I walk through the alley, the only sound a few cats screaming in the near non-existent moonlight and the clicking of my heels on the pavement.
Approaching Desi's "playspace" I take the key from my pocket and let myself in. I don't want to flip the breakers and put all the lights on, so I find a few strategically placed ceiling lamps to see if that will do.
Approaching the machine, the memory of the girl I had placed in it's clutches comes flooding back to me. Absently I run my fingers over the controls, down to the leather pads that held her legs as she arched her back and pushed her groin into the dildo that was endlessly fucking her at an inhuman speed and voracity.

Looking around, the butterflies in the pit of my stomach contrast between excitement and anxiety; so close but so separate. I know no one is coming to follow me. There's only one key and Desi loaned me the space for the whole day. Finn is back home and the girl is asleep in my bed.
As I drop my bag and it hits the concrete, the sound reverbs off the high ceilings of the warehouse space. Nervously I go back to the door to make sure the bolt is thrown. This is not the best neighborhood and midnight brings out the worst. Silently I'm giving thanks for steel doors, brick walls and no neighbors.
Walking back to the machine, I bend and open my bag, attaching my own components and adjusting the stroke. I know it will be difficult to get the spin and slant just right but that very fact makes it more delicious. I feel like a student, sneaking into school after hours to do something very wicked and the thought makes me smile as I shake off my clothes and climb onto the table.
Strapping my legs into the stirrups, and scooting my bottom down to the end of the table, I can feel my pussy opening and ready for the assault I know is coming. By myself I can only strap my legs and torso and ONE arm so I'll have to be disciplined and try not to move my other arm, opting instead to hold the hand of the arm rest.
Thankfully, every adjustment is operated hydraulically by remote and once I am bound to the table, I make the last adjustments, pour a generous stream of lube between my legs and push the button.
The machine churns to life and slowly the dildo I attached pushes between my sodden lips and sheaths itself inside me. Pushing the second button activates the vibrator that moves against my clit. The very last button is the timer. Once the timer is set there's no going back, no matter how much I want to. The machine will continue its assault for the prescribed time.
Yes, there's a panic button, but I don't want to use it unless I am losing consciousness...
Laying back, my legs spread wide and the machine's cock thrusting in and out of my pussy, I feel myself cumming within 30 or 40 seconds. I didn't count on that, I muse as I try and twist my clit away from the vibrator, to no avail.
Still, I did anticipate my body's reaction and the vibe soon moves away while the cock pistons back into my wet cunt with it's own velocity and fierceness. My arm muscles go taut as I pull on the handles, bucking against the impossible assault on my body. Just as I am getting accustomed to the fucking, the vibe comes back down on my clit.
The light shining down from the rafters feels like an interrogation; the machine the greedy inquisitor. My nipples tighten to steel-like strength and I begin moaning. Between orgasms, I try and make a mental note to bring Finn to watch next time. In my fantasies he is watching and as I cum for the 5th or 6th time, everyone is watching.
My back arches as my pussy devours the cock one last time before my body flushes again with my final orgasm and I cum, screaming to the rafters and praising the gods of mechanical sex...
For a full 20 minutes I lay there with the cock inside me and more than once I am tempted to start it up again, but by this time it's 1 AM and I know I must return the key.
Later, as I am again clicking my heels down the alley to the car, Finn calls to ask how it was.
"Great" I respond.
"Sometimes ya just gotta scream."