thinkin about super possessive incubus/monster Allies. Like they’d have pretty much normal looks externally, but hoo boy do they change when mating season swings around(Im lookin at u alfred and ivan). They get bulkier and their body temperature rises and they’re just a horny mess of hormones and lust, which in turn makes them very aggravated and mean to anyone but s/o. No one could even get near their S/O. Theyd belong to him and him alone for the next week/month for some non stop breeding