Hi! Here you go
Childhood Friends:
http://www.mangago.zone/read-manga/gunjou_no_subete/
http://www.mangago.zone/read-manga/itsuka_tomodachi_ja_nakunaru_to_shite_mo/
http://www.mangago.zone/read-manga/tamayura_yuki_ringo/
http://www.mangago.zone/read-manga/sono_suki_honto/
http://www.mangago.zone/read-manga/itsuka_koi_ni_naru_made/
http://www.mangago.zone/read-manga/bokura_no_tsuzuki/
http://www.mangago.zone/read-manga/shinyuu_tte_soko_made_shinakucha_ikenai_no/
http://www.mangago.zone/read-manga/my_childhood_friend_was_a_god/
http://www.mangago.zone/read-manga/see_you_later_mermaid/
http://www.mangago.zone/read-manga/bukiyo_na_bokura_no_sukima/
http://www.mangago.zone/read-manga/dekoboko_sugar_days/
http://www.mangago.zone/read-manga/dear_signal/
http://www.mangago.zone/read-manga/houtou_musuko_to_koi_no_ana/
http://www.mangago.zone/read-manga/soshite_mata_kiss_wo_shite/
http://www.mangago.zone/read-manga/jikyuu_jisoku_de_nani_ga_warui/
http://www.mangago.zone/read-manga/kitto_kiss_o_suru_toki/
http://www.mangago.zone/read-manga/chihira_kun_wa_maryoku_ga_tarinai/
http://www.mangago.zone/read-manga/tada_omoukoto_wa/
http://www.mangago.zone/read-manga/sayonara_game_minaduki_yuu/
http://www.mangago.zone/read-manga/ore_no_itoshi_no_neet_kun/
These stories are relative to their age btw! Hope you enjoy!
can you guys plzzz recommend BL manga witb childhood best friends and the seme is posessive with the uke