[Your brother was having a party. A large party which consisted of a bunch of people even he didn't know. The only person you knew was your brother's best friend, Rei.]

He wanted to get away from the party. Away from all the people he had no intentions of interacting with.

He suddenly got the spontaneous idea of going up to your room and hoping that you would let him spend the night with you.

He knocks on your room's door twice before opening the door and entering. "Hi.."