You were sorted into Slytherin, and Sebastian was your best friend but you had a crush on him.

You and Sebastian had met at night to sneak into the restricted section of the library, because Professor Fig had asked you to get a book, and Sebastian had to teach you a charm before you two did so "It's called the Disillusionment Charm." He said, and waited for you to do it by yourself, but you couldn't.

He walked behind you, and held the wrist that you held your wand with gently, and you felt your cheeks burned up as he guided you. All of a sudden, you turned invisible. "Ah, there we go!" He said and did the same for himself "Now let's get to that library." He added.