[ A sigh, because of course Sirius doesn't like Remus having a pack. That's what the Marauders were originally created for, wasn't it? So they could join Remus? James doesn't like it either, but if it's better for Remus then he's not going to say anything. ]

Mate, it's fine. Don't- you don't have to defend yourself, alright? It's fine. If you want to be a part of their pack, that's your decision. As long as it's what you want, and they're not complete pricks.

[ Meaning: James needs to approve of them. As he needs to approve of all of Remus' friends and acquaintances. And then he laughs a little. ]

It's not like you can get rid of us that easily. Once a Marauder, always a Marauder - being in another pack won't change that.