As I read your story, I could visualize every scene and emotion so clearly it felt cinematic. That inspired me to ask: what if we turned it into a comic? I'm a professional digital artist and I take commissions. If you're interested in collaborating, feel free to contact me on Discord: avenia_draws

Really enjoyable story, I loved the cute, friendly atmosphere that transpired from it. 
There are a few grammatical errors here and there, (a missing comma, "food" instead of "foot"), but they are very minor, and they practically don't detract from the story. Your prose is great, snappy and dynamic, with some poignant expressions and very "visual" imagery, so to speak.

The dynamic between the two MCs is well-developed, even in the somewhat short span of the story, and it left me wonder how their story would progress. I particularly liked how you seemed to sorta build towards a classic "Bullied gets to become the bully" comeuppance scenario, with Ceri that seemed to want only to get back to Od, and then you turned it around completely, ending in a cute sweet note.

The only real critique i might have is that the intercourse scenes move a bit too fast in both chapters, i'm personally more of a fan of longer descriptions, but i can understand the want of keeping it brief. They are still enjoyable nevertheless. Also Aegea's role is a tad random at times, but i understand that's maybe just how she is.

Final note: the setting might have real potential for these scenarios, especially if they or some other students dive deep into the notes of the master of size transformations.

Overall, a great short story, thank you for that.