A subtle change

As you stand watching the Asian girl, stretch you decide that maybe you can play a little more. Exerting your powers you focus on her bust, and slowly, what was a simple B cup, increases to a C, firmly straining against the thin material of her shirt, the increased size of her breasts pulling up the hem of her shirt a little further to flash more of her stomach.

"And now into Mountain," the teacher calls and the group slowly move their hands to their sides, backs straight, and your eyes focus on her nipples straining against the top.