"Frankly", he says, "I'm in need of some help around the house. I've got spells for all kinds of stuff, and I can summon creatures large and small, but they're not very practical at...finer human business. So I'm gonna leave you human, with some modifications, though I'll make sure you'll be a good servant all the same. While this situation may not please you too much, your duties shouldn't be too hard. Then again, you shouldn't be trying to pull tricks on me if you don't like unpleasant situations. Now then..." He seems to be preparing a gender transformation spell, but there's something extra he's added to it. You'll notice quickly enough what it is, you figure.
As the spell hits you, you can feel the expected softening of your muscled look, becoming a bit smaller and soft skinned. Your hair grows down to just above your shoulders, held in place by a headband that just seems to have appeared on top of your head. Your nipples become larger along with the flesh around it, inflating a bit into humble but well-rounded breasts. And then, the crotch transformation: you let out a soft high-pitched moan at the pain of your genitals shrinking away before your eyes, leaving nothing but the slightly ridged slit of a vagina. "You are looking beautiful already", the man says, "but you're still naked...to make sure my new maid doesn't get a cold, I've made a small addition to the usual." Out of nothing, an outfit of the finest material starts forming from undergarments to shoes and skirt; styled as the typical black and white uniform of a maid. You are still tied and on your knees, but much better dressed at the least - he even included the apron already. "You can release her now", he says, and his servant does so. You shakily stand up onto your new heeled shoes, and the man says:"I've planned ahead a bit and had a living quarters arranged for you, including different garments for in your time off. Though I doubt you'll have much. Now, what I want you to do..."