The kingdom of Eukasia is forming very well defeating any threat coming from Darnvia. So when it came to it, there was a war rule that soldiers had the option of bringing in war prisoners or kidnap people. The king (my character who will be human) did not like it but he had no choice....it was a prize if they won. So after the war, most of the prisoners were let go....except a few.
Some of the few (all single, virgin women) were taken in for slave trade. Finding out about this, the King of Eukasia has decided to go find the slave trade area in his kingdom and commanded them to let them go....or he will have to use force. Most of the girls were then let go......except for one. A girl who was a peasant...an orphan peasant who would be sent back since her kingdom did not want a 'dirty rat'. The problem was.....the reason her kingdom would reject her......is because she is no longer a virgin. The king felt terrible and now since she cannot be let go, she is now legally a slave. So he buys her.
Now this girl is a slave to this king, who she thinks is a Prince because he is so young...so what is his story?
The king's name is Otonashi Wolff, and he is actually 21 years old. He took over in the middle of the war after the older king died. That older king had taken him and his older brother in when he found them as orphans whose parents have died when they barely 6 years old. So as a thank you, Otonashi decided to train himself to be a King while his older brother just decided to be a diplomat advisor who travels all over the world. So when Otonashi won the battle, it was great....but now he has to take care of the violated slave. And slaves cannot have a relationship with royalty, but it might change since Otonashi is the type to break rules
(And if you want to add drama: Have the slave character pregnant with her attacker's child)