So we meet the more evil half of this divine au where Kalin comes in. He's a succubus that kinda just chills and fucks when he's able. He's pretty lazy and not very threatening at all. Though Noel thinks different. From the moment the two come into contact, Noel is hellbent on protecting Walt from this demon's influence (despite Kalin not doing anything lol) and in turn, Kalin pretty much indulges Noel by feeding into the paranoia. He doesn't outright do horrible shit, just kinda flirts and bluffs a lot just to get Noel to react.
It's a silly cat n mouse game where both boys aren't on the same page at all but they still figure out ways to meddle with the other. Walt on the other hand just ignores this cuz he's got weed to smoke.
This AU is very very out of character for these boys and it's great.