Ty asked Lisa, "Would you be willing to try an inanimate form? Your consciousness would be more limited than your app form, but you would feel intense stimulation when I touch you anywhere. And you will orgasm either from that, or when I do.""
"Sounds intriguing, though I wouldn't want to remain inanimate for too long," Lisa said. "Sure, let's try it."
"OK. I'll transform you back when June gets home." He threw the pillows off the bed, then concentrated on the change. Lisa's arms, legs, head, breasts, and pussies started shrinking, and her torso started expanding. Before long, she was a featureless blob of soft, smooth flesh. Then she grew long, fine, silky fur on her entire body. Finally, her body started to flatten out, becoming longer and wider. When she stopped changing, she was rectangular, with the same dimensions as the bed, but about six inches thick.
Ty put a hand on her surface, and stroked her fur a bit. He hoped she was enjoying it, but he had not given her any means of indicating that. He pressed his hand down on her, near her middle. Initially he was able to press down easily, but her body gave more restance as he pressed further. He withdrew his hand, and the area he had pressed moved upward again. She was a living, furry mattress topper.
He picked up the pillows, climbed atop her and lay down. He used two hands to start stroking his crotch cocks, and two for two of his breast cocks. Hmm. Not enough hands, he thought, and gave himself another two arms, to stroke has other two breast cocks. As he masturbated faster and harder, he was close to orgasm. He started edging, but after ten minutes of that, couldn't wait any longer, and had a huge orgasm, ejaculating from all of his cocks, shooting cum in six directions. Because of the transformation, he knew that she had an orgasm too.
As a mattress topper, Ty found Lisa far more comfortable than his mattress. He'd always wanted a new memory foam mattress, or a memory foam topper. Now he had something far better, though only temporarily. He was somewhat tired now, and knew that she had been since her stint as the app. Without giving it a great deal of thought, he dozed off.
He awakened half an hour later, feeling very rested. Lisa should be rested now too, he thought. He was about to transform her back to (mostly) human, but then he had another idea. An area of her fur near the head of the bed disappeared, along with two smaller areas to either side, leaving her beautiful smooth skin. Then her facial features and ears started appearing. Initially her eyes were closed, but when he said her name, they opened.
"Oh, Ty, this is amazing!" she said. "This is another form I'd be willing to keep for a long time, though I know I can't. When your hand touched me, the stimulation was great, and when you pushed down, I had an orgasm. Then when you lay on me, I didn't think it was possible to be more stimulated. I was in absolute bliss. But when I felt your orgasm... there aren't even words!"
He lowered his head and kissed her. "I have another idea," he said. More areas of her fur disappeared, and her four breasts with pussies emerged, as well as a mound with her two crotch pussies.
He started fucking her like there was no tomorrow, and she started moaning, which quickly got louder, and turned into screams. "Yes, yes!" she shouted, again and again. Soon she had an orgasm, but Ty kept thrusting. He heard her moans progress to screaming again, and when she came a second time, he climaxed as well, and collapsed on her. "Oh my God," she said. "Feeling your orgasm at the same time as my own was incredible. I didn't know such intense pleasure was even possible." They kissed, and rested.
"Which mattress form do you prefer? With face, breasts and genitals, or without?"
"Without was fun, and being helpless was interesting, but I prefer with, as I definitely had even more pleasure when you fucked me."
Ty thought for a moment. "Maybe you'd like it with breasts and genitals, but no head."
"Ooh, that sounds exciting," she replied. "Let's do that next!"
Just then, they heard the garage door go up. "June must be home," Ty said, getting up off mattress Liea and standing. "You should return to human form."
Lisa pouted, but said, "Fine, but I want to try that later!" He saw her start to concentrate, and her 'body' started returning to its normal size and shape, with her fur disappearing, face and ears migrating to their usual positions on her head, her hair returning, and her extra arms, breasts, and pussy disappearing. Soon she looked normal. "You need to look normal, too," she pointed out, and she reverted him. Ty waved his arm, and all the cum disappeared, along with her excess fluids, and their sweat.
They got dressed and went downstairs to greet June.