A few days later, the after-dinner hijinks with Jill still rattling in my head, I came home to find Jane’s car in the driveway and another unfamiliar car parked in the street. I figured Judy was having guests for dinner or similar. I used the direct door to my room, dropped my messenger bag and was about to get changed into something more comfortable.

I heard multiple voices and realized Jill and her daughter’s must be over, too. There was a knock on the door and Jane called, “You in there? Your presence is desired in the kitchen. Chop. Chop!”

I walked into the kitchen to find the five women I suspected plus Lynn from the clinic. “Ok, one more. It’s gonna be a real party,” Lynn said.

I looked quizzically at Judy and she explained that friend the girls had stayed with after the concert had tested positive for hepatitis. As a precautionary measure, anyone exposed was receiving a shot of immunoglobulin, including me. I looked over towards Lynn and saw a tray containing five full syringes. Lynn was in the process of filling a sixth - presumably for me.

“So aren’t you now potentially exposed?” I asked, looking at Lynn.

“Good point,” she acknowledged, adding the latest syringe to the tray. She reached into her bag, retrieved another syringe and filled it, as well. “Who’s first?” she asked.

There was a brief silence and then Judy said, “Me.” She was wearing yoga pants and pulled them down in back to expose most of her right ass cheek. It was then, that I realized I had played with every other bare bottoms except hers and Lynn’s.

Lynn gave a three count and poked the long needle into Judy’s rump. She quivered slightly and she breathed audibly as Lynn depressed the plunger, forcing the serum deep into Judy’s glute. Jill went next, the Sophia and Elisa and then Jane. I watched intently each reaction to the exposure and then discomfort of the shot, most rubbing the site afterwards. Seeing their partially exposed bottom get jabbed made me harder and harder, creating a significant bulge in my pants that all the women noticed - except for Lynn as she was focused on the job at hand. That was until it was my turn. She glanced at me and did a double take. “Ok, mister, your turn.” I lowered my pants to present my bare cheeks to her. I felt the coolness of the alcohol and then a sharp twinge as the needle entered followed by the growing ache of fluid being forced into my muscle.

“Ok, who’s giving me mine,” Lynn asked. The other women shook their heads while I eagerly volunteered. Lynn gave me step by step instructions and I got even more turgid seeing, touching and then jabbing her proffered ass cheek.

Judy glanced at her watch. “Hey, we better get moving,” she said to her family, then turned to me “Girls-night-out, we have tickets for the new romcom movie. And we’re gonna be late.” I nodded as then hurried out the door, Sophia and Jane still rubbing their bottoms.

Lynn was packing up her gear and asked, “Since we’ve been abandoned like that, would you like to give me another injection?” I must have looked a bit baffled. “Fill me with some cum. Orifice of your choice,” she clarified. We walked to my room and I quipped, “Eeny, meeny, miny, moe. Such a tough decision. Do you have a preference?”

“How about the traditional way - your dick, my vagina,” Lynn replied, stripping off her scrubs and flopping down on my bed.