The seme never felt anything except that moment when he met the uke during his childhood and the uke pissed in his pants and he got embarrassed then the seme thought it was cute and they have always been together since then
Probably not but sounds similar to this?? http://www.mangago.me/read-manga/love_stage/
It can also be this, lolol guess he must like watersport huh.
http://www.mangago.me/read-manga/akuma_chan_wa_momoiro/

uke is in an idol group of 3. he loves to ship his 2 other members together and even bought doujinshi of them. one day he got caught reading a dj of them and they confessed their love to him.
the one as the uke in the dj was livid to find he was the uke so he ‘proves’ to the uke he’s not the same as the one uke was reading about
It's a shounen ai, right?
Oshi Couple ni Aisarete Kaishaku Chigai desu!!
it's on another site, I tried sending you the link, but it wouldn't let me