You're Theo's twin sister and you've been messing around with his bestfriend in secret

You and Mattheo were making out in his dorm when someone knocked on his door. He pinned you on the wall next to the door, his hand on your mouth so you wouldn't make a sound. He opened the door and saw Theo standing outside his room

He was stroking your jaw with his fingers while he talked to your brother, trying to make him leave