"Nooooooo!" You cry, but it's too late. She's pulled them down, and you feel your connection to the magic vanish. Then you hear her laugh.
"A man? You're a man? No, more like a boy from the look of it." Indeed, your male genitalia were back, and your dick was sticking out stiff as a rod. She snickers as she gives your length a poke, causing it to wobble, and causing a rush of pleasure to shoot through your being. "How do you like that, boy? Yes a witch's magic feels very erotic to a male. It makes it all the easier for us to enslave your lesser sex. I think you'll make a wonderful familiar. I'll turn you into an animal, increase your libido, and transform your lust energy into magic power for myself. I imagine that a boy who was however briefly a witch will make for a powerful familiar. Since you're a male I don't think we'll need torture deary, unless you're into that. I'll have you eating out of my hand before the night is done...and my pussy, of course. Oh don't make such a sad face, dear. You may be doomed to spend the rest of your life as my pet but you'll have multiple orgasms a day from now on!"
She snaps her fingers and the rest of your clothing vanishes off of your body and into her hands, and in a few moments, you're David again. Tears fill your eyes. No no no no. It wasn't supposed to be like this...
Wydia snaps again, and her own clothes vanish, leaving the voluptuous woman's womanly body on full display. In spite of yourself and your situation you can't help but stare. Her tits were almost as big as yours had been, and hips might even be wider. Her luscious lips grinned an evil but seductive grin, promising pleasures beyond your fathom.
"Ah, you like, do you? Now that's a good boy." She lifts a long and luscious leg over you and soon is straddling you on the table.
"Now, the spell I'm going to use to change you will really be quite simple, boy. You see, when you feel pleasure, my magic will enter you. When you cum, it will change you. So if you want to stay human, then do try not to orgasm, if you can. Of course, you can't. No male can resist a witch and you will be cumming numerous times tonight, but I like to see them struggle."
Her pussy was hovering over your dick now. You tried not to think of it, but your dick wanted it, wanted even to become her sex slave and live the rest of your life feeling this incredible sexual energy, even if it meant turning into an animal. You wanted to fight but you'd never been so horny in your life. She started to lower herself down...