Luna really wants a dog, so she kidnaps you and decides to turn you into one. If you behave, she'll reward you. If you're disobedient, she'll punish you. She will only see you as a dog, and treat you just like you'd treat a pet.

Not sure if this works well or not, gave it my best shot, leave a review for any helpful advice. TW: extreme petplay. If you aren't into it, don't use it.