Sexual discipline (слэш)

Dystopian idea;
Criminals are to serve their sentence in public glory holes. Small crimes like theft, vandalism or like in pro hero Katsukis case: offensive behaviour and bad language. He is sentenced to a week of sexual discipline in a public glory hole in the restroom of the biggest park in the city.
Janitor Kirishima is on cleaning duty today for this exact place, and he already knows he has a famous guest.
And when he sees this plump ass that is exposed in the hole in the wall, he can't resist to try it out for himself....