Many thanks to LSEiland for first editing and improving this story, to AriannanX for making it much better and to NaughtyCaress for finding some more things I missed and getting it in the best shape yet.
*
"Your sister is crazy," Wendell said as he hung up.
"What did she say this time?" Jane asked.
"It wasn't her. It was Cal pulling my leg with one of his weird fantasies. I couldn't believe it when he told me Joan was going along with it, but he swore he was telling the truth.
"I saw your eyes getting wide."
"He said he and Joan want a video of themselves making love, and they selected me as the cameraman. I told him there was no way you would agree. Wait a minute! Why are you looking at me like that? Did you know about this?"
"Joan told me a few weeks ago. It's part of their new obsession with preserving memories. They're documenting every second of their lives with photos and videos.
"She's been working on me -- and I finally gave in. They're crazy, but I decided it would be safer if you did the video rather than some professional. I'm sure most of them are legit, but I've heard some stories about private videos ending up on the Internet.
"While you're there, I'll be thinking about your threesome. I want to hear every detail when you get home, and then we can make some memories of our own."
"Did you say threesome? Is there more to this than Cal told me?"
"I used the wrong word. I just meant the three of you. You can watch them, but you better watch out, too. Any part of your body that touches Joan while she's naked gets cut off."
She laughed a familiar laugh. He knew it meant she was joking and dead serious at the same time.
"Joan and Cal are so funny," Wendell said. "They think they're the greatest sexual performers on the planet, but the stuff he's told me is pretty tame compared to what we've done."
"Well, we don't need to prove anything, do we? I think Joan realizes that we're way ahead of them, and she's jealous."
"How do you know?" Wendell asked, trying to keep a straight face.
"She tells me everything."
"And what do you tell her? Don't try to deny it. I know you tell her everything, too. Seriously, you really want me to do this on Saturday morning?"
"Yes, and then I want you to come straight home to me."
*****************
Joan and Cal lived a mile away, but Wendell took his time getting there. His mind was racing, and he needed to calm down. From the moment he woke up Saturday, he had a hard-on from thinking about watching them. It was the most bizarre sexual scene he had ever been involved in.
When he walked in, he could tell his sister-in-law and her husband were excited. They were dressed in sweats and eagerly led him through the house to the master bedroom.
Wendell blinked as he stepped through the door, momentarily blinded by the bright lights illuminating every inch of the room. He saw video cameras set up on tripods around the bed, some high, some low. Cal handed him another camera.
"It's for close-ups," he said and laughed, nervously pointing to his crotch. "The other cameras are synchronized. We'll edit everything later."
Joan and Cal looked at each other and at Wendell. Were they thinking the same thing he was? Was this really going to happen?
His sister-in-law turned her back to him and wiped her hands nervously on her sweats. She took a deep breath and began lifting her top. Then she stopped, thought for a moment and turned to face him.
She grinned as she began teasing him, bumping and grinding like a stripper while she slowly pulled off her top and her pants. She wasn't wearing anything underneath.
Cal had already shucked his clothes and was sitting in the middle of the bed watching her from behind. Wendell raised his camera, but Joan motioned for him to put it down. She was putting on the striptease for him, not the camera.
When she was naked, Joan stood facing him, legs spread, hands at her hips and eyes full of invitation. Then she laughed and turned around and joined Cal in bed. After that, she ignored Wendell.
As Cal and Joan had sweaty, energetic sex in a variety of positions, he tried to concentrate on composition and focus, but he wasn't made of stone. What really got to him were Joan's short breaths and little sighs as she came. They were the same sounds Jane made, sounds that always drove him wild. He had to adjust his pants several times.
At last they seemed exhausted. Joan had been riding Cal and had just come again. She had collapsed on top of him, and Wendell got a close-up of Cal's cock getting soft and dropping out of her, releasing a river of come from her pussy. She lay on top of him, and both panted from their exertions. Cal spoke first.
"Only one more thing -- the DP."
"What?"
"I can see you're hard as a rock. It's always been a fantasy of mine to do a DP with Joan, and I know this is the only chance I'll ever get."
"I know Joan doesn't want me to do her ass," Wendell said. He paused before adding, "Even if she did, Jane would kill me."
Joan raised her head from Cal's chest.
"What are you talking about?"
"Cal wants me, uh, to, uh, to make love to your ass while he does your pussy. It's called double penetration. You must have seen it when you watched Internet porn."
"No, I never have," Joan said, "and forget it! No way! I did anal with Cal once, and it hurt to walk for a week. This thing is over, Cal. Let go!"
She tried to remove Cal's arms, which were wrapped around her back.
"Not on your life," Cal said. "You're going to tell Wendell it's okay to screw you in the ass. I'm already hard again thinking about it, and I know you can feel it."
"You're crazy! I will never tell Wendell that, and even if you hold me, I know he won't do it."
"You're right," Wendell said. "No matter what you say, Cal, I'm not doing this."
"Joan is going to persuade you," Cal said, "because unless she does, I'm going to tell you a couple of things about your wife."
"What?" Joan yelled. "You bastard!"
She jerked her arm free and slapped Cal hard on the face. Cal grabbed the arm, pulled it back and then tightened his arms around her, holding both her arms against her body.
"What are you talking about?" Wendell asked.
"Ask Joan," Cal said, calmly. He had begun moving in and out of Joan again. She tried to get free but didn't make any headway. Her face was full of fury as she lifted it and looked at Cal. She began spitting out words at him.