9(Crossover)

An Au where Iruma is Satoru Mikami's son(so no, he wasn't a virgin when he died as he had a one night stand with a woman) but he died before Iruma's mother could tell him that she was pregnant.

Iruma's story is pretty much the same as canon except that is known father is actually is stepfather.

When Iruma ended in the Netherworld, every primordial demon and their true descendants felt his arrival as his presence felt similar to Rimuru(who by the time Iruma ended in the Netherworld had already defeated every canon enemy and was ruling Tempest in peace...or as much peace as possible with the people he is surrounded by) and the last person(people if you count Ciel and Emil) who felt like that was Shinsha who was Rimuru's daughter.

This lead Rimuru's primordials to create a plan to find Iruma's connection to Rimuru so Violet entered the school in the same class as Iruma(I don't wanna change any of Iruma's classmates so Ultima is one more student instead of taking the place of another student).

How things would go from here? It is up to the writer but it would be interesting to see Ultima's pov of how much Iruma was like Rimuru especially on how they attracted similar people to surround them or Iruma and/or Rimuru's  pov of finding out they are parent & child. Ships are also up to the writer but I would like to see a bit of Iruma x Alice even if they aren't really a ship(just a hint) or the end ship.