Hey there (●'◡'●)ノ
These are some yaoi mangas I've read, where they both first started out straight:
-Furueru Yoru no Himitsugoto
-Sugar Code
-Kiraboshi Dial
-No Color
-Free Punch
-Doushiyoumo Nai Keredo
-Dash!
-Recipe No Oujisama
-Gosan no Heart
-Rutta To Kodama
-Ameiro Paradox
-Kono Ore Ga Omae Nanka Suki Na Wakenai
-Junketsu Drop
-Ten Count
-Heart no Kakurega
-Katekyo!
-Nar Kiss
-Ren'ai Shinan!
and take a look at my list "sweet yaoi"
http://www.mangago.zone/home/mangalist/6210/?filter=&page=1
Hope I could help you
See ya ( ╹ω╹)ノ~
http://www.mangago.zone/read-manga/koi_wa_ichiya_ni_shite_narazu/
http://www.mangago.zone/read-manga/hachimitsu_darling/
http://www.mangago.zone/read-manga/dou_imo_nara_nai/
http://www.mangago.zone/read-manga/momoiro_junjou_danshi/
http://www.mangago.zone/read-manga/momoiro_renai_jijou/
http://www.mangago.zone/read-manga/oyaji_hiroimashita/
http://www.mangago.zone/read-manga/okane_ga_nai/
http://www.mangago.zone/read-manga/haru_wo_daite_ita/
http://www.mangago.zone/read-manga/koi_wa_keiyaku_no_atode/
one of them didn`t date before but never showed any interest in guys:
http://www.mangago.zone/read-manga/uchi_no_darling_gaikokujin/
http://www.mangago.zone/read-manga/wild_darling/
http://www.mangago.zone/read-manga/love_stage/
http://www.mangago.zone/read-manga/hey_class_president/
http://www.mangago.zone/read-manga/steady_study/
http://www.mangago.zone/read-manga/dear_gentle_papa/
http://www.mangago.zone/read-manga/royal_fiance/
http://www.mangago.zone/read-manga/soredemo_kamawanai/
Any yaoi where they both first started out straight? Plz and thank you!!!! ╮( ̄▽ ̄)╭