Taken away for interrogation or actually interrogated? Which is the fun part, the brutal, unreasonable questioning to which there are no real correct answers, just excuses to inflict the inevitable punishment, or the punishment itself?
Here's thought, if you found someone willing to gamble that if you brought your fantasy as close to real life as possible, that is she allowed you set up your instruments of torture, connected to, or in, her restrained and defenceless body, you wouldn't actually switch it on?
Say for example you talked to her beforehand and she expressed her thrill in terms of threat and dread, telling you that the erotic terror she imagined intoxicated her so badly that, once subspaced, she would actually agree to offer herself to it. Imagine your thrill too Sir and how the threat would need to be real for the power in your fantasies to be realised too.
Imagine that you have her. You have her trapped, exposed, vulnerable, available and wired up. She's so scared she can hardly breathe, her breasts ride her ribs as she's panting terror, gasping sex because she knows she trusted you driven by her own lust, abandoning her common sense. How much you hurt her is now only a matter of faith.
You're only playing but, how real you want the game to be? That would be the sweet spot wouldn't? That's the moment I imagine.