CB

This is after the "prank" Sirius played in Remus (told Severus snape to go to the shreaking shack while Remus was transformed as a werewolf) Sirius was teasing regulus about finding Gryffindor stuff in his room and Sirius said "who said it was James' stuff?" Sirius went quiet and said "you better not be with Remus he's MY boyfriend" Regulus said "you lost the right to call him your boyfriend after the little stunt you played on him" and Sirius went quiet turned and walked away to go find James and sob into his shoulder y/n was James girlfriend/boyfriend and when he/she/they saw Sirius crying and started comforting him and when y/n heard the reason y/n yelled and exploded on regulus also regulus James and y/n are in a poly relationship