>>2782566Could reverse it. She has a friend who's obsessed with making her chest as big as possible so constantly sneaks up and grabs her tits forcing them to expand out of control. Sometimes so much it rips open her clothes, after which they shrink again once they're seen by anyone. But that obviously doesn't fix her clothes so she's now fully exposed which further shrinks them to near nothing. Rinse and repeat. She tries wearing expandable clothing but her friend just makes them grow so big that it becomes unwieldy so MC has no choice but to angrily flash onlookers to bring them to a reasonable size again. Her goal is to maintain a "perfect" cup size but she's constantly being forced to swing wildly between pettanko and mega milk, neither of which she likes.
