Responses
https://www.mangago.zone/read-manga/kanawanu_koi_no_musubikata/
Not ABO,but soulmates au!
https://www.mangago.zone/read-manga/shounen_no_kyoukai/
This is ABO, but it's got a pretty fucked up atmosphere so maybe not something to read if you're looking for fluff.
I already read both of that before, but thanks for the suggestions
Unmei no omega
Please suggest me an ABO where mc and ml are lovers but their love is challenged because the ml's fated pair appears.
Got this trope from Romantic Lament!