I know this is mostly answered below, but I’m still gunna answer too because one of the specific endings actually spells it out. I’m gunna spoiler tag the majority of this, but you should REALLY try the paranoia poly ending (ending 7 in the little guide in game), it explains a lot to do with Levon. It DOES involve death but
Spoiler warning
the dead are brought back to life. Personally, because of how the ending explains that Levon is a demon and expands on the terms of being a demon, I like to choose the X memory and then biting Levon. Below im just gunna type out what the ending explicitly says/is so close this if you dont want to read it:
Levon kills X during the fight by snapping his neck, and the MC (subdued) kills Levon by accident on instinct. After MC slaughters the guests and staff in a fit of despair, Levon appears to them again alive, with his demon features showing. The dialogue explains that Levon made a pact with a demon. His patron wants souls and he has to eat hearts to survive. (Very ironic considering he is mentioned in another ending to not like eating meat). Levon collects the blood from his guests for the MC, as his blood can no longer sustain a vampire due to not being human blood (was hinted at when you bite Levon). Levon explains after this that he only became a demon to be immortal, together with the MC forever. The MC bullies Levon into performing a demonic rite for X. I recommend saving at the POV screen there, because Levon’s POV and X’s POV are both insightful. In X’s POV, we get a scene of X waking up and being talked at by a demon. He’s not interested in listening until the demon makes it clear he could accept a contract and be with the MC again. Levon’s POV reveals that despite having done this before, he doesn’t really have a full understanding of it. His attempts to fuck up the ritual don’t work. Lev only knows as much as he himself has experienced. X appears to them as a demon, absolutely giddy to be back. MC forces Levon to apologize and the boys start trying to kill each other with their demon tails. They banter mostly towards the end of it, we get some verification that demons are incredibly resilient.
It’s my first or second favorite ending honestly, partially for the implications but also because it shows how absolutely whipped the boys are for the MC.