Dreams of a slave...

I am alone in a booth of some sort, kneeling, naked, with my wrists crossed behind my back, right wrist cuff clipped to left ankle and left wrist clipped to right ankle to be sure I could not unclip them myself. I am not blindfolded or gagged, but the lights are off in the room and the top of the booth is closed.
Suddenly, You open the top, the booth comes up to Your bottom rib since I am on my knees. You look over the top to talk to me.
"So, the girl likes to cum even if she doesn't ask?"
"Yes, Master."
"Well, then, no matter what, DO NOT CUM. Understand, girl?"
"Yes, Master."
A slot in the bottom of the booth opens and You slide a silver bullet in, positioning it so it rests against my clit, turning it on high. The slot closes, and so does the lid of the booth. I think You have left the room, You have not. You hear me moaning and whimpering, trying to follow the order to not cum.
The top of the booth opens again and You peer in, looking at me as I struggle to not cum. You make a tsk tsk noise and close the lid again. You adjust the bullet again, trying to distract me, but I hear You mumble something and a few grunts. Suddenly, a hole in front of my face opens and a cock appears before me. It being dark within the booth, I do not know whose cock it is. Knowing what Master would say and how He would expect His girl to behave, I move my head closer to the cock, putting my lips around it. As I lean closer to the cock, the bullet rubs my clit differently, sending chills along my body, drawing me even closer to the forbidden orgasm.
Once the owner of the cock is settled, He begins to pump into my offered throat. I hear Master's voice from outside the booth, "Please the cock, girl, but don't forget, DO NOT CUM!"
With Master's voice fresh in my mind, I continue to allow the unknown cock to invade my throat, knowing it feels too thin to be Master's, the drops of precum tasting too bitter to be Master's. After a few more pumps into my open throat, the invading cock exploded down my throat, the taste and feel of the thick cum confirmed my thoughts that I was not servicing Master's cock.
The strange cock withdraws and again I hear mumbling and grunting from the outside of the booth. Again, the hole in front of me opens and another cock slips in. My mouth is around it as soon as it is fully through the hole. This cock is thick and long, the droplets of precum taste familiar and I know instantly it is Master's cock. The top of the booth opens for a moment and I hear Your voice.
"Keep your lips against the side of the booth, girl, and don't move them," closing the top of the booth as soon as He is done speaking
I do as I am told and press my lips around the edged of the hole so Master can pump into my mouth at His own pace. The slot at the bottom of the booth opens again and the bullet is moved to a new position on my clit, again sending chills or preorgasm through my body, the still forbidden orgasm threatening. I moan around Master's cock as the slot is again closed.
Master pumps faster and harder, then slower and deeper. At His own pace, I can feel Master drawing closer to His own pleasure. The top of the booth opens again.
"Move your lips back, girl." The lid closes once again as I do as I am told. As Master gets the final stiffness that means He is about to hit His pleasure, He moves back so the head of His cock is just barely inside the hole in front of my face. Master begins to shoot His thick, hot cum onto my face and tits, covering me in the streams of it.
When Master is finished, He opens the top of the booth to peer at His handiwork. He speaks a few words.
"Did the girl cum?"
"No, Master."
"Did the girl do her best to pleasure the first cock?"
"Yes, Master."
"Good girl. Remember, no cumming." With that, the lid of the booth is closed, the hole is closed, and the slot at the bottom is closed, leaving the bullet against my clit. Master waits long enough for His handiwork to dry before opening the lid to speak to me again.
"Whenever that hole opens tonight, you are to pleasure the cock that comes through it, no matter how long or short it takes or whose cock it is, you are to pleasure it. You will have 30 seconds from the time the cock shows up to put it into your mouth. Do you understand?"
"Yes, Master."
"You will NOT cum tonight, no matter how close you may get."
"Yes, Master."
"Sleep now, girl."
"Yes, Master." With my reply to the order, Master closes the top of the booth. I fall asleep for a little while, until I feel the tip of a cock against my lips. I open my mouth and the cock pumps into my throat. It is not Master's and explodes in my throat shortly after it enters. I fall asleep again. Every so often, the bullet turns off when Master changes the batteries.
In all, during the night, I am presented with three cocks that are not Master's, all of them explode in my throat. Once more I am given the first cock to pleasure again. I am presented with Master's cock four more times, every time, He explodes all over me instead of in my throat, two of those times I was only allowed to pleasure Him with my mouth for a minute before He exploded on my face, the result of His self pleasure.
From the sounds I can hear when the hole is opened or the slot for the bullet to be repositioned, I gather that I am in the room to be used for a cum deposit for Master and His friends during a porn viewing marathon.