iirc, it was bl office romance and there was some fate/red string type of trope and the seme was black hair, he approached mc during a drinking party BUT in another timeline mc ends up with someone else
https://www.mangago.zone/read-manga/ookami_wo_katte_imasu/
HOLY SHITTT! I CANT THANK YOU ENOUGH
all good!
iirc, it was bl office romance and there was some fate/red string type of trope and the seme was black hair, he approached mc during a drinking party BUT in another timeline mc ends up with someone else