This didn't start out as a sport rivals AU but then that's what it turned into. Don't ask me what sport they play because I have no idea. But it is important to me that you know that they both try to destroy each other viciously when they're on the field or the court or whatever and then they have to work off the excess energy afterwards.
If anyone has any good fic recs of a similar AU, please give them to me! I just need it