No sense beating around the bush, so to speak...

Well, given the nature of the situation, I feel that we should get right to the vaginal examination,” saying this, she firmly but smoothly pushed you so that you were lying back against the wall, and with the same level of authority, rolled you on to your stomach.
\
“Umm… nurse, I understand it’s important to check to make sure that nothing is wrong with me, but is this really necessary?” You asked, hesitantly.

“Yes, Danielle I am quite certain. Now, ended up in my office because of a problem you were having, so why don’t you just let me do what I’m trained to do, hmm?” Nurse Hollywater said, with a commanding tone to her voice.

Feeling a little chastised, and not wanting to disappoint the nurse any more, you accepted the position she had set you in, though it was a little awkward. You were belly down on the hospital table, with your legs and feet just dangling down about 6 inches off the floor. You had to hold on to the edge of the table just to stay up.
“Now, this exam can be a touch uncomfortable, so I am just going to fix you up so that you aren’t squirming too much.” With that, Nurse Hollywater, fastened your hands to two holes in the table you hadn’t noticed before, and fastened your feet to the corners of the table.

“Umm… Nurse Hollywater, I promise I won’t squirm too muuuffftt…” you said, as a gag is efficiently placed in your mouth.

Just like that, you were lying faced down, mostly naked, tied to a hospital bed. Very quickly, you could feel a cold, hard object just barely touching your labia.

“This is an instrument I devised to determine conditions inside of your vagina. It’s well lubricated, so it shouldn’t hurt too much going in.” Nurse Hollywater advised.

She was mostly right, it probably wouldn’t’ve hurt too much except she had jammed it in pretty hard. Then she slowly pulled it out, then jammed it back in again. She did this a few more times slowly. You wondered how the in and out motion could possibly be helping the examinations. Out of curiosity, you tried to turn your head around just enough to look behind you, and you were more than a little surprised by what you saw.

Whatever the device Nurse Hollywater was actually using, it was attached to a kind of harness that she was hearing around her legs. She was fucking you with a strapon! As her eyes made contact with your, she gave you a stern look and smacked you on the butt.

“Keep your eyes forward. For the device to get an accurate reading, it needs to be moved in and out of the vagina, and I’ve found that this is the easiest way to do that,” said Nurse Hollywater as she gradually picked up her pace.

Without being able to struggle or talk, all you could do was focus on the feeling of the device pumping in and out of your pussy. It was an incredible feeling and as the nurse continued to pick up the pace you were rapidly approaching an orgasm. You started moaning through the gag, which only served to make you feel more embarrassed about the situation.

The nurse can apparently tell from your wriggling that you are about to orgasm and withdraws the “sensor.”

“Well Danielle, it appears as if your vagina is operating normally. How shall we proceed with this examination?” Nurse Hollywater asks, removing the gag so you could answer.