You discreetly take a quick look around to make sure no one has noticed anything off. After making sure that your classmates aren't fake not-noticing, you focus on the teacher again. Since you like your girls thicc (not thick, that's just fat), you wish for her to have a big butt.
You smile slightly as you see her butt grow, stretching out her skirt. You feel your dick stretching against your zipper, but you resist the urge to masturbate. Even though you're allowed to do anything, there are still some principles that you'd like to follow.
As you stare, you quickly wish for people to ever forget about this little spectacle, and to think that her ass had always been this big. You look down at your desk to see a carving in the wood that says "Miss Anderson is my "favorite" teacher for 12th grade". You smile and look up, surprised to see how big she's gotten.
Her skirt had ridden all the way up her rear, and was punched up around her waist. Her panties had practically turned into a thong, and were noticeably near the breaking point. You wish for her to stop growing, and that she was wearing a real thong and some VERY form fitting leggings. You smile as you see her shirt and panties slowly morph into a boner-inducing sight. You quickly wish again that no one noticed, and that this was normal.
You watch your teacher's ass for the rest of class as she walks around and does stuff. With every step her butt jiggles some, causing you and a few other boys to stare. She eventually reaches your corner of the classroom and turns towards the girl you had felt earlier. She bends over to help her, leaving you with a face full of booty.
Since you're in the corner behind this mountain of ass, you decide to...