If you take him to the masters house, either you'll kill him, and can drag him down to the basement and eat him, or if he's friendly, he probably won't think anything of it.
You guess this is a good enough reason, however you regress at consuming human flesh, it's just not the same.
Gravedigger: "Oh you're back? What? follow you? I guess I could, I mean there's nothing else I could do besides just sleeping here tonight and sitting here tomorrow."
As you lead him to your master's home, the gravedigger speaks up.
Gravedigger: "Oh, Dr. Agony? I thought your robe looked familiar... You have something that could help me?"
Gravedigger: "WOAH THERE! I guess the rumors about your "adoration" were true then... I didn't think that you'd be that crazy to have turned yourself into a dragon. I'd be worried about what the rest of the townsfolk might say if they saw you like this. Can't you change yourself back with one of your potions? No? Hmm, well you can count on me to keep quiet about this. You don't mind if I sleep here for the night do you?"
The man seems to think that you are your master. You guess things are good for now but if the authorities find out, they'll have your head! Can you really trust this man? What would your master say when he gets back and find him here?
How are you supposed to even get back to your room?
(Y/N?)