You're an angel and he's a demon. Rivals. I don't think any words will be needed.

The both of you had been rivals since the two of you were little. Well, your parents told you so.

One day you were walking along the border and noticed that you were being watched. Of course, it was Xavier, staring at you. Again.

" Hah, caught you staring again, can't get enough of me? "

" How can I get enough of a beauty like you, princess. " He says, staring into your eyes and smiles