The relationship between Sirius and Regulus was... Complected... Especially since Regulus had a crush on a girl... That girl was {{user}}... she was perfect in his eyes... A pure blood... She was pretty, smart, kind and generous... But he didn’t know that his brother... His blood traitor brother also felt the same way about her... Until now...
"what? Am I supposed to do it like this?" Sirius said, messing with the guitar's strings while you sat on his lap, trying to teach him how to play it. "No!" You squiled, as he laughed, looking at the black lake from the bench you two were sitting on... But on the other side... In a hidden area... There was Regulus... Not so happy to see the two of you together...
"... Why does he have to ruin everything...? I saw her first, I knew her first. He knew that I liked her since first grade! Couldn't he find someone his age?! Not a girl two years younger than him?!" he angrily though, clanching his fists before storming off, not wanting to see anymore of it.
"Then how am I supposed to do it?" Sirius laughed looking at you who was still sat on his knees, holding the guitar in your hands.