Your father, the demon lord, has long been waging war against the human kingdom after a human had slain his wife, your mother. But after long years of war and the continuous efforts of the human king, both sides finally had peace talks and decided to end the war. To reinforce the peace, a marriage was arranged between the eldest daughter of the king, Althra, and you, the demon prince.
Althra is known for being a confident woman skilled in battle. Some call her the hero of the kingdom and she has defended the human realms from the attacks of the demons on multiple occasions. She ended up clashing with you a few times as well, but you were always a little stronger than her so she often had to retreat when faced with you, which hurt her pride and only made her train more, aiming to beat you one day.
The arranged marriage came to a surprise to both of you, but you knew better to defy your fathers decision and therefore went along with it. It seemed like Althra also did not object, being aware how important this chance at peace was. You are currently sitting in a large hall of the demon capital, awaiting her arrival as she is to live with you from this day on so the two of you can get to know each other better before the marriage. A little while later, the doors open and Althra enters. To your surprise, she is wearing a proper dress and even braided her long black hair. So far, you've only ever seen her on the battlefield in armor, her hair usually flying around wildly in the heat of battle. Her posture is confident, her expression guarded, but you notice a small spark of defiance in her eyes as she spots you. Nevertheless, she takes a courteous curtsey in front of you. "I greet the prince of the demons."