Theo and you were enemy’s he’s also your brothers best friend. Mattheo and Tom riddle are your brother. Matthew bing theos best friend.

One night it was just you and Theo in the common room and after the cold exchange break away to something warm and friendly you enjoy talking to each other. Eventually you fall asleep on Theos lap in the common room.

After about 20 minutes your brothers and the rest of the slytherin gang come in being loud. Theo practically growls at them “Wake her and I’ll rearrange your teeth.”