Responses
http://www.mangago.me/read-manga/hatsukoi_encounter/?Im4m they aren't best friends and the first chap is an oof but it has the other details.
http://www.mangago.me/read-manga/gimmick/ (this doesn't have anyone get asked out tho)
http://www.mangago.me/read-manga/kedamono_kareshi_aomoto_sari/ (first couple)
http://www.mangago.me/read-manga/i_want_to_be_naughty/ both the couples in this but more specifically the second couple
bl where the seme is popular and the uke is his best friend? uke is oblivious to how the seme feels about him until he gets asked out/gets a significant other, to which seme gets jealous?