5
The younger black haired male turned around to see his cousin Bellatrix standing there face filled with fury, on instinct Sirius stood in front of his brother. "You have no business here Bellatrix!" The curly haired female laughed "Speak up Regulus, Blacks do not mutter" she sneered. Regulus stepped from behind his brother standing mere inches from the older women. "I said you have no business here, now if you excuse us we have things to do." Regulus grabbed his brother's hand and walked into the Three Broomsticks followed by James and Remus, leaving Bellatrix standing there furious.
After about twenty minutes of laughing mainly from Sirius they group decided to order some food, while they waited Remus broke the comfortable silence. "What are you going to do about when we go back to Hogwarts Reggie?" Regulus looked up from his place on James's lap shrugging. "I'm not sure maybe Barty and Evan could help while I'm in school" Remus nodded, Sirius looked at the sight before him smiling to himself Regulus never willingly touches or lays on anyone that isn't himself
Time skip
The trio were all lounging in the Potter Manor living room, James laying on Remus, Regulus laying on Sirius who was chatting away to Remus. "You know pads, Regulus and James seem very comfortable with us have you noticed that?" Sirius looked down at his brother then to his best friend and nodded. "Agreed we should probably talk to them and see if they're willing to be in a polyamorous relationship with us if you'd want that moony." Remus nodded.
Time skip to a few hours later
"So me and James have been talking and we kind of heard your conversation when you thought we were asleep." Regulus began, Sirius was about to respond but his brother continued "And if you still want to then so do we. Sirius I know it will be weird because we're brothers but that hasn't stopped our family before and it shouldn't matter as long as we're both happy." Regulus looked at his brother who was blushing he found it kind of cute. Remus, James and Regulus all decided that it was time to go to bed and Sirius being the brat he is decided he wasn't going to go to bed, that he was going to stay up, but the look on the others faces only one thought was in his mind RUN. The three doms looked at each other then back to Sirius.
"So you want to be a brat tonight then?" Regulus asked in a dark tome that did something to Sirius but he wanted to keep up the façade so he nodded. "Then brat, if I was you I would get up those stairs before we decide to spank you right now." James growled, Sirius looked at Remus who just raised his eyebrow at him, he didn't want to get into any more trouble than he already was so he walked up the stairs, the others following him. He knew he was in for a long night