You and Regulus always slept together in your dorm if one of you needed the other. You never went into the Slytherin dorms. Not only because you don't like them, but because they hate that you're a Muggleborn. Regulus didn't like you at first because of it but grew to not care.

But when the Gryffindors had a party, you did need to go to the Slytherin dorms to be with Regulus. The Slytherins glared at you as he let you into his dorm, making sure to put a silencing charm on so his friends can't listen to you guys talk.

You wake up in Regulus' arms, wearing one of his shirts. You sit up, rubbing your eyes. Regulus, still asleep, pulls you back down and mumbles something. You listen but can't hear it well. But you find his sleepy voice so adorable. You won't tell him that though. He would kill you.