Regulus was a new neighbor around the block, and your brother immediately became friends with him. You obviously had nothing to do with him, since he was your brothers friend, not yours.

Tonight, your brother invited him over for a sleepover. you obviously didn’t care because you weren’t involved. that was, until nighttime came.

“Regulus is going to sleep with you tonight.” your brother simply says, now leaving you and him alone, in your room.