Tony felt freaked out by the sensation and he put his hands on Alice's thick thighs to lift himself off her and try to understand what just happened. As he touched her again, however, she thrust a second time and he was enveloped in the pleasurable sensation. He wanted to get off. He wanted run away. He really wanted his penis back. But something primal in him could not let this sensation pass.
Alice reached out and put her arms around him, holding him against her soft, thick torso. Tony closed his eyes and fell into the sex, half-horrified and half-exhilarated. Every time Alice pushed into him, he felt like she lifted him up off the ground a little higher. His body loved the feeling. He would remember this forever.
Then a new realization hit him. She really was lifting him off the ground. His toes no longer touched the floor. His weight was resting entirely on her. He opened his eyes and looked down, felt distracted by eye-rolling pleasure again, and then paid attention. Alice's legs seemed to have lengthened, and his had shortened.
"Can you stop for just ... a ... moment," Tony's voice sounded so weak.
"Oh, no, honey, I'm not going to stop until we're really done!"
Tony heard how her voice sounded so much stronger. So deep. So distinctly like his own. He looked at her. He saw his own lips smiling back at him. "This isn't right," he said, and he noticed that his voice didn't just sound weaker, it sounded feminine.
A horrible thought occurred to him and he looked down at his legs that seemed so much shorter. They were also stouter. He looked at Alice. Her legs were getting longer but they were also thinning out. He recognized his own scar on her leg and panicked. The panic was replaced by intense pleasure as she thrust again, but there was no denying what he saw: as her legs got thinner his got thicker. His thighs seemed to have ballooned, pulling his shorts tight. His leg hair vanished, and hair covered hers.
In front of everyone, he was engaging in sex with a hairy-legged man. He was embarrassed and scared. But the pull of the sexual pleasure was too powerful to stop. He figured he had already climaxed, but the incredible sensation was growing stronger.
He felt his butt become heavier. It plumped up, expanding, taking up more room than ever. His shorts reached their breaking point and the seams stretched. They became intensely uncomfortable. He dreaded to think of that amazing skin and those full cheeks covered in cloth. They deserved to be in something more revealing. He needed a bikini. He stopped that line of thought, scared at how he was thinking of his own body.
Alice reached around and squeezed his engorged butt, causing a new sensation to course through him. He put his arms around her and squeezed. That part of him that wanted to stop was getting weaker and weaker.
Alice put her lips near Tony's ear and whispered, "I don't think I can hold you up any more. You'll need to get down on the ground, if you don't mind."
Tony shuddered and then experienced something new. The burning he had felt in his genitals earlier came again, except this time, it came from his chest. He knew what was about to happen.