Timberwolf,

Hi there. I'm not so sure some subs would consider sensory deprivation a punishment. As a matter of fact, SD is one of the things I love! So, it might not serve your purpose as a punishment.

The other thing that crossed my mind as you described how you would apply sensory deprivation, one of the hard limits for bdsm folk, never leave the sub alone, especially under those circumstances. You didn't say you'd leave the sub alone, but it sounds implied.

If your goal is to punish, consider taking away something that your sub really likes. That usually works for me. For instance, cum deprivation is used as a punishment or a treat, extreme humiliation, another...something to think about.

Nikita