[zenaku]

So here's a quick plot synopsis. The girl is known for being one of the bustiest girls in school. But the boy feels that there is something wrong. Using math, he points out to his friends that the shape is all wrong for breasts that size. The girl confronts him, pulling him aside and revealing that she has been stuffing her bra and that she actually has small(er) breasts. She titty fucks him in order to keep him quiet.
She continues to do this, and a few days later, discovers that her breasts are actually growing. More titty fucks and sex later, her breasts are the size (or bigger) of when she was stuffing her bra. True love and happy endings all around.