Two main possibilities here are:
1. Deportation, followed by an expedition by the misfit class to bring him back
2. A deal is struck. Something akin to reach rank 8 in 1 year or you get deported. Maybe his true identity even gets leaked and he needs to deal with discrimination
1. Deportation or detention/house arrest likely will happen. Following that, a civil war amongst the demons is just as likely happen to bring Iruma back. Iruma has far too many powerful backers at this point to let him go without a fight. And his backers absolutely should know what will happen if Iruma is given up and out of their care. Kiriwo is already set on eating Iruma (literally, not figuratively). And if Baal doesn't let Kiriwo eat Iruma, Iruma is just as likely to be experimented on and die/suffer horribly while in custody.
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2. A "peaceful" deal between 2 sides won't happen at this point - Iruma got exposed and Sullivan likely just lost all credibility amongst non-Iruma fans... unless Sullivan has a backroom pre-arrangement and/or deal with the interim demon lord or someone just as powerful (akin to how Henri pulled out Delkiras seal to override another Crown's order).
Keep in mind, even up to now,
we still don't know why Iruma was chosen by Sullivan nor how Sullivan managed to get to Iruma without any other demon leaders finding out from chapter 1. From the thief arc, we know the trip to the human world isn't some wily nilly thing even the most powerful demons can do without notice. Sullivan wanting a child/adoption is fine, but of all the people, why Iruma? And why go through such length to do so? Iruma being possibly related to Merize in someway is likely a factor as well, but if so, why was Henri not made aware of it?
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The most important person here is Henri. I can actually see Henri forcing a "compromise" to keep Iruma under his watch rather than Narnia's. From the flashback arc, we know Henri has been setting up and now has the demon patrol is split between 2 camps (his and Narnia).