Hmmm, now, what to do with you...
Before you unlock yourself, you need to fetch something to tie your hand up with. A rope is good, handcuffs are better. If you freeze the handcuff keys into a block of ice, so you can't unlock yourself until morning, all the better.
I want your dominant hand tied to something heavy, and ideally stationary, so that you can't stroke with it, but no cumming until I say!
If you've nothing to tie yourself up with, you're a bad slave! Shame on you. I'll have to punish you later. Form now, slap your swolen balls ten times for Mistress.
Once you're ready...