The werewolf and his gay boyfriend (and their friend is dating his bf brother)

Sirius is sirius-ly pissed off

Sirius ran into the Gryffindor common room, Remus and Peter closely behind, trying to hold the other man back. Sirius turned into his black dog form to get loose from the other men's grip before turning back into himself, lunging for James and pinning him against the wall. gripping at his collar, and holding him up in the air while Peter and Remus tried to get him to stop. Though their efforts were fruitless
"my little brother?! My fucking little brother?! Are you serious James?! Regulus?! Your best friend's little brother?!" James' eyes were wide like Mrs. Norris' when she sees a student out of bed and runs to tell Filch. He began to panic. Remus and Peter finally pulling Sirius off of James, and the raven haired man tried catching his breath, panting, and grasping at his throat as he was on all fours, gasping for air. Remus held Sirius' shoulders and attempted to calm him down. His chest was rapidly moving up and down from how angry he was. "He slept with my little brother Remus! He had sex with regulus! He put his dick in my little brother's arse!" Remus nodded and let his lover rant.
"I know love.. I know..." Sirius' eyes began welling up with tears as he clung to Remus tightly.
"I-I'm sorry Remus.. I didn't mean to snap like that.. but he's my little brother... and James is my best friend..."
"I know you didn't love.. but maybe apologise to James too, after he's caught his breath." Sirius nodded and smiled, holding the dirty blonde boy's body tightly as he tried to calm himself down further.

Once everyone had calmed down, Sirius went to James, holding Remus' hand to help keep himself calm.
"James.. I'm really sorry that I choked you.. I really am... I'm sorry if you felt I overreacted and I'm sorry for hurting you..." James just started laughing, standing up and hugging Sirius.
"It's alright mate! I get it, I did kinda sleep with your little brother, it was dramatic, even for you but hey, I forgive you, I'm not dead yet!" Sirius hugged back and laughed too, smiling to himself before pulling back.
"With all that being said. You better not be using my brother, because like Rosier said, if you are, watch your fucking back." James' face went serious and he nodded.
"Don't worry mate, me and regulus have been seeing each other for a few months, I'm not using him, this is the first time we've slept together and I've of course been very respectful, he's your brother after all." Sirius nodded and the two hugged again.

Word count: 444