Responses
I didn't finish reading your description since I got excited, I'M SURE ITS THIS ONE! (The story you are saying is one of the last pairings aired, you won't find it from the beginning)
https://www.mangago.me/read-manga/you_who_wants_to_love/

Hi uh, first time asking a question LMAO. Could someone help me find a bl omegaverse where the people have animal characteristics and there was both a main ship and a side ship, and the story continued with their kids too. Uhm I don't remember the first pairing, but the other one was... A lion and a mouse I think? And they had two twin mice kids who were suuuper popular idols I think and fell in love with this catboy that had a kink in his tail, who sent them letters when he was a kid in an orphanage. I know that there was also a pairing with the kids of the main couple that I don't remember where their son was in love with an older bear guy who was a huge sweetie.