"I want to see what it's like to have sex with a man who is half human and half animal."
"What animal?," I asked.
"Hmm... something stong, and handsome... I know, a horse."
I grinned a little, she had a good imagination, this would be a fun night. Before I changed myself I decided to make a little safety feature, I wished to always be all-powerful, ring or not, and nothing could ever take it away. That taken care of, I was ready to change forms. I wished to become an anthropomorphic horse.
I looked in my mirror and watched my head and neck turned completely into those of a horse, My legs grew longer and took on more muscle, as did my arms, my torso became more toned and short grey fur grew out of my body, I felt something push in my back and a tail grew out right over my rear. And then, I watched as my already huge cock grew even larger, it became smoother and mottled grey, then was enveloped by a sheath of grey fur, my change was comple, I looked at Christina and she looked up at me with wide eyes, a fantasy about to come true.
I moved down to the end of the bed and straddled her legs, walking on my knees up the bed toward her upper half, when I reached the proper point I stuck my muzzle down between her now-huge breasts and nuzzled her for a moment, then I rammed in full force, my legs were even stronger than I expected and she cried in pain as my too-large cock tried to force it's way into her vagina. I quickly wished for her vagina to automatically expand or contract to fit perfectly with any penis, and she loosened a little around the tip of my hard horse cock.
I reared back again and this time rammed all the way in to her, burying my cock within her magically extended vagina, much deeper than should be possible, and she was still tight enough to give maximum pleasure. And as I slowly started to pump in and out she joined in, timing thrusts to coincide with mine, sensual waves flowed over my body and I fondled her huge tits while I prepared for release. She tightened up and came right as I did, blowing a huge horse-load into her. And I sat there for a few moments basking in pleasure. "What's Next?" I asked, and she said, "That was amazing, but what if...