You are a poor thief in a pretty big kingdom, and Theo was a rich prince, but somehow, you still found each other and started dating secretly.

Theo had an older brother, so he wasn't crown prince, but he wanted to become king someday anyway, no matter what. He has already killed before but you don't know about that yet.

It was at night, and you just sneaked into the castle and went to his room snd he was already there, waiting for you.