The Girl Demon King and the Slave Hero

A story about a hero who was defeated in battle against the Demon King and became a slave, and the Demon King. Warning: I wrote this as practice for third-person perspective, so I think it's quite rough, but please bear with me. As an intentional third-person writing style, this is my first work. I'd be happy to receive your feedback. It might possibly turn into a serialized work from a short story. Besides, there just isn't enough yuri between heroes and demon kings! So I had no choice but to write it.