2 guys who are rivals (one is a little hot headed and the other likes to tease him a lot). One day the hot headed one approaches the other bc he rejected a girl. Hot headed thought How Cruel and confronted him. Then a ball hit the hot headed one and when he came to he was in a parallel world in the middle of having sex with his rival. In that world they are a couple and are lovey dovey. The hot headed has a hard time understanding and coming to terms with this, and doesn’t understand how they got together. But he soon starts to feel something towards him as they spend more time together. So when he gets transported back to his original world, he feels conflicted bc the Sen from that world has only been teasing him and is his rival, with no clear sign or indication that he also likes him back. It is revealed that he DOES like him—initially he was just teasing him for kicks, but then he started teasing him more bc he thought it was cute that the hot headed one kept getting mad. He eventually did fall for him but obv didnt let hotheaded guy know.
I'm Banging My Rival From A Parallel World!?