A semen extraction facility

After a few moments, the hospital bed rolls into a new, rather empty room. Its white walls reflect the fluorescent light while a complex machine hangs from the ceiling. The nurses push you under the machine as it starts to unfold itself, tubes appearing and disappearing as mechanical whirring fills the room. Until finally, a white cylinder hangs right above your crotch.

One of the nurses undoes your belt, unzips your pants and grabs your flaccid cock. Not even giving you some assistance, she simply forces the white cylinder over your cock. A flash of fear passes through your brain as the cylinder opens, revealing rows upon rows of what seem to be long, grey needle-like protrusions.

And then the cylinder clamps down, and all you can feel is bliss.

Somewhere seemingly far away you can hear mechanical whirring and pumping, but your entire mind is focused on the pleasures the machine brings you. Every single inch, every vein, every ridge and every single cell is stimulated at the same moment. It feels like you need to cum almost immediately.

The machine keeps doing its work, it's inner walls contracting around your cock, as its feelers caress your length. It starts to pump more and more lube on your cock, as you feel the thick wet slime drip down on your balls. Weirdly enough, the smell reminds you of wet pussy.

The machine keeps pumping and pumping, up and down, twisting and turning. Again and again it manages to bring you to the edge and then blaze past your limits in another wave of bliss.

You lose track of the time as the machine keeps working, untiring and unstoppable. You wonder how long it would take you to orgasm from the machine's ministrations. You start to lose feeling in your extremities as the pure pleasure is simply too much.

Then, you notice something from the corner of your eye.

A long, thin cylinder is filled with something white. And another is halfway.

Adrenaline floods your body, and the haze of bliss floats away. You strain against the bonds binding you to the bed, but it is futile. Then you hear the doctor.

"Interesting. Very interesting. You started like most men, Doe. The machine didn't even need to hit your pelvis and you already started cumming your brains out. But unlike so many others, you've got an almost superhuman stamina. And the quality of your sperm...I've got to make a few calls!"

With those words, she leaves.