Is there already such a story? If not, imagine the standard Naked in School set up.
The girl chosen has boobs WAY too big for her tiny torso. She was chosen in part because she is recently pregnant and this will help her graduate early.
44DDD+ and must navigate the hallways, etc without the support of a bra - tits bouncing, flopping on the desk, etc. Increasingly firm and sensitive.
For added benefit, it could be that during that week she must demonstrate how to induce lactation to young/expectent mothers -
In addition/or alternatively from a guy's perspective. Shy and Nerdy, but with a 12 inch dong that is thick and constantly getting hard. Teachers used to the program who have gotten used to seeing naked students find themselves accidentally admiring the girth and talking about it. Unexpetected popularity comes with some jealousy from rival boys in the tiny dick club.
Thoughts?