I imagine you stripping me down and then tying my arms behind me in a box tie. Next you run a rope from my bound arms down my back and between my legs, tying it off around my cock and balls very tight - so that any movement or struggling pulls them even further up between my legs causing immediate pain.
Now a tight gag and finally the shock collar is locked on. The next hour is spent acclimating me to understanding captivity. Just high voltage shocks, groping, spanking, humiliation. Soon I'll begin to follow verbal commands to avoid the shocks. Easy things at first like kneel, lay down, turn in a slow circle.
As the day goes on and the conditioning becomes stronger the commands become more and more specific to your tastes 'kneel with your legs spread for a picture', 'come grind against me and give me a lap dance'.
Even the slightest hesitation is greeted with a full power shock to my throat. Slowly I begin to develop into nothing more than a remote control sex toy for your use, practically falling over myself to fulfill your request before you shock me again. It gets to the point where I forget about freedom, forget about my cock and balls mercilessly wrapped in rope, and think only about avoiding another shock.
That's when you give me a sliver of hope. 'One final training task boy, if you pass this I'll let you go free... I want you to open wide and take my cock, all the way down your throat - and look me right in the eye as I fuck your face until I cum - if you satisfy me, I'll let you go - if not, you're spending the night in bondage and we'll try again tomorrow.' Over the next several minutes you defile me and I'm choking drooling and gagging as you continue to shove yourself deep into my throat.
Once you're finished and satisfied you tell me that was a good effort and that with more training I'll be quite the fuck doll. Then, to shatter what hope for freedom I had you re-gag me, pull a hood over my head, and shove me into a small storage container. Informing me that I'm going to spend the night there and that you're going to enjoy randomly shocking me all night long - you may even clamp the shock button down for a while to make sure I'm extra eager to train tomorrow. As you head upstairs turning off the lights and locking the basement door behind you, you can faintly hear my screams through the gag.