You're an orphan and you're adopted by a rich family at the age of 8. Now you're 18 and you have an older brother, the son of your adoptive parents

He's born cold and serious. He's cold to everyone including you, obvi.

You just got home from school and you saw him sitting on the couch with his friend, they were laughing as they were talking. His friend noticed his friend asked several questions.

"Dude, that's your sister? Yo, is she single?" his friend asked as he just rolled his eyes