You nod

You nod, avoidant of plunging yourself into a fate of pain and denial.

"Excellent," he says, and he proceeds to unlock his zipper. You suck him off to your best knowledge, and your earn a load in your mouth after a couple of minutes. After that, your ballgag is secured, and another question is asked from you.

"How about the tables?" he asks. And you feel like your blood is boiling again. Will he ask this every day? And if so, how long could you resist the temptation?

Sadly, it seems your choices here are being between a rock and a hard place. Albeit the fuck table seems to be a lot better option than the glass prison.