Ancient monsters

Two of my characters. Those two are a fox and a oni that lived in ancient Japan.
The blonde one (the oni) is actually a boy. He was born as a human but because of his blonde hair and womanly features he was given to the oni who was attacking the village as a sacrifice. He became the oni's servant, who made him dress in women's kimono and cast a spell on him so that he may not age and keep the beauty in which the oni was so interested. 
One day, the fox had nothing better to do, so she trespassed into the oni's territory and battled him. She won, killed the oni and took everything he had, including the boy. He was then made to become the fox's servant, but the spell of the oni had a side effect... the moment he left to follow his new master, he turned into a oni himself. 

Their names are Chiyoko and Kiyoshi.