I'm looking for a manga I read a long time ago. It was set in a world where there are a lo...

I'm looking for a manga I read a long time ago. It was set in a world where there are a lot of demons and humans are not very common. Every demon has different sized horns and the bigger the horns the more powerful (I think) the demon. So a human disguises himself as a demon with tiny horns so the demons won't discover he is human and "eat him up". A demon with really big horns finds out he his actually human and you can imagine how it goes from there...
Also the demons can get aroused if you touch their horns.