If Jenny thought life was hard under the expert tutelage of Mark, being faced with a stable full of sex-starved pony girls poses several more challenges. For instance, how do you bring eleven young women to orgasm in a timely fashion? But to her surprise, tackling the problem with experimentation and enthusiasm, she finds herself enjoying the experience. When training begins it is anything but enjoyable, however. Harnessed in pony girl tack, her body is encircled with leather, rubber and steel. It nips, chafes and rubs cruelly, especially when she's faced with a morning of naughty games in the exercise yard. In Book Four of Pony Tales Jenny earns herself several punishments, and is subjected to some very thorough sex indoctrination she has to submit to the whims of her groom, trainers and even the stable-hands. Will rescue arrive or will she have to beg to be released, with nothing more than her body as currency?