A simple checkup, or so it seems.

Jake smiles at the Doctor.
"That we are, Doc!" He says.
"Perfect..." The Doc says back. "Albert, would you get her ready, please? Just strip her and get her locked in over here."
Without a word, Al comes in behind you and begins to undo the buttons of your shirt.
"Whoa, hey, what's happening?" You say as Al strips off the rest of your clothes. He makes sure to fold them up and place them on a table in the corner, which is nice of him.
"It's just a checkup, 427. Nothing to worry about." Says the Doc.

In the center of the room, a gurney sits. One end is raised up, so as the one who sits on this thing is sitting up rather than laying down. On both sides of the other end are a pair of metal arms with a manacle on the end. Al sweeps you up and places you on the surface. He then pulls your legs apart and straps your ankles into the manacles. He retreats to the corner of the room, leaving you spread-eagled and ****.

The Doc, seated on a wheeled stool, rolls over to you. He is face deep in your pussy now. In his hand he has a metal tool, the kind used in doctors offices to spread open the lips of the vagina so they can look inside.
"So, 427, let's get a closer look at my handiwork, hmn?" Doc says.
He slides the tool into you, causing you to jump a little. The metal of the tool is quite cold and feels so foreign down there. While you've gotten used to stuff being shoved inside you, this is something you're hoping you won't have to experience again.
"Ah, beautiful. Just beautiful. Some of my finest work." He says, pulling the tools handle and prying you open.
"How has it been for you, Mr. Meadows?" Doc says to Jake, never taking his eyes away from the inside of your pussy.
"Oh, just fantastic. She's tight as hell and can keep up, which is nice." Jake says. "Can't hold her breath very long though."
"Well, I couldn't fit in everything." Says the Doc. "She is intended for long-term use, in my defense. Your father expects you to take better care of your toys."
Jake seems to take umbrage with that. "You've been talking to my father?"
Hmn. Jake doesn't like people bringing up his dad. Noted.
Doc says, "No no, He talked to me. During his last check-up for 438."
Jake just says, "Whatever. I don't care what he said."

The Doc pulls the tool out of you, sets it on the table and picks up a notebook to write something in.
He then stands up and approaches your side. He opens your mouth with a hand and peers inside. After a minute or two of study, he lets go and returns to his notebook. After that he does a few other tests. He probes you with various devices, takes several samples of your blood and even plucks out some hairs. Soon enough, he lays down his tools.
"Now, Mr. Meadows, I have... one last test to perform. Would you allow me access of her?"