Ty's phone made a text received sound, and he was pleased to see her message confirming that she had permission to visit him, and stay for dinner. He replied, "I can make us lunch, if you like."
Lisa texted back, "Wow, that's an even kinkier transformation idea than the mobile app or the marbles! :-)" "But seriously," she continued, "that would be nice. Thank you. I'll see you around 11:00."
"Great, see you then!" he replied. He looked at his watch. It was only 8:30. He groaned, annoyed at having to wait more than two hours to see her. He watched some more TV, but tired of that. so he turned the set off, and picked up a book he'd been reading. The book was rather engrossing, so it actually didn't seem like a long time before the doorbell rang. He set down the book, ran to the door, and threw it open.
He invited Lisa in, and saw that her mother was in a car in the driveway. He waved to her, and she waved back, as she put the car into reverse, and pulled into the street. He closed the door. "What would you like to do?" he asked.
"You get three guesses, and the first two don't count," she said, turned, and dashed up the stairs
Ty raced to follow. Once he closed snd locked his bedroom door, she started undressing. As he was putting the one-way soundproofing, she got impatient and started undressing him. He noticed that she'd already transformed into what apparently was her favorite form: four breasts with pussies instead of nipples, four arms, two pussies side-by-side on her groin, and all six pussies with tongues, zippers, and enhanced muscles.
"Doesn't seem very imaginative," he thought to himself, then instantly regretted it. "My fault," he thought, "I've only given her the power to make transformations I've done to her previously."
"Well," Lisa asked impatiently, "Are you going to transform, or do I have to fuck your boring normal body?"
"I was just trying to decide what to transform myself into this time," he said. "Here goes." His body seemed to turn into hard plastic, except for his cock, which spilt in two, then grew to the large proportions they'd had before. His plastic body went through incredible contortions and stretches, becoming something like a rocking horse, but with two large and fully erect cocks sticking up from the seat. Looking closer, she saw that the cocks were still flesh. They weren't attached direcrly to the seat, but to a different part of his body under it, so that rocking back and forth would thrust the cocks up and down.
Lisa climbed onto the rocking Ty, inserting the cocks into her pussies, and started rocking. She could control the pace, and also the length of the cocks' thrusts. As she picked up the pace, she started moaning, and started to feel the Ty marbles vibrating. She started massaging the marbles with her womb tongue. As she continued to speed up, her moans intensified, as did the vibration of the marbles. She increased her womb tongue count to eight, and grabbed one Ty marble with each, wrapping the tongue ends round them. The Ty marble vibrations got stronger, and she made her tongues squeeze them tighter, all the while continuing rocking at a frenetic pace.
The Ty marbles were now vibrating so hard that her tongues could barely hold onto them. She was getting very close to climax. The Ty marbles increased their vibration to the point that one slipped from a tongue, then another. She couldn't hold off any more. Her eyes rolled back, she moaned very loudly, and had a toe-curling orgasm, the remaining tongues dropping their marbles. She felt Ty's cocks spurting cum into her.
She sat stationary for a minute, with Ty's cocks still in her pussies and still fully erect, catching her breath. The Ty marbles slowly settled down. She started rocking again, but slowly, and her womb tongues started slowly caressing the Ty marbles. After a few minutes of that, she climbed off the rocking Ty, and lay down on his bed, wondering whether she needed to transform Ty. He apparently realized she was done; she watched as the rocking Ty transformed back into human Ty, and his cocks softened. He got into bed with her, and they cuddled.