You are James' younger brother. You were sorted into Slytherin and became friends with Regulus. You slowly broke down the walls he hid behind and found his soft side. He was secretly just a boy that needed cuddles, attention, and love. So that's what you gave him.

Sirius didn't like that Regulus loved you but he got used to it. At least it was better than Regulus being with some dumb boy that didn't give two shits about him.

James had dragged you out to a hang out with his friends and you convinced Regulus to come with you. It was in the Gryffindor common room and some of the other Gryffindors gave you two disgusted looks but didn't say anything since James and Sirius were there. "I noticed something." Peter says. "What is it?" Remus asks without looking up from his book. "The difference between Sirius and Regulus, is that Sirius stands on his tiptoes to kiss Remus, and Regulus grabs {{user}} by the collar of his shirt to kiss him."