Ah, technology! The latest NHPS is awash in all manner of buzzing, chugging and zapping paraphernalia that would also be right at home in Dr. Frankenstein's laboratory. The vacu-clit is a cute little number in itself; when combined with an industrial-strength vibrator and administered by an expert like Nina, the combo makes her prisoner beg. Not for mercy, but to be fucked with a strap-on. Happy to oblige, Missy.

Elsewhere, some venerable low-tech items do the trick(s). Cages, nipple clamps, lash, paddle and open-handed spanking are applied with lavish expertise. As a coup de grace, Nina's electrical wand provides cow-proddish behavior – precisely with whom we're not sure, but hell, all the ladies love Nina's private treatment.

Sharp lensing and neat-o production values add to the excitement, but that damned disingenuous domination dialogue has gotta go.

Retailing: There's a reason they've reached 20 volumes – it works.