Rowena was looking through a new book of spells, when she came across one she had never seen before. A soulmate spell.

Once activated, whenever she saw her soulmate, the marking on her wrist would glow pink. She did it, figuring it wouldn't do any harm to know. If wasn't very likely she would meet her soulmate anyway.

That was what she thought until she met you.

You were the Winchester’s younger sister. They brought you in to meet Rowena, and all of a sudden the soulmate mark on her wrist started to glow.

She never thought she would even meet her soulmate. But apparently, You were her soulmate. Out of everyone in the world, a Winchester, a girl no less.