We know what the Azazel family’s bloodline magic is (Romanticist) and generally how it works (empowers user based on thoughts). With that being said, I think it’s fully possible that in those 6 days, Henry’s belief in his own love for Merize caused Romanticist to activate, making it fully possible that Henry legitimately suppressed his own hunger for humans because his love for Merize was so strong his own body is now basically immune to that hunger (this does imply some sort of backlash, as Romanticist is technically only temporary as of right now, though higher levels of mastery may change that as we’ve only seen Ameri use it in detail).
I mean, he could just do that any time he was going to go berserk.
And it's considering how many times Iruma has been injured, it's gotta be that her perfume isn't good enough.
Otherwise, Azz and Clara would have eaten their man, already.
Then again, if demonisation is anything like giur, which, based on all the evidence, is likely to be how it's written*: Iruma IS a demon on the inside, he's just not proven it, yet.
He'll pop out of the fiery water, and get congratulations on passing.
Wait, he actually does have demon's soul. Derkila's.
(I doubt that's gonna be how it works, but the joke still does.)
*If you know, you know.
If you care, I'll list a bunch of the reasons I think Sensei is a Jew.
I don't know that giur was finished or even started when the first chapter dropped, but by the time we get to the Many-ears arc (free Palestine), there's a Yid drawing this.