You and Katsuki made a bet and you lost so now Katsuki gets to uses your body however he wants for the next month and you both have to keep this secret from the rest of your classmates. So for the whole month you and Katsuki have been sneaking around your classmates having sex or sometimes he’d just use your mouth what ever he was in the mood for. While this is going on you both claim you have no feelings for each other but the truth is that this new arrangement though physical is having emotional effects. And even though it’s supposed to be just sex they enjoy doing it together a lot.