit you like a  wall.


 "So. Tell me. Did you give Tina those pills?"


 "Mom, I - I -" you spluttered while your mom crossed her arms under her  tits. Her bra was outlined under the white tee shirt she was wearing.


 "Don't lie to Mommy, be a good boy."


 "Yes," you said, embarrassed. "I only wanted to help her grow up because she gets picked on for being so small"


 "Well, clearly she won't get picked on anymore!" snapped Karen.


 "Sorry."


 "You shouldn't have taken my special pills without asking, or, given  them to your sister without her knowing! That was very bad of you! Now,  about your punishment..."


 You gulped. You hadn't thought about a punishment for giving Tina the pills.


 "An eye for an eye, I think," said Karen after a moment of thinking.  "You wanted Tina to get big, let's see how you like getting bigger!  Growing like me and your sister isn't all it's cracked up to be -- sure,  my tits are bigger and my ass is out of this world, but at this size,  I've developed certain... needs."


 "Needs?" you asked.


 Your mom fondled her tits and a hand slipped down to her crotch thoughtfully.


 "Yes," she said. "At this size, my sexual appetite has gone through the  roof; but with nobody to satisfy that desire... mommy can get a little  upset."


 It was extremely uncomfortable hearing your own mother talk about her  sexual needs, but at the same time it was so erotic. You wanted to hear  all about her wants and desires; you wanted to fulfill all of them.


 "I see..." You said. "What can you do about that?"


 "Oh, honey, don't pretend you're innocent. You know what I'm talking about."


 You blushed and nodded. Karen gave a saucy wink and went over to her  computer. You saw the GrowTech logo on her screen. After a few clicks,  she turned and announced,


 "6 more bottles on the way! -- 3 height growth, one boob growth, one muscle growth, and one penis growth!"  She gave a look at your groin and continued, "Your going to get big,  baby. Almost as big as your Mama. We're going to grow together and  then..."


 Karen paused, struggling to say what she had to say.


 "Then what, mom?"


 "and then, you're going to take care of mommy's growing 'needs'."


...


You  and Tina went to the mall to do some shopping for her, given she had  outgrown all of her old clothes. As you were walking around, passerby  kept staring at your sister who had grown into a bombshell. Tina was  wearing an old shirt that was now a crop top and some of your mom's  leggings. Her ass wobbled and jiggled with each step, while her tits  could barely be contained. It was a little drafty in the store and you  saw your little sister's nipples poking through her shirt. Tina either  didn't notice or pretended not to notice the attention she was getting.  Ever since she'd grown she had developed a new sense of confidence... a  confidence that came with having a huge ass, DD tits, and being 6'2''.

 Once the two of you had grabbed enough t-shirts and pants, you were  ready to go but Tina put a hand on your shoulder and held you in place.

 "Not so fast, 'big' bro. Forgetting something?"

 "Uhhh..."

 "I need some new panties and bras. Mom said I will have lots of boys now  and I want to make them happy, so you're going to help your lil sis try  on some lingerie."

 "And why would I do that??"

 "So I know what guys like and think is sexy. I've already got two dates  for tonight and I feel ready for anything..." she said with a wink.  "Y'know, you're not such a bad looking guy yourself."

 "Hey!" you yelped. Tina had just spanked you and was laughing!

 "Sorry, I couldn't resist tapping that cute little butt of yours! It's  so tiny compared to, you know," said Tina, twisting around and spanking  her own ass loudly, sending vibrations through her muscular cheeks.

 The two of you stopped in the women's department and began looking at  underwear. Tina selected a few thongs and some sheer bras and stepped  into the changing room. A few minutes later, she called your name and  cracked open the door. She didn't actually want you to... go in, did  she??

 "I'm waiting" she moaned.

 You slowly opened the door and felt your jaw fall. Two tits were in your  face, defying gravity with their perkiness, and you followed the  sexiest body you'd seen down to the pubic area to see your sister  wearing one of the thongs. Her giant thighs swallowed it up and it took  every bit of fabric to cover your sister's pussy. Tina watched your  reaction eagerly, it pleased her to know the effect she could have on  men, let alone her brother. You felt a hand lifting your chin up and  Tina laughed at the trance she'd put you in.

 "I - uh - they look --" you spluttered.

 Tina shut the door and locked it, taking a step forward. The dressing  room was quite small, so you were against a wall and her tits were  smushing up against your chest. You instantly had a boner and Tina  sensed it because she grinded her pussy against it for a moment before  pulling back.

 "Don't you wanna see the back of my underwear?" she whispered. When did she become so seductive?

 All you could do was nod and Tina patted your cheek knowingly. She  turned around, whipping her hair in your face and began grinding her ass  on your boner. It was heaven, you had never felt an ass so soft and  full. Not even your mom's giant rear could compare to the muscular butt  that Tina had. You were about to finish and heard your sister laughing.  She stepped away and left you, desperate for release.

 "You're going to help me get bigger," she said with a cocky smile. "Bigger than Mom. Bigger than anyone. Got it?"

 You nodded fervently.

 "And little Tina will take care of her big brother. She'll make him feel  soooo good. He'll deserve it because he made her into a goddess,"  purred Tina. She gave your dick a tap with her finger and you came. She  kissed your forehead and left as you slumped in the corner. What had you  gotten yourself into??

 Your phone buzzed, with a text from your mom. Pills just arrived. Hot tub tonight?

 After the very sensual encounter that you and Tina had had at the mall  while shopping for new clothes that would fit her considerably larger  figure, you felt somewhat defeated. You had just cum thinking about your  incredibly sexy younger sister and she had been the one who initiated  it! One week ago, everything had been so much different before your  mother and sister grew so voluptuous and curvy. Tina spent the ride back  on her phone, giggling to herself. What was she doing on there? you  wondered. You couldn't help but notice that at every bump in the road,  her tits jiggled a little bit. You stole shameful glances at them,  hoping she wouldn't catch you staring at her cleavage. Not that it would  matter anyways... she seemed to be fully aware of the power her new  body had over you. You had pledged yourself to helping her grow even  bigger, bigger than your mom and anyone else who might challenge her  power.


 At home, there was another car waiting in the driveway, one you didn't  recognize. It was real slick, a back mustang with flames on the sides.  Tina ran out of the car towards the mustang, her new assets jiggling  wildly. Her powerful legs let her run at an amazing speed. One of the  jock's from your high school, Brad Smith got out of the car. You weren't  bad looking yourself, but Brad was a total stunner. At 6'4'' and with  bulging muscles, he was practically every girl's wet dream. And now he  was at your house -- for your little sister. Your stomach lurched - Brad  was 18 while Tina was still a little girl! You had to protect her, but  something told you she wouldn't take no for an answer from you. Tina  flung her arms around Brad's neck, while he felt up her ass cheek.  Spotting you, Brad smirked. The two of them went inside and you followed  after them, only to hear the basement door slam closed and locked  behind them.


 "Mom! I'm home!" you called out. Karen came bustling out of another  room, wearing a revealing tank top. Then again, with her bust size,  anything would be considered revealing.


 "Hi sweetie! How was shopping?"


 You blushed and ignored the question, not wanting to mention your sister  jacking you off. "Did you see that guy Tina brought here?"


 "Mmmm yes, I did. She said they're going to be working out together. He's the football captain, right?"


 "Yeah.." you grumbled.


 "What's the matter honey?"


 "I don't know, mom."


 "Awww come here, baby," said Karen, wrapping you up in a big hug. Her  tits pressed against your chest and you could feel a boner developing.  "I know what might cheer you up -- some growth! That makes me feel  better than anything else," she said.


 "Hmm," you said. Growing bigger would let you stand up to douchebags  like Brad. Plus, it could be fun to be the big man in the house again.  "Sure!"


 "Oooo let's do it in the hot tub! We're both going to get so big! That  will be a nice little surprise for Tina when she's done 'working out'  haha."


 You could hear some moaning sounds from the basement and it definitely  sounded like there was a 'workout' going on between Tina and Brad. You  hated the thought of someone else fucking your sister... not that you  wanted to, but it felt wrong for other men to enjoy her body. Tina's  moaning got louder and it sounded like she had climaxed. Screw it, you thought. Tina  doesn't get to boss me around! I'm her big brother! Mom and I will grow  huge and show her who the real bosses in this house are. The one  thing you worried about was how your feelings toward your mother would  change once you started taking GrowTech pills. You already thought she  was the sexiest MILF ever, but once you were hopped up on pills, you  might have nothing holding you back from acting on your feelings. Then  again, maybe that wouldn't be the worst thing in the world...

You and Karen both got changed to prepare for your time in the hot tub.  Your jaw dropped when you saw the bikini that your mom was wearing. It  left almost nothing to the imagination. Her huge tits were overflowing  each side of the blue bikini cups and her massive thighs had sucked in  the bikini bottom turning it into a thong. She blushed when she saw the  way you were ogling her body although it did make her feel younger and  wanted. Ever since Tina's growth, your mom had gone back to feeling like  her old and unsexy self because there was a younger, fitter woman in  the house. Your swim trunks felt a little tight and you noticed that you  had a massive boner. Karen noticed too and chuckled.


 "Boys will be boys, I suppose."


 "Sorry, Mom. It's just, well y'know, you're very attractive and..."


 "Honey you really think I'm attractive?"


 "Yeah, I mean, for my mom at least," you mumbled.


 Karen clapped her hands and jumped up and down, causing her whole body to jiggle. "Ok baby, let's get in the tub!"


 You slid into the warm hot tub and Karen dropped down beside you. Her  breasts were bobbing on the top of the water, like beautiful  half-globes. She brought out a bottle of wine and the pill bottles. You  had never gotten drunk before with your mom, but figured if you two were  going to grow closer to each other in your relationship, then this was  the natural next step. You both needed something that would remove any  inhibitions you had about interacting with the other. It would break  down the barriers between mother and son, leaving the two of you as  lovers.


 The first bottle went quickly and before you knew it, your mom was  uncorking another. The more wine the two of you drank, the freer the  conversation felt. Your mom started laughing at the smallest of things  and you started staring more and more at her inviting curves. Karen felt  your lustful eyes and did her best to accentuate her bust, though it  did most of the selling on its own. She often pursed her lips and looked  up at you with bright little doe eyes. You knew that the wine must be  getting to you because you started feeling the uncontrollable desire to  make out with your mom. Her lips were so inviting and those blowjob  eyes.... before long, four empty bottles lay beside the tub and there  were only two bottles left, each filled with growth pills.


 "MmmMmmmm, it's been a while since I felt this *hic* tipsy," moaned  Karen. Her eyes were drooping and there was a kind of a dumb look on her  face. "Maybe some growth will wake us up."


 "Are you sure we should get bigger right now? Don't the pills have some warning against taking with alcohol?"


 "What's the worst that could happen? A little extra growth? I wouldn't  mind that, especially if it meant I got to be bigger than that little  slut of a daughter, Tina."


 "Do you think Tina and Brad are still fucking downstairs?"


 "Oh, I wouldn't be surprised. These pills give you stamina honey," said  your mom. "With all of this growth I feel like I have enough energy and  libido to make love for hours."


 You gulped and felt your dick rising in your trousers. "Sorry I made Tina grow," you said.


 "Why did you do it?"


 "Because I... I thought it would be sexy... and it was, kind of."


 "Is that what you wanted you little pervert? To have a big sexy sister that could push you around? Well, looks like you got it."


 "Yeah, I wasn't expecting it to go badly though. Who knew she'd become such a bimbo?"


 "Let's get back at her, baby. Let's grow -- just you and me! Then we'll  tower over tiny Tina and make her our bitch... mmm I could go for a nice  foot rub, couldn't you?"


 "That would be a welcome change. And Tina wouldn't even think twice about fucking another guy with me around."


 "You wouldn't be having sex with your sister, young man," said Karen.  You started to protest, but Karen continued: "I'd want your body all for  myself. With our new sizes, we'll both have some substantial sexual  needs that need taking care of."


 You were stunned: your mom had just propositioned that you two become  fuck buddies. Without thinking you pulled her in close and began kissing  her. Her lips were so soft and making out with your mom just felt right  after everything you had been through so far. You felt her large hand  on your cock and at last you were able to feel up Karen's gigantic tits.  They were unbelievably soft, yet also firm enough that they felt  pleasant to the touch. You started moving your hand from Karen's chest  to her ass, but she pushed you away and looked in your eyes.


 "What's wrong?"


 "There's something we've forgotten," she said.


 Karen held up the bottles of GrowTech pills and shook them. There were  height pills, penis pills, and breast pills. You each took two height  and one of your respective bodypart pills. With that out of the way, you  returned to drunkenly making out with your mother and the pills began  to take effect, preparing to give both of you your largest growth spurts  yet...
It didn't take long for you to begin to feel the effects of the pills.  At first their was a dull tingling that spread throughout your entire  body, from your head to your toes. And then the tingling grew more and  more intense until it felt like your whole body was radiating with  energy. You kind of seized up and noticed that your Mom had too. She  must be feeling the same things you were. Your limbs felt like they were  being stretched out and as difficult it was to believe, you could tell  you were definitely growing. Your bathing suit got tighter and tighter,  especially around the groin because your dick was rock hard. It felt  huge, at least 10 inches long.


 "Ohhh baby, it feels so good," Karen moaned. She put a hand on your  chest and squeezed. "Grow for me, baby. Grow huge for Mommy."


 Your dick thumped at those words and you felt the head start to poke out  of your waistband. Karen noticed this and laid a finger on your cock,  sending a jolt through it.


 "Looks like someone is excited to see me!" she teased. "Or perhaps, they're excited to see these!"


 And with that, Karen thrust her chest out and her bikini top flew off,  landing on your head. You peeled back the fabric and saw her magnificent  breasts bobbing up and down. Her nipples were erect and pointed  directly at you. It took a few seconds before you peeled your eyes off  your mom's tits and looked up at her face. She had a devilish look and  pulled your face into her chest.


 "Here, have a closer look... can you feel them growing? They're getting huge baby."


 "Mmmphmhmph" was all you could mumble, as her boobs blocked your mouth.  Karen was surprisingly strong. You could indeed feel them growing  though, and their creamy flesh slowly engulfed more of your head.


 Their was a ripping noise and for a moment you thought that your mom's  bikini bottom had come off too, leaving her in the nude. Actually it was  your bathing suit that floated to the top of the water and it was you  who was naked. Karen chuckled seeing you without clothes. However, her  laughter turned into a kind of velvety growl.  


 "Looks like you got bigger too. Let's see just how big my little boy  is," she said. Karen took a hold of your dick in her hands and began  stroking it. It felt like heaven.


 Your mom kept jacking you off until you felt a great deal of pressure  and then the sweet release of ejaculation. Ropes of cum shot out  everywhere and covered your mom's angelic face. She licked what she  could and then lapped up the cum that was lingering on your dickhead.  The tingling sensation had dissipated and you took your dick to measure  it. Flaccid, it was at least 7 or 8 inches. You stood up in the hot tub  which was admittedly starting to feel cramped. Karen stared at your  muscular form as you rose, water dripping off your pecs to your abs and  then draining around your balls. There was a little drool forming around  your mom's mouth and you felt her lusting after you.


 "Get up," you said. She obeyed without hesitation.


 Karen's tits pressed against your chest and she was almost as tall as you. Both of you were right around 8 feet tall.


 "You're so strong," whispered your mom. "I can't believe how big you --"


 You interrupted her by tearing off her bikini bottom which was no more  than a thong, begging for release. Her ass cheeks jiggled frmo the  movement and you turned your attention to your mom's beautifully  manicured pussy.


 "I'm gonna make you cum, mom. From now on, you do what I say. I'm in charge."


 Karen whimpered as you began licking her clit. She was going to be your slut and you had plans for Tina too.

You couldn't believe what was happening. After a drunken, lust-fueled  growth session in the hot tub, you were licking your mother Karen's  pussy. Her pubic hairs were wonderfully trimmed so that they were not  too short or long. You had never had oral sex with a girl before, let  alone a mature woman like your mother, but it felt natural to you. Your  tongue felt so powerful as it stroked her labia and then began to work  itself on her clit. You were deaf to the moans and whimpers coming from  Karen as you worked her to orgasm. Karen had sat her fat ass on the edge  of the hot tub and was playing with one of her erect nipples to  stimulate herself even further. With her other hand, she kept it on the  back of your head, ensuring you wouldn't come up for air until she had  finished and came.


 "OoohHhH MMMmmmMm...." she moaned sensually. Her voice had grown deep  and powerful. "Just like that baby.... make mommy proud... make mommy  cum..."


 You did as you were told and knew as you did so that before long, you  would be fucking the very pussy that you were eating out. There was  going to be a change in your relationship with Karen and now she was  going to do what you said. She would be submissive to you and fulfill  your every need. In a sense, she would be your slave. A slut whose only  purpose was providing for her big strong son.


 Your mom's body seized up and you felt her muscles clench before she  totally relaxed. Their was a warm liquid dripping from her pussy and you  could tell she had just cum, without her screams of pleasure. You stood  up and planted a kiss on your mom's plump lips. Her legs were trembling  and you gave her thigh a nice slap.


 "You can expect much more where that came from if you treat me right," you said.


 "Y-yes, son" she stuttered.


 The sliding glass door to the patio slid open and Tina walked out, in a  revealing sports bra and spandex shorts that hugged her muscular ass.  She had a towel around her neck and was drenched in sweat down her  neckline and around her crotch.


 "Alright, what's all this noise out here with you two?! You've been  disturbing me and Brad hooking u-- I mean working out. You're lucky I'm  not mad or else I'd --" said Tina, looking up at you and your mother's  newfound bodies.


 "Or else what, Tina? Is little sis gonna get mad at her big bro and giant mommy?"


 "H-how d-did you two? I- I thought..."


 "Doesn't matter how we got so big. All that matters is we like it," you  said. "And from now on, things will be different around here. You're  going to answer to me and mommy. You'll both take care of my growing  body and growing needs."


 Tina was looking smaller than ever before but she spotted the growth pills lying beside the hot tub....
Tina sprinted forwards, her muscular legs carrying her quickly. You were  momentarily distracted by the mesmerizing movement her breasts made and  her ass's gentle wobble. It took you too long to realize what she was  doing and by the time you did, it was too late. Tina had uncapped the  height pill bottle and stuffed a fistfull of pills down her throat. She  grinned evilly up at you and gulped them down.


 "H-how many of those did you just take?" you asked nervously.


 "Enough to make me bigger than both you. I can't wait to show you two who's really in charge around here."


 Karen grabbed Tina and pulled her across her lap. With Karen's size, Tina wasn't able to resist her mother.


 "Bad girl! Naughty girl!" shouted Karen as she spanked your sister's  butt. It turned you on seeing the two busty women interacting.


 "STOP IT!" yelled TIna. But her screams faltered and were replaced by  moans. "I - ohhh - I - I feel it... coommminngggg!!!!" she gasped  orgasmically.


 There was a stretching noise and Tina's eyes went wide. Her growth spurt was about to take place.

You stared in awe as Tina grew bigger and bigger in front of you and  your mom. Her breasts surged outwards, testing her sports bra's limits.  At the same time her hair grew longer and her features became more and  more womanly, even though you would have previously thought this to be  impossible. Tina got off your mother's lap and stood up to her full  height. She was now as tall as you!


 SSSHHHRRRIPPPP!!


 There was a loud tearing noise and your sister's breasts bounced free  from the bra that had once held them. Tina laughed maniacally, she  seemed like pure evil and was loving every second (and inch) that her  body grew. Her tits had to be at least the size of beach balls, they  were now passing Karen's in size, though proportionally they were still  smaller. Tina's nipples were a light pink and they were as long as your  pinky finger, erect.


 "What's the matter little bro? Does seeing your BIG STRONG SISTER turn  you on??" laughed Tina with that devilish look in her eyes.


 She turned around and tore off the spandex shorts, sending her titanic  ass wobbling. What she did next surprised you -- Tina began spanking her  ass and twerking. The movement of her derriere was hypnotic, you  couldn't take your eyes off it. But Karen had something else in mind.  She stood up and started yelling:


 "Young lady, knock that off!! You may be bigger than me but I am your mother and he is your brother! Show us some respect!"


 "RESPECT?" yelled Tina. She turned to face your mother. Karen looked  puny next to your sister, she only came up to the underside of Tina's  tits and was facing her rock hard abs.


 "I - I -" stammered Karen. She grew flustered.


 "Suck my tits, mom," ordered Tina. Karen hesitated but had no choice but  to obey. "You too, brother dearest." Tina patted her left boob and you  obliged. She moaned with pleasure and you and Karen sucked her tits.


 "When you're done, you're both going to make me cum. And then again. And  again. You will both live to pleasure me and I will keep growing  bigger. Is that understood?"


 "Tina --" protested your mother.


 "IS THAT UNDERSTOOD?"


 "Yes, dear..."


 "Refer to me as Goddess from now on. That's what I am -- a Goddess."

All of a sudden, Tina began shaking and trembling. Her bodies shudders  were causing her fleshy tits and ass to ripple. You popped your mouth  off of your sister's tremendous tit and watched in awe as her eyes  rolled back in her head and her head lolled about. She moaned and you  saw that one of her hands had been working her pussy. It was glistening  with moisture and you suddenly felt the controllable urge to stick  either your cock or your face in there and pleasure Tina's massive form.  


 "FUCK ME!" commanded Tina breathlessly. You didn't need any convincing  and shoved Karen to the side, who looked hurt that you were prioritizing  Tina over her.


 You mounted your sister and began thrusting your massive cock into her  pussy. You went deeper and deeper, feeling the warmth shoot up your  penis and making it rock hard. Tina was moaning louder than ever,  practically growling with pleasure. Her eyes locked with yours and you  held this look while her tits flopped up and down on her chest. She was  huge and by far, the sexiest creature you had ever encountered -- yet  she was your baby sister! How could such a transformation have taken  place?


 Your sister started breathing heavily and you felt her legs seize up and  tighten around your cock. She was starting to orgasm and had no  intention of letting you go until she was done pleasuring herself. After  a few seconds of her pussy's pulsating, she lay still and pulled you in  for a deep, sloppy kiss. She was drunk on dopamine from her orgasm and  closed her eyes sleepily. You stood up and looked at the Amazon woman  you had just made love to - your gigantic sister! Her ass was spread out  underneath her and her muscles looked huge in the evening light.


 Karen was sulking off to the side.


 "Have fun? That was pretty disgusting, you know. Having sex with your sister? Tina? C'mon..." she complained.


 "Sorry mom, I had no choice. You saw how she was when she was in heat --  she might have attacked if I didn't giver her what she wanted. Besides,  you heard her: she wants to be considered a Goddess now. There's no  disobeying a Goddess."


 "Now's our chance to depose this 'Goddess' who's really just a silly  girl. It's time you let your mother take charge, baby. Make me a real  Goddess. I want to be.. a GIANTESS."


 "How big do you want to be? Tina's already probably 14 feet tall..."


 "I want to be so big NOBODY thinks twice about fucking Tina over me... I  want men to worship my body, every inch of it! And then, they'll see...  the dawn of KAREN is upon them!"


 Your mom's lust for power was very attractive and so you obliged her.  You gave her the rest of the GrowTech pills. In return, she pulled you  in for a kiss and whispered in your ear,


 "Thank you baby. Don't think mommy will forget her baby when she grows  big... you'll be the one who gets to fuck me while everyone else  watches. You're the only man I want cumming in my pussy, got it? And boy  are you going to have some work to do, little man... Mommy's going to  get BIG!!"