Reincarnated, reincarnated, and reincarnated again for revenge [BL, H]

The moment XX-kun life ended on earth, he was reincarnated as a non-human in a fantasy setting world. Still in this world, human and non-human lived together in harmony. This harmony was shattered by an existence of a "demon emperor." Like any fantasy game goes, the demon emperor was finally defeated by XX-kun and his party... yet, afterward, he was killed... His second reincarnation was into the same world but way into the future.... but, he was reincarnated as a monster being experimented on in a laboratory. One of the experiment went wrong, thus his life ended. The third reincarnation, he again was born as a hybrid monster, half incubus, half ogre in a monster village. Everything seemed to go well until the village was attacked... WARNING: EXPLICIT YAOI, HENTAI, HAREM.