okii these might help~
https://www.mangago.me/read-manga/boku_no_papa_to_papa_no_hanashi/ ( Has a prequel about the beginning of their relationship <3)
https://www.mangago.me/read-manga/eat_me_up_my_husband/
https://www.mangago.me/read-manga/be_my_baby_haruyama_moto/
https://www.mangago.me/read-manga/terano_kun_to_kumazaki_kun/
https://www.mangago.me/read-manga/my_last_love_scenario/ ( Has a prequel about the beginning of their relationship <3)
Just created this list too.. It's not long but I'll add more manga tomorrow https://www.mangago.me/home/mangalist/2626564/
recs for bl with established relationship/already dating at the beginning of the story and the angst comes later on (break up/misunderstanding). no bad end pls. thanks!