Maybe a month later, I had a trip for work and arranged a little detour to visit Kara. She was excited about the prospect of my visit and teased me that she had a ‘special surprise’. I was to arrive late in the day and we decided to meet to play and then go grab dinner. She was emphatic that it was my turn to receive and I happily agreed. She met me at her front door in a most unexpected outfit - something like a Halloween sexy nurse costume. The top was a zipped medical smock - mostly unzipped. There were no bottoms - just frilly red panties. She led me back to her spare room - a makeshift clinic with a massage table for my ‘exam’.

“Have you been following the healthy habits we discussed?” she asked.

“Not as much as I should,” I replied.

“Well, then, we need to deal with that to begin with,” she countered, withdrawing her hairbrush from a pocket of the smock. She took a seat on a chair and scolded me while undoing my pants about how I needed to follow medical advice and the only effective response was a good spanking. The anticipation of going over her knee and the view of her mostly open smock had me fully hard. She chided me on that, too, and pulled me over her lap.

She spanked on and off for at least five minutes. She had a very effective routine, swatting fast and hard, bringing the heat and sting to near my limit and then pausing to rub and scold, then repeating that cycle numerous times, resulting in a very hot, sore bottom. She instructed me to step out of my pants and lay face down on the table. She handed me her iPad and set her phone into a goose neck holder clamped to the table. She had discovered an app that would display the phone’s camera on the tablet, so I could easily watch the action.

As expected, the first step of the exam was to insert an old-fashioned thermometer in my ass. Having a front-row view of the scene was splendid. She dithered the thermometer briefly then set about filling two syringes. She then revealed her ‘special surprise’. Her new friend, Erica, was a nurse practitioner and had advised her on a concoction for injection play that was totally safe yet stung like crazy - on par with the burn and pressure of antibiotic shots that injection aficionados like us craved. The vials of vitamin cocktail were on ice and after filling the syringes, she nestled the syringes back in the ice to stay cold. She returned to dithering the thermometer and eventually withdrew it to read it.

“You’re due two booster shots,” Kara declared and swabbed my left cheek with alcohol. “Get ready,” she instructed. I knew she meant for me to tense my glutes and once they were taut she brought the tip of the needle in contact with my cheek and then slowly pushed until the tip pierced the skin and the needle sank into my bum. We knew from countless experimentation that this slow approach accentuated the sensation of the needle entering the tissue over the usual quick dart method used by ‘real’ medical practitioners - after all, we were looking to accentuate the feeling. I watched with rapt attention as she rather quickly pushed the plunger down, forcing the serum deep into my muscle and at the same time feeling the intensity of the deep, burning pressure grow. This was easily the best medical play I had ever experienced.

She repeated the process on my right side and soon both cheeks were sore on the surface from the spanking and aching more deeply from the shots. The new serum idea from her friend plus the ability to watch had been fantastic. Since Kara had apparently revealed our fascination with shots to her friend, I had to wonder if Erica might like to join us some time.

“Ok, roll over,” Kara instructed. I did as instructed and parted my legs slightly as Kara introduced her gloved, lubed left index finger into my butt. While she prodded and massaged my prostate, her right hand began to stroke me. Quite soon I was near apex and apparently surprised Kara when the first pulse of cum spurted out. She squealed with delight at the development and keep stroking as several more, very generous streams shot out and mostly onto me. She licked her right hand clean of rivulets of semen and then pulled off the glove. “That was a tasty appetizer. Let’s go get something to eat and when we get back, I want to be the patient,” Kara announced.