I don't know if it is, but since he had sex with the alpha that makes him it's fine...
Yup that is a thing, but since he's doing it with his actual mate nothing bad happened.
and jinguuji should have realized that he is his mate because omega-kun's body didn't reject him even though he is marked.
(damn i suck at remembering names)
It's a thing, but not all authors play it that way.
The rules are more like general guidelines after all.
yep
is this omegaverse has like the thing when some alpha makes a move/try to have sex with a marked omega, the omega's body will naturally reject this alpha thing? cause damn girl you jinguuji will know