I have a thing for being completely at the mercy of a cold, faceless but ultimately benign person, group of persons or an organisation.
Like being abducted by aliens or a clandestine institute for sex research, who indeed don't have qualms with kidnaping people, but just to subject them to series of tests and therapies to find the ultimative orgasm.
So maybe I have answered to an ad for some medical experiments and was brought to a secret facility, or was just abducted from the street by some oldtimer ambulance. The people abducting me are covered in rubber and wearing masks. It's hard to make out their gender, due to rubber breasts that might be real or not. They are not rough, but though enough to restrain me on a stretcher.
In the institute itself, all guards/nurses wear the same rubber outfit. Doctors wear white rubber and surgical masks or something. I can only devide them by name tags or numbers or something.
Apart from short commands no one explains something to me, but I can get some informations about what to expect by them talking about me, referred to as a number.
Firstly after removing all of my clothing they put me in a shower room, chain me and hose me clean, then they clean my rectum.
The first exam is throughout. Blood-pressure, temparature, measurments of me, my cock and everything else, ultrasound probing of my rectum of course and lastly taking a sperm sample, with either a artificial vagina, or electrostimulation (no hands involved).
At some point they subject me, as I overhear, to a long-term test with a new, orgasm-retarding substance. I am brought to a small chamber, with just a urological chair and a large mirror. It is tiled, the upper half of the walls are painted. Then I am fixated on the chair. A special plug, with a sepperate inlet and outlet is put in my rectum, connected to an enema-bag. This is the dreaded substance.
A milking machine - something like a SeriousKit or a Venus is put on my cock, remote controlled from a room at the other side of the mirror.
To 'keep me on my toes' a mask is put over my face, connected to an anesthesia machine. But it is set to admister some kind of aphrotisiac.
Last they put a screen before me, showing me a mixture of other patients getting the same treatment and other 'educational videos'.
And I love to imagine at this point, that after a long while - I am unable to cum and nearly mad at this time - a male or TS nurse entering the room, asking me, if she should remove the plug and let me cum.
She will do it for a small favor.
With this, she removes my mask, and opens a zip at her crotch...
Yes. This kind of treatment... might actually be really funny for a while.