Here.
https://www.mangago.zone/read-manga/tasogare_outfocus/
They're not childhood friends but still sweet overall
https://www.mangago.zone/read-manga/ashita_wa_docchi_da/
In this case it was uke who was straight
https://www.mangago.zone/read-manga/yasashii_pantsu_no_nugasekata/
Seme fell in love after a while but his his feelings
https://www.mangago.zone/read-manga/itsuka_koi_ni_naru_made/
I don't quite remember but I think it was this kind of storyline after all
https://www.mangago.zone/read-manga/horeta_otoko_wa_shin_yuu_de/
https://www.mangago.zone/read-manga/cosmic_boy/
https://www.mangago.zone/read-manga/reunion/
https://www.mangago.zone/read-manga/shining_summer/
A complicated story kinda but it's worth it please read it!!!
https://www.mangago.zone/read-manga/raising_a_child_and_falling_in_love/
Art style is atrocious but worth it
https://www.mangago.zone/read-manga/bad_friend/
OMG thank you
Short bl Mangas childhood friends where seme is straight but fell in love with uke something like that