Sara returned with a devilish grin and something hidden behind her back.
"Let's make him look more like Adrian first," she said joyfully.
She pulled a large black strap-on from behind her back, and giggled as she saw the huge smile disappear from my face. The strap-on was made of thick silicone, and was black and very shiny. Sara slipped the end of it over the tip of my cock, and pulled it all the way down to the base of my cock. It was already lubricated, so my erect penis slipped inside it easily.
There were two realistic looking black balls hanging from the strap-on, that hung in front of my own nuts, and pushed them up and back into my ass-crack. The strap went up between my ass-cheeks like a thong, separated into two thin straps, wrapped across my stomach, and fastened in the middle of my tummy, by my belly button. The strap-on was basically a cock extender, and as Svetlana knelt before me she was staring at a nine inch black cock.
"Perfect," Svetlana said, "just like Adrian's."
Svetlana looked up at me one more time, with her piercing blue eyes and her Barbie Pink lipgloss. Then she extended her tongue, and holding eye contact with me, took the tip of my cock into her mouth. The visual was fantastic. A young Czech girl with great tits, wearing a bikini as she knelt before me on her sucky pillow, and slowly sucked my cock-head.
However, I felt nothing through the silicone strap-on I was forced to wear. Sara knelt down next. She was dressed identically to Svetlana, and started to give the younger girl tips on what Adrian likes in a blowjob. Sara and Svetlana alternated between sucking my cock, and I felt absolutely nothing.
Occasionally I would look down at the visual, and this would cause me to breathe in sharply, from frustration. This motion would also cause my little bell to ring, and both girls would start laughing. It was pure sexual torture to watch the beautiful young Czech girl and my wife suck my cock, as they knelt on their heart-shaped sucky pillows.
The lesson lasted about an hour, and covered everything from edging, tongue bathing and deep-throating. Sara finished off by showing her student the fine art of nibbling a guy's nuts. Specifically, Adrian's nuts, as apparently he was quite fond of this sexual activity. My nuts were being forced up my ass-crack by the strap-on. So, unfortunately for me, all of the girls attentions were focused on the large black nuts, that were part of the strap-on.
Svetlana did graze my nuts on one occasion, and I don't think it was accidental. She had her head under the strap-on, and was leaning back with her tongue fully extended. She gave my scrotum a quick nibble, and I flinched involuntarily and my bell jingled.
Svetlana let out a giggle, and said "Oops, my bad," as she and Sara were cracking up.
"You really rang his bell," Sara exclaimed with joy.
After the extended session of fucking with me, the girls called it a day. I was sweating, from the sexual frustration of being tormented by these two women. They had a blast at my expense, and both of them told me they couldn't wait to do this again. Sara put their pillows away, and Svetlana removed the strap-on from my blood engorged cock.