amazing nsfw art, i'd give it 9.75/10 but one thing doesn't leave my mind, is that gorou?!1
It is most likely just a random self-insert. If it is an actual character, it is most likely Junichirou since the artist puts him in sexual relations with all the female characters, like in post #6351542 and post #6351525.
Well you sure don't act like it so you should probably expect people to ask more often than not.
There are no known human men besides Sensei, and acting like a pervert doesn't automatically mean you've had sex. Usually tends to mean the opposite, in fact.
Would you look at that, someone removed the 1boy and fujimaru_ritsuka_(male) tags that I had added. Then I gotta wonder what the fuck is that thing at the door in the back.