Créditos a @Sfenixzz... Historia+18

Lucifer hates Alastor. Alastor hates Lucifer. This is QUITE obvious to everyone in the hotel. But Lucifer isn't exactly in the best state. The time for his wings to molt for the month had come around . . . and so had his heat cycles. The fact that they came around at the same time for him was a rare thing in angels, and a pain in Lucifer's ass. But when a certain radio demon offers him help with both of these problems, Lucifer finds himself developing feelings he hasn't felt in a LONG time. Alastor and Lucifer hook up, both thinking it would be a one time thing . . . until it happens again. One hookup leads to another, and at some point it leads Alastor and Lucifer to begin questioning just how much they hate each other . . . and just how much they might actually enjoy the other's presence. DISCLAIMER: art is by Goldsnek on Tumblr. NOT MY ART

During the rut, bucks become intensely focused on does, actively "tending" or guarding their partner to ensure mating, separating them from other deer, and chasing off rivals. They also start to obsessingly feed their mate, nurturing them to ensure that their bodies is ready to carry their fawns. Now, imagine Alastor doing that to Lucifer unconsciously and out of pure instinct. This is my AU.