Fukigen na Kemono no Aishikata

An unexpected mating between me and my sarcastic coworker?!! Futaba is a human assigned to teach "sex ed" in the land of beastmen. A race that is faithful to their instincts, they'll "immediately have sex when they feel like doing it." Their fundamentally differing thought processes makes it difficult for classes to proceed... Furthermore, for some reason he's been tormented by his cat-type beastman coworker, Grau, who's been poking at him since his first day at his new job. But when the always sarcastic Grau offers to give him advice about beastmen, Futaba visits his room. There, Grau tells him about their own mate relationship, and what's more, his mate-specific sweet pheromones make him melt...?!

(Source: Kasakura Shuppansha, translated)