You couldn't help but feel like something was off about the teacher's new body, like she needed something to offset her immense bust. Then she passed you seat and you figured out what: she needed her backside to match her rack.
You concentrate, focus, and say "I wish the teacher's ass was as big as her breasts."
Within moments, fat began to ripple and bulge near her behind. The skirt started to ride up as her ass cheeks began to bulge out of her modest panties and lift up her skirt. As she began passing out homework, her modest panties were devoured by her new massive butt crack. You wish she was wearing a miniskirt and thong, and so her underwear shrunk and turned red like her bra. Her skirt shrunk to give you and the other guys a view of her pussy visible through the thong strap. You could tell her new assets were sensitive because her clit was moist. As the bell rings, she heads for her desk, her ass and boobs bouncing as she did. You get up and...