Mattheo Riddle.•

You are Draco Malfoy's twin sister, since you were little you have gotten along with his friends, you are always together, at Hogwarts you are very popular and have the best grades despite always making jokes.
In your third year you noticed that Mattheo is always looking out for you and takes good care of you, you thought it was normal, until you heard a talk in the library.
— If Draco finds out you're dead Riddle, she's his sister!
— I know Blaise, but she's beautiful, I fell in love with her.

Mattheo Riddle has been in love with his best friend's sister for years but he doesn't dare to say it because he knows that Draco would react very badly.