Street Fighter (Preferred X/F, but Open to other Pairings)
 

This particular idea doesn't quite have a legitimate storyline, but I think it would be fun nonetheless. However, during one particular fight for the tournament, a combatant uses the unconventional strategy of turning their opponent over their knee and spanking them until they verbally submit and forfeit from the match. This forever changes the precedent of the Street Fighter tournament, because not only have verbal submissions been established, but now everyone know that spankings are not only tournament-legal, but effective.

Also, we can translate this to pretty much any fighting game if you like.

I'd love to do a Street Fighter rp