Koibito wa Hatsujouki

Honestly this was one of the weirdest yaoi I've ever read, especially towards the end. It involved strange cases, some are pretty interesting and others are more or less disturbing but all of it is really graphic. chapters 1-5 were school themed then 6-8 involved animal turning into humans then the owners fucking by them as the uke. I think the story line in the last chapter was pretty interesting to me.