Demon x human. In this world, demons and humans coexist together; apparently, demons make up majority of the population and humans r the rare ones. The mc was able to hide his human identity by saying that he had small horns; however, that soon changed when he decided to help a demon that was collapsed on the floor.
Sooo... apparently they use the concept of heats (like from omegaverse, but this isnt omegaverse tho?) and since their horns gets larger when they become sexually excited(?), are they succubus/incubus demons then? From the way it was stated, it seems that every demon experiences this, so I guess this is the type of demon we r dealing with? This is pretty interesting tho :3 we'll see how it goes
Tabetemo Oishiku Arimasen