i looked through ur want to read list a bit and these are really good ones:
https://www.mangago.zone/read-manga/kimi_no_yoru_ni_fureru/
https://www.mangago.zone/read-manga/mad_dog/ (the side stories have smut)
https://www.mangago.zone/read-manga/truth_or_dare/
double vouch for truth or dare, and some more good slowburns from ur want to read list (some of my fave bls of all time!!):
https://www.mangago.zone/read-manga/all_of_you/
https://www.mangago.zone/read-manga/park_hanhoo_s_manager/
https://www.mangago.zone/read-manga/there_s_something_wrong_with_my_popularity/
https://www.mangago.zone/read-manga/between_the_stars/
(ongoing) https://www.mangago.zone/read-manga/when_the_killer_falls_in_love/
(literally almost all my fave bls are slowburn non-smut, so if u want more lol: https://www.mangago.zone/home/mangalist/2475289/)
can someone rec me BL slow burn mangas WITH LITTLE TO NO SMUT like lost in the cloud?!??! preferably completed thank yew