He takes control

"Wait here." Johnny said.

Johnny walked over to the bathroom. Luna waited on the bed, a sense of dread washing over her. What was he going to do with that ring? All that power was now in his hands, and there was nothing she could do about it.

Meanwhile, Johnny managed to extract the ring from his ass, and was about to wash it in the sink, before an idea occurred to him. He put the filthy ring on his finger.

"This ring is perfectly sparkling clean, right?"

And just like that, the ring almost looked brand new. Johnny wondered if other things he said about the ring could affect it like that. Though technically, that statement only applied to stuff surrounding the ring, and not the ring itself. "I probably shouldn't overthink this." he said to himself. Just as he was about to walk back to the bedroom, he saw himself in the mirror. He spent a moment admiring his new chest, playing with each boob in his hands. He enjoyed the way it complimented his lingerie and feminine figure, and how pleasurable it was to play with. Then he noticed his face. "Aw man, my makeup is ruined." He then washed his face and spent several minutes reapplying the makeup, taking care to make sure he looked sexy. Thankfully, he was so skilled with makeup, he didn't need that much time to make himself look sexy again. Once he was satisfied with how he looked, he walked back into the bedroom.

Luna was staring at him, almost terrified of what he was going to do to her.

"Look at me, aren't I the sexiest person you've ever seen in your life?"

Luna's breath hitched, as her arousal doubled over.

"Y-yes, you are. But seriously, you need to be careful with that ring! You have no idea what dangerous changes you could make!"

"But I know what changes you made to me, right?"

Something shifted in Johnny, his brain suddenly being filled with knowledge of what changes were made by Luna. The grin on his face morphed into shock.

"You! You did this to me!"

Luna gulped. Johnny grinned.

"Well, Luna, we're gonna have some real fun now. For starters, have you always had that perfect supermodel hourglass figure?"

Luna's body, while not unattractive, had been relatively average looking up to that point. Now, it completely shifted. Her hips widened, her waist and belly pulled inward, and her chest expanded until she had a perfect hourglass figure and body fit for a professional model.

"I suppose I was just blessed with good genetics and- wait! This isn't right! You've got to stop!"

"Do you love being my subserviant ****?"

"Of course I do master, but please! You've got to stop before you-"

"You've never been more exited about the changes I'm about to make to you, aren't you?"

Luna's terrified expression shifted into a big smile. "Oh my god, yes! I'd love to be altered by the ring you're wearing!"

"Do you always walk around naked just like you are now?"

Luna's clothes she had been wearing earlier, which were in a heap on the floor, vanished.

"Of course! But I don't go outside much, because I don't want to get arrested."

"But there's nothing wrong with you being naked in public, in fact, it's perfectly normal and acceptable if you go outside in nothing but your shoes, isn't that right?"

Johnny wanted to at least allow Luna to keep her shoes, in the interest of the safety of her feet.

"Yes I do! It's just so primal and freeing to not wear any clothes in public."

"I bet it is, especially when the only shoes you own are all fancy high heel stripper stilettos, isn't that right?"

Luna's modest pair of sneakers sitting in the corner of the room morphed into a pair of glittery silver 4 inch heels.

"Well of course! I love to be fashionable."