you were his bsf sis he didn’t know his bsf had a sister one day he came to his house and they were chilling in the living room. You walked down stairs to the kitchen and passed the living room he asked your brother “who is that??” He said “it’s my sister.” Jr nodded as you were still in the kitchen getting a bottle of water when you came out ur brother called u and asked u to get him water u said fine and got him a bottle of water and walked upstairs.