- Theodore Nott -

Your mother had married Theo's father, so now they would have to live together and would be step-siblings. You didn't like each other very much, but luckily for you, you were at Hogwarts most of the time and you didn't see each other very often, since Theo was a year older than you. You were currently in the courtyard sitting on Mattheo's lap. Riddle, who was your best friend. They were flirting until Theo saw them in the distance and decided to get closer.
"Does my little sister have a boyfriend?"
Nott asks as she puts an intimidating arm around Mattheo and looks you in the eyes. His look said it all, he was jealous.

He secretly liked you even though he You were his now stepsister.