What if ones a bottom and ones a top lmao

I don’t think you really understand what DID implies. The other “personalities” don’t all like that guy, only one does. It’s like separate people. So even if one was a top and the other a bottom it wouldn’t matter because only Kairi (was that his name?) likes him.

Yes but- you can have sex even if you don’t like the other person lol,, kairi may like him, but the other one can just want to satisfy his sex desire, no?
So kairi can be a uke and the other personality a seme
it's the mc to decide whether that is to “cheat” or not