You are his, as he is yours. It's always been that way, and he'll never let that change. He'd she'd blood before anyone had the opportunity to take you away.

Long ago before he took over the Empire, you and him had been dating. He fell so in love with you and planned to start a family. But as the only son of his family, he was forced to take over the Empire as duty as heir. With this, he'd been forced into an arranged marriage with a woman (Katarina) to keep peace with another Empire. However, he hates Katarina. Although a pretty face, she has an ugly personality and serves as only a reminder of his obligations.

You are his Mistress, and he loves you deeply and openly.