~Regulus always wonders why he doesn't get hurt as much as Sirius, Thinking it's because he took on the more quiet and respectful persona. When in reality, it's because Sirius will take the blame or purposely act out so Regulus wont get hurt as much.
~Regulus is trans and Sirius is the only person in the family who truly accepts him. When Reg cut his hair one night, Sirius told Walburga that they did it so Regulus wouldn't get punished.
~When Regulus came out to Sirius as trans, Sirius gave Reg some of his old clothes before he had the chance to buy himself new ones.
~Sirius is gender fluid and goes by he/him they/them pronouns most of the time. When he told Regulus, Regulus gave Sirius some of his old girl clothes.
~Both Regulus and Sirius are gay.
~When Sirius and Regulus were kids, they would curl up under blankets and do their own activities, usually Regulus reading and Sirius listening to music or drawing. Not saying anything just taking comfort in each other's presents.
~Sirius was actually ok with Regulus and James dating. He was just being dramatic about it for shits and giggles. They'd rather it be someone he knows well and trusts to take care of Regulus rather it be some person he doesn't know.
~One time, Regulus got really drunk and gave Remus his blessing to marry Sirius. He's still teased about it.
~Walburga made Regulus watch Sirius being tortured.
~Walburga made Regulus use crucio on Sirius once. Regulus still hasn't forgiven himself even tho Sirius has told him repeatedly that it wasn't his fault and they forgive him.
~Regulus is haunted by the sounds of his older brothers screams.
~They both often bandage up each others injuries.
~When the other marauders found out what was actually happening, James let both Sirius and Regulus stay at his place.
~Sirius has claustrophobia (fear of small spaces) because Orion would lock him in small rooms or small wardrobes as punishment.
~Regulus has acrophobia (fear of heights) because Orion would take him to the roof of the grimmauld palace and would tell him he was gonna throw him off if he didn't do something correctly.
~They both have the habit to sneak food into their dorms/rooms, just in case.
~They both often make trauma jokes, while Remus and James are either mortified and horrified in the corner or making a plan to kill their parents, or both.
~They both flinch when someone raises their hand in front of them.
~They both cant handle when someone yells at them. Sirius will yell back or stand there, trying to hold back tears. While Regulus will shut down or reply in short responses then be like that for the rest of the day.
~Sirius is really good at drawing as he uses it as a coping mechanism. Same with playing electric and bass guitar.
~Regulus uses poetry and reading as a coping mechanism.
~They both have night terrors.
~Regulus is two inches taller then Sirius, He refuses to let Sirius hear the end of it. (Sirius being 5'5 and Regulus being 5'7)
~Regulus is very picky about his hair just like Sirius is. So sometimes, Sirius will stop Regulus in the hallway and will fix it for him then leave without a word. Regulus will then have to try and fight back tears for 5 minutes. Sirius often doesn't even realize he does it.
~They look practically identical except for hair length, height, and choice of clothing.
~They often rant together in French, James and Remus will listen to them, having no idea what their saying but in awe of how their voices sound.