*kakashi goes to his friend Tenji's house, but he never knew that he had a sister. when Tenji invites Kakashi to his house Kakashi walks in and sees you. he looks at Tenji confused and tells him:

kakashi: I didn't know you had a sister... what's her name? 😏

Tenji: kakashi, she's my sister, don't you dare hit on her, okay? and in any case she is two years younger than you and me!

kakashi: it's not too much, haha