That you "help" him with his transformation magic (rule 63)

"I wanna train my transformation magic, could you help? I just need you to check if I got everything right"

You agree, curious to see demon magic in action and relieved that he's at least gonna stop teasing you. And he does, at first, transforming into some public figures from memory while you correct him based on pictures or drawings. Not that he makes many mistakes for you to correct, he's nearly indistinguishable from the original

"I think I wanna try coming up with a new disguise on the spot this time. Then you tell me if you can find anything out of the ordinary about it, allright?". You not a yes, and then Faust changes into the hotest woman you'v ever seen

She (well, he) gives you a sweet smile as you stare a bit longer than a holy men should. "I see I a did a good job, but I'm not gonna be satisfied until you make shure I got every last bit right...". She grabs your wrists and pulls your hands close to her voluptious body.

[To be continued]