Tennis Yaoi where uke hates seme because seme is better but seme is in love with uke?
Not exactly tennis but...
http://www.mangago.me/read-manga/aisaretaino/
Any yuri manga that’s more smut focused?
http://www.mangago.me/read-manga/i_fell_in_love_for_the_first_time/ (not strongly recommended)
Do you guys remember a Yaoi where there were these rivals and to get them to stop fighting or something, some girls suggest that the uke should try and act attractive to the seme so that he would get grossed out. However, it backfires, if you know what I mean
http://www.mangago.me/read-manga/sailor_danshi/tr/97949/page/55/
Hopefully it's this one

There was this isekai bl where a normal man gets transported to a fantasy world and told he was a demon and the prince is in love with him. The uke ends up with really long hair in the fantasy world and is buff? Can’t find it anywhere lol
it reminds me of https://www.mangago.me/read-manga/i_was_reborn_as_his_highness_the_prince_s_little_evil_dragon_shonen_ai/ but the uke is a dragon not a demon
https://www.mangago.me/read-manga/demon_confinement/
?
Tysm