Brint slander is weird as fuck tho because most of the characters he fucks are either never commits to a single relationship to begin with OR was chosen specifically by you. Bro is a legit homie most of the timeBrint only bangs the girls you bang if you aren't in a monogamous relationship with said girls, like Cait specifically. Hell you can even invite Cait to a Threesome with him and get to choose who gets her mouth. Brint's a bro.
PS(maybe wrong since its been so long i picked Brienne route): You can even turn him into a monogamous cowgal. It really take a man to become best girl