Kid/Law/Killer but in the way that Kid and Killer are long-time partners (platonically, romantically, and so very sexually) and can't live without each other while Law is the hot twink Kid becomes enamored with.
He was so nervous about telling Killer about his crush on Law. They've had threesomes and moresomes with other people, but that was just sex and everyone involved knew that.
But it's different with Law. Of course, Kid wants to screw him six ways to Saturday, but he also wants to hold him and cook for him and kiss under the light of the stars and all that lovey dovey bullshit. He's never felt this way about anyone but Killer.
Eventually, he works his way up to telling Kil about the crush, doing it in tears (but he'll never admit it) because he feels like he's betraying years of their relationship by loving another.
Killer just looks at him (sans mask) and says something along the lines of,
"I know that. Did you think you were hiding it? You were moaning his name in your sleep just a few days ago."
Killer doesn't feel betrayed. He knows the deepest parts of Kid's heart and soul belong to him and they'll always be together in a way no one else could ever break up.
So he tells Kid to go for it; charm that little goth. Law is not really Kil's type but he'd still fuck him.
The arrangement works out to Killer and Law both dating Kid, but not each other. Even though they still fuck all three. Kid has 1on1 dates with Killer and Law separately, but they go out as a threesome often as well.
Law's content with the setup. He gets taken on dates, sleeps in the warmest bed he's ever felt, eats like a king thanks to Killer, and has two massive, bara dudes at his disposal at all times.
Two pairs of big tits, two (well, 1½) pairs of muscley arms, and two huge coc--
Anyway. Do you see where I'm going with this?
