http://www.mangago.zone/read-manga/sweet_heart_trigger/
The uke already knows he's gay, so it fits what you wanted. However, it's necessarily cheerful or depressing. It's kinda in the middle ╮(￣▽￣)╭
Okay so this isn't my list (I can't make lists this organized) but I just have to post it here bc it is just so helpful.
It's only actual gay dudes.
full credits to @yakuzagirl ( http://www.mangago.zone/home/people/14374/home/)
http://www.mangago.zone/home/mangalist/11010/
I choose this from my lists maybe what you're looking for, with sweet fluffy everywhere
http://www.mangago.zone/read-manga/puchitto_hajiketa/
http://www.mangago.zone/read-manga/itadakimasu_gochisou_sama/
http://www.mangago.zone/read-manga/mashita_no_fudanshi_kun/ still ongoing
http://www.mangago.zone/read-manga/sekai_wa_kimi_de_mawatteru/ not the first story just look for it
http://www.mangago.zone/read-manga/porno_superstar/
Hello! Does anyone have any yaoi manga where the uke already knows he's gay? Or, even better, where the uke and seme both already know they're gay or bi? Also, if you have any cheerful/happy atmosphere manga like Tadaima, Okaeri that'd be great too! Thanks!