i think mc is just playing with the ml at first. him and the twink (I'm sorry I forgot what his name is) are just fwb that already know what the other is like. so it's a relationship but not a romantic one? he could care less about who the twink fuck, he's just interested in the black haired guy
So is the MC in love with the slut? Why is he going through all these shits just to protect him?