13 years old Jenny during Math Lesson

This is Jenny when she was 13.
This used to be happened on Jenny when she was in the Mathematic Class.
She was hopeless on Math, so she can't make it.
She used to be overslept during the Math class.

She's got a rare breast hypertrophy disease when she was 12. Her breast growing enormously after a year.
She's has no bra to wear that suit her size. So she go to school bra-less.

Her humongous udders bulging over her school uniform, and the buttons popped out when she was breathing.
Suddenly she's got a half naked at the top during the Mathematic Class.

Her Math teacher just standing freeze by looking at those desirable view.
He hasn't any word to say.
The class freezing until Jenny wake up by herself.