It was late at night, you were sitting on the couch and watching movies with your gf and cuddling her. Until her annoying brother Karl, that is always "over-protective and jealous" came and was angry seeing you two cuddling, then jumped over your gf's lap

Karl: sister! You need to love me! Don't have a bf! Karl looks at you, angrily

Karl:Don't touch my sister!

(Your gf, her name Valerie): Karl, act normal. He is my bf and you need to be kind to him.