For 1 here’s some http://www.mangago.zone/people/tag/437555/Established+Relationship/
Kuroneko Kareshi Series
Kokoro - Kanda Neko
Theraphy Game
Sayonara Game & Change World
Between the Sheets & Blue Moon (if i'm not mistaken of the title of the volume 2)
Love Nest and Love Nest 2
Love is an Illusion
Painter of the Night (at the beginning there's no steamy scene between the main couple but on the middle part, there's a lot(≧∀≦))
Tadaima, Okaeri
BL Motel
Ookami-kun was Kowakunai
Ookami-kun wa Hanasanai
Thoroughbred wa Nabikanai
Thoroughbred wa Yuruganai (ongoing)
Boku no Danna-sama
Kiraide Isasete
Kedamono Arashi Series
Boku no Omawari-san (still ongoing but it's been a long time since this was updated. Still, its a funny read)
Urisen Boy to Koisuru
Sahara no Kuro Washi
Black Eagle in the Sahara: Alkil's Story
Under my Skin (I'm not sure if there is a volume 2 cause its still ongoing and currently in chapter 6.6 but I guarantee you that this is an AWESOME read)
Oreshika Shiranai Karada (same author as Under my Skin)
These are some of my recommendations and all of them are some of my many favorites(≧∀≦), though i know there are still a lot of bl mangas out there that matches your interest. I have been reading BL for last few years ago and started again on quarantine period until now. i am currently looking for what to read since i have read so many already hahahahah
Hope you will like it.
tysm!
OMG, you gave me A LOT, thank you so much! I found a new favorite in some you recommended so appreciate it ^^
You're very much welcome. Those stories are some of my favorites and I'm so glad that you enjoyed them (⌒▽⌒)
1. Any bl manga where the mc and ml are already together or
2. bl mangas with longer stories about the main couple (more than 5-7 chapters, maybe 2 volumes?)