The next time I spent the evening and night with Carina, she described, while administering my enema, a new session that Crystal and Lynn designed. It's an "open house" strap-on session with a new twist.

"Since you've been used by the staff several times, you should have some feel for how each nurse uses the strap-on. In this variation, they won't spank you before using you. Instead, you'll be blindfolded and used by any of the staff who wants to. Then you'll be asked to guess who just did you."

I struggled to retain the enema.

Carina continued, "If you guess wrong, you'll earn five strokes at the end of the session. After everyone's had a chance, I will draw a name of the girl who will administer your discipline, and then you'll be left alone with her. Unless she tells you, you won't know who disciplined you. Oh, and you start with a balance of ten strokes, so anything you earn is over and above that."

Carina explained that she wouldn't use the strap-on in that session, since she'd be overseeing and co-ordinating the events.

An hour later, I was face down over some pillows on Carina's bed. She was insatiable as she fucked me with her strap-on. Oh, how she pumped and plowed! At long last, when she was satisfied from using me, I had my mouth between her hips which had so energetically pumped me with the strap-on. I sucked on her pussy and gave her more orgasms, after which she took me in and we had sweet intercourse.

Midweek, I was at the clinic for the new session. Carina gave me my enemas and teased my turgid boner during the time that I held the solution.

Then she bound me bent over the punishment box and secured a blindfold on me. She packed me well with lubricant and I waited for the first use of the strap-on.

I could only hear and feel. I heard the sounds of a nurse donning the strap-on harness, and I felt her hands grasp my hips and spread my buns. Then came the penetration; the pumping; the thrusting, and my exclamations. After a considerable time she withdrew. Carina asked me to take a guess.

The technique of that first one was not very familiar to me, and I guessed Leah. Carina said that she also would not tell me if I had guessed right or wrong - that way I could not use the process of elimination in subsequent guesses.

The second nurse to use me felt like the sessions I'd received from Lynn - very thorough, with a sensuous flavor. Then there was a rather brusque, powerful fucking, and I guessed Becky. The session continued with several others, and Carina logged my guesses. When it was apparent that no further takers would be participating, Carina announced that I had mis-guessed five of the nine nurses, which brought my tally to 35 strokes. Then she stated that she was going to randomly draw the name of one of the participants, and send her in to discipline me with a strap, so that I would have less of a chance of figuring out who it was.

I waited several minutes, and then heard the door open and close. With no warning, my disciplinarian gave me the entire allotment of 35 strokes without pausing. She had a skilled follow-through, and it could have been any of the nurses at the clinic.

The mystery nurse unfastened my bindings, except for the ones tying my hands together, and gingerly led me to the oversized examination table, where I was positioned face up. I was still blindfolded, and the nurse fastened my hands above my head, presumably to keep me from touching any part of her. Interestingly, she also cinched a binding strap around my hips.

Suddenly my mouth encountered vaginal lips surrounded by pubic hair. I kissed, licked, and sucked on her pussy. The taste and scent were unfamiliar to me. I kept on, and heard my mystery nurse breathe heavily through a couple of orgasms.

She shifted her position, and, to my surprise, I felt my now stiff member being inserted into my mystery nurse's pussy. Straddling my midsection, she slowly pumped her hips, pausing frequently. I could not plow her pussy because of the bindings around my hips. She continued the tantalizing process of pumping her hips until I was ready to spurt, and then pausing until the feeling subsided. Any man who has gone through this knows that it can almost drive him insane.

When the mystery nurse was satisfied that she had taken me to the brink of delirium, she slowly and skillfully brought me to the finish line, and I erupted inside her. Bear in mind that I could not move my midsection during ejaculation, and I compensated for it by my exclamations and thrashing about wherever I could move.

She got up and left the room. Carina came in and release my restrains, and I went home satiated.

When I told Crystal about the session a couple days later, she acknowledged that she knew who the mystery nurse was, but would not give me any clues.

"I'll tell you that it wasn't me," she said, "and it's also no one whose pussy you've been inside before. Now, why don't you take off your clothes and bring me the rattan cane. I'm absolutely itching to use it!"