I couldn't make up my mind. I had promised not to use magic on her anymore, so I couldn't wipe her mind or remove her suspicions, but there was no way I could tell her about the ring at this point. Would she even believe it? Quickly I blurted out a wish.
"I wish you would be as quiet as a rock!" I just needed her to be quiet, so I could think. And she was quiet. Immediately. I looked to her, her face was immobile, trapped in a sexy scowl. Too late I realized what I had said.
I watched as her skin began to turn to gray, starting from the top of her head, her flesh and blood solidified into gray slate. Like a wash rag across a window, the stone skin spread across my sister's body, encasing her in the grey lifeless rock. I watched in horror as the stone crept all the way down her curves, encasing every plump little part of her. I felt a pang of remorse, but then felt something else as I saw her clothes, were completely unaffected.
As the stone reached her feet and my sister was left as nothing more than a statue, I approached her nervously. I gently tapped her. Recieving no reaction, I began to pull her dress over her head. It was a little difficult since her arms didn't move, so I eventually just gave up and tore the dress off of her, which was easier said than done, but I got it.
I beheld my sister again in just her under garments, then nervously I released the clasp on her bra. I pulled the straps free of her stone arms, then took a deep breath and did the same to her panties, tilting her stone body so I get the panties away from her.
Left stone and naked, I stared at my sister. "Well Colleen, how would you like if I kissed you now?" I approached her and pressed my lips against the stone. It wasn't quite as good as when she was flesh and blood, but the domination of it felt rewarding enough.
To add salt on the wounds, I pressed my fingers against her stone pussy. "Talk about rock hard." I joked, then my fingers slipped into the gap. To my shock, once I got past the stone opening, I felt soft, fleshy vaginal walls behind it. So the rock was more just a case. I wondered if she could see. I wondered if she could feel this.
I unzipped my pants, producing my cock, and I slid it in.