The uke and seme are friends in college, the uke has a round and girl-ish butt but doesn't like it. The seme touches and teases his butt .
Hi! Is it this one?
http://www.mangago.zone/read-manga/shiri_fechi_nanka_ni_sukarete_tamaru_ka/
Thanks a lot to whoever translated and uploaded tgis here. <3