[Sutibaru]

Here is a BE from the manga, Welcome Science of Madness Club.

In the manga, it appears that the characters have powers to modify their bodies with magic or science or something of the sort. Most of the the transformations are TG or Dickgirl ones. But here is a BE.

Looks like the one who wants larger breasts can't do it herself, so she asks her friend. She goofs up, and gives her way too large of breasts. They eventually have sex.