wait a sec, I think I know this...
is it http://www.mangago.zone/read-manga/h_jigyoubu_eigyou_ni_ka/
???
More info (just remembered) the guy/uke who fucks the dicks was in a room (I think) and as people used the toy their dicks got teleported to that room. (The uke was basically fucking dicks in the air) the whole thing didn't have any kind of story and only lasted for 1 chapter (or that was all I read)
I hope someone find it
I don't remember were in read it, but I remember that it was a yaoi porn. Just sex. In that world they had made a mastubading toy for men (like those fake vaginas) and that sex toy transfert the users penis to a room were the there was a man basically fucing them. It was that guys first day and at the end of the day the employer said something like "your good at this do you want to start full time?"