"She's mine" (Marco x Reader x Tom)

You turned his world upsidown, You showed him light in the darkness. He could have had you all to himself, until the demon wanted another dance with his princess~

In this story, You play the role of (Y/N) Butterfly, future queen of Mewni! Unfortunately thanks to your mishaps with your new wand, you won't be staying on mewni for a while. But thankfully, instead of being sent to St Olga's reformed school for wayward princesses, your parents found a different location for you to train; Earth.
But training wasn't the only thing you'd be experiencing. Little did you know that you'd be making a decision that would affect you for the rest of your life. And a certain misunderstood bad boy and a new and improved ex with horns would both have their eye on you with a want to be more then just friends.

[ALL CHARACTERS IN THIS ARE CREDITED TO THE CREATOR OF SVTFOE]
[I do not own any of the art used in this story unless I state otherwise]