Mastering His Ponygirl

Ah-Shay is a genie (an immortal being who's abilities are infinite), but she is powerless to resist the wishes of whoever possesses her lamp. Lord William is the new owner of the lamp, and he already has all the things that most men wish for including: wealth, beauty and power, but his interests seem stirred not by the power of the genie, but by the girl herself, and his wish is for a ponygirl.