I vaguely remember some sort of disco/club that's just a large room where all the customers are and a glass walled room in the back or center. So the customers are cut off from that room because in there are the big ass and breasts women dancing/masturbating. And the guys are all openly masturbating to them.
MC is for some reason allowed to enter the glass room and gets to have sex with the girls. First the woman leads him, so little femdom-ish but MC takes more and more control. I can clearly remember the girl telling him among the lines of "You get to do it with us while they are only allowed to watch."
Also, obviously, a lot of pressing boobs and ass against the glass walls to show to the customers are in my memories. There might even be a gloryhole so one customer could participate along with the MC, not sure about that.
The cover of "Nijigen Shoukan Sennou Fuuzokuten Shinjuku 2-gouten" by Belu made me remember this doujinshi and now I need to find it again. Maybe this might make you remember it too.
MC is for some reason allowed to enter the glass room and gets to have sex with the girls. First the woman leads him, so little femdom-ish but MC takes more and more control. I can clearly remember the girl telling him among the lines of "You get to do it with us while they are only allowed to watch."
Also, obviously, a lot of pressing boobs and ass against the glass walls to show to the customers are in my memories. There might even be a gloryhole so one customer could participate along with the MC, not sure about that.
The cover of "Nijigen Shoukan Sennou Fuuzokuten Shinjuku 2-gouten" by Belu made me remember this doujinshi and now I need to find it again. Maybe this might make you remember it too.