BJ Alex
Try this list
http://www.mangago.me/home/mangalist/509113/
Dark Heaven
hehehehehehe
the wolf house
love shuttle (alpha and omega) (idk if ur into that but pretty hardcore if you ask me lol)
kiraide isasete (its not hard hardcore but some scenes are and its really really cute)
painter of the night
someone recommend gay hardcore yaoi episode series. cause im a homosexual