A custom fantasy:

Queen Isobel welcomes slave z to her castle of pain. As an initiation he is given a set of excruciating instructions to fulfill. mastering the techniques of pain Queen Isobel has created for her subjects is a matter of prestige and ranking among her subordinates. Can slave z follow the commands perfectly, swat clamps off his own genital banjo, and succeed at the daunting task of the JOI zipper? If he cannot, he must try and try again.