Tyler walked to his girlfriend's house full of excitement. Today was the day that they would have sex for the first time. They were both classmates at school and had fancied each other for ages until one day he finally plucked up the courage to ask her out. Since that day they had been inseparable; going round each other's house, going to the cinema and hanging out together. Tyler was an athletic boy who was the coach for the school football team. At just under 6 foot he was slightly taller than most of his classmates and definitely taller than his girlfriend.

Ashley was stunning beautiful and considered the sexiest in the school. She had a 34DD chest and a nice round arse which she was proud of but one thing always annoyed her. She was a petite 5 ft 5 and she hated it. Especially when dating a boy much taller than she was. They had been dating for over 2 months when they decided that they should have sex for the first time. They had both had sex before but this seemed different. Both Tyler and Ashley seemed excited and also slightly nervous but couldn't understand why. Nevertheless they both decided that today would be their first time.

Tyler ran straight to Ashley's after he finished football coaching, only stopping off at a pharmacist to buy a pack of condoms. He wasn't taking any chances. He knew that today was the only day that Ashley's parents wouldn't be home until late meaning the house was empty for most of the afternoon and evening. After running the final few streets he reached Ashley's house and knocked on the door. He rang the doorbell and was greeted by an amazing sight.

"Hi Tyler baby" Ashley said but Tyler couldn't answer. He was too busy staring at the sight of his girlfriend in nothing but a lacy black thong and a matching black bra. He felt his cock immediately stiffen at this incredible sight.

"Erm, wow, you look so sexy in that" he managed to reply

"Thanks babe, glad you like it. I bought them just for you"

"Seems a shame that they have to come off" he winked at her

"Are you going to come in or stand on the doorstep all day?" she laughed. With that he entered her house and went straight upstairs to her bedroom. Ashley's bedroom was nothing amazing, just a typical teenage girl's bedroom. Light pink walls, the occasional boy band poster, a wardrobe, a dresser and most importantly a double bed. Tyler sat down on the bed and reached into his trouser pocket to pull out a condom. He watched as Ashley entered her room and locked the door.

"We don't want to be interrupted do we?" she teased and with that she stripped off her sexy underwear and let them fall to the floor. Tyler took his as a sign that he too should get undressed. Once he was naked he felt his cock stand fully erect and pointing at his girlfriend. He saw it and smiled before grabbing his waist and kissing him. Ashley then got down onto her knees and started to suck Tyler's cock. She watched as he closed his eyes in bliss and let her do her work. He could feel her tongue moving all around his dick, he opened his eyes briefly to see her push the meaty cock deep into her throat until her face was touching his balls.

Ashley was getting hornier and wetter with every suck of Tyler's cock until she decided that she wanted him inside her. She took his cock out of her mouth and pushed his backwards on to the bed. Tyler could see in her eyes that she was getting horny so ripped the condom from its packet and placed it onto his dick. Ashley lay down on her back as Tyler thrust his cock into her wet pussy. She let out a loud moan as she felt it push deep within her. Tyler was slowly building up speed with every thrust of his hips. The faster he went, the louder Ashley became.

Unbeknownst to them, a small white light had appeared at the open window and was making its way towards the love making couple. It spread out across the room before stopping when it reached them. It was too late before either Ashley or Tyler noticed the strange in front of them as their heavy panting had meant the light was sucked into their bodies and absorbed within seconds.

Tyler was close to cumming when he felt a strange feeling in his body. He hadn't felt it when he had had sex before but he was too busy to think about what it might be. Ashley too was near her climax and felt the same strange feeling as Tyler but ignored it also.

Both Tyler and Ashley came together; they closed their eyes and felt their bodies tingle with pleasure. However their bodies weren't tingling with pleasure, they were expanding rapidly. Tyler grew until his head smashed out of the roof and his feet fell in through the floor into the downstairs living room. Ashely meanwhile had grew on her back meaning her head smashed threw her bedroom wall while her feet broke the wall at the opposite side of the room. They kept growing, demolishing the rest of the house but they hadn't finished yet. Ashley's body bulldozed several other houses in the street due to her lying down while Tyler had grown upwards, his feet now completely covering the ruined remains of Ashley's home. They were both now 50 ft. tall and very horny...