Our Lady of the Hypercube

Mackenzie is not your everyday dominatrix. She doesn't wield a cat-o'-nine-tails. She won't be caught dead in leather. Do you know how badly leather sweats?
A gifted Muay Thai fighter coming off a devastating loss, she makes way more money applying pain to others with the time-dilating aids of a six-sided chamber of flashing screens and lights, blistering music, and a pair of night-vision goggles. She has 401(k) and medical.
Redemption is within reach. Love, a possibility. But memories of a severe mother resurface. Binge-eating becomes her BFF. Ah, those pesky carbs.