Dragon/Knight idea, M/M, dominant knight wanted

[Amiable]

I tried this a while ago and my partner disappeared, and now I feel like trying it again. My character is a dragon who also can take a human form. Your character is a knight, and when he defeats my character, he decides to keep him as a pet rather than kill him. I'm thinking he can use some kind of enchanted collar or something to keep him in his human form. Anyone interested?