This formula I stole from the lab turned a poor ugly mouse into a beautiful pretty mouse, I wonder if it could do the same for me? Maybe then step-brother will love me more? *Drinks formula* Oh no! What's happening to me?!

In this giantess growth video I play your nerdy step-sister that has a huge crush on you! You're too cute to like a nerdy girl like me though, so I stole a formula that was supposed to make me beautiful. Instead, I begin to grow, and I get fangs! Now I'm nothing but a monster, and I'm going to swallow you whole!

*Transformation Fetish, Vore, Nerdy Girl, Mon... Show more