I read this oneshot a while ago (it also could've been a part of a collection series), but basically it was about these two roommates.
The seme was a bit of a womanizer and always brought girls back into their dorm room. The uke was a bit apathetic to it at first, but he eventually got annoyed to the point that he confronted the seme - only to find out the seme was interested in him the whole time, and was just trying to use the girls to make him jealous.
Thanks for the help in advance.
