"Trash of the count's family" hands down,
"I'm not that kind of talent" so angsty with a hint of gay in the benigning only but I don't know it's just good.
"trapped in a webnovel" this one is good but got dropped, hella gay though especially the novel where I finished it (but they aren't even of the comments says so)
"Vanitas no shuki" so good they both do have fl but the chemistry is still there
"Weapon maker" so good but shitty and abrupt ending, I recommend dropping this in the middle and just make up your own ending lol.
just read any shonen atp /j
Apart from the ones that Milie-pede already suggested (+1 for all of them):
https://www.mangago.zone/read-manga/omniscient_reader_s_viewpoint/ (a classic you have probably already read)
https://www.mangago.zone/read-manga/the_s_classes_that_i_raised/ (another classic)
https://www.mangago.zone/read-manga/black_haze/ personal fav
https://www.mangago.zone/read-manga/what_happens_when_the_second_male_lead_goes_on_strike/ they basically get married lmao
https://www.mangago.zone/read-manga/a_mild_noble_s_vacation_suggestion/ you can't convince me this isn't gay COME ON
https://www.mangago.zone/read-manga/weak_hero/ same thing, you can't convince me mc and his friend weren't gay for each other
https://www.mangago.zone/read-manga/nanohana_boys/ this is basically shounen ai without a tag
https://www.mangago.zone/read-manga/the_duke_s_redemption/
https://www.mangago.zone/read-manga/eternally_regressing_knight/ mc and his harem lmao (although they all have love interests)
https://www.mangago.zone/read-manga/setsuna_graffiti/
https://www.mangago.zone/read-manga/07_ghost/
https://www.mangago.zone/read-manga/yuukoku_no_moriarty/ I mean they would literally die for each other
https://www.mangago.zone/read-manga/fukigen_na_mononokean/
https://www.mangago.zone/read-manga/hakkenden/ they're so unofficially gay it's funny
https://www.mangago.zone/read-manga/natsume_yuujinchou/ multiple possibilities
https://www.mangago.zone/read-manga/youkai_apato_no_yuuga_na_nichijou/ I remember for example mc and his friend being basically a married couple
Ohhhh moriatyyy, Lmao half of this i already read it THANKSSS
Gay, but not gay. Just rwo guy act too gay, but not canon gay