(Right back at ya, pakkwiman ;D)
Jon held his breath for a moment, hoping against hope that he'd come away unchanged, but all too quickly he felt a strange tingling as he began to transform.
The first thing he noticed was his hair growing rapidly. In just a few seconds it had grown down almost to the base of his neck, lightening from black to a rich brown as it did. As that finished, two small lumps formed on his forehead, up by his hairline. He stared in the mirror as they grew further, forming into two fleshy antennae about nine inches long. They were covered in bright yellow skin, and each had a knob-shaped sensory organ on top. As these finished forming, Jon felt what could best be described as an expansion in his sense of smell, and found he could detect certain chemical aromas that were, er, unsmellable before.
It wasn't until Jon was done staring at his new antennae that he noticed that his face had begun to change as well. The difference was subtle at first, but it was beginning to look softer and more delicate. There was something of a puffy feeling in his chest, too. He wondered what that was about, but he was quickly distracted by a painful pressure in his lower body, as something began to strain against the inseam of his pants.
He quickly yanked off his pants and underwear, only to be greeted by a more alarming sight. The skin on his legs had begun to grow together, wrapping the part of his lower body from his pelvis down to about his mid-thigh in one unbroken layer of skin. As he watched, this covering grew downwards, until the whole of his lower body was wrapped up like a coccoon made of his own epidermis.
And like a real coccoon, changes began to take place underneath it. Jon could feel his musculature changing as his legs knit together into one solid expanse of muscle. The bones that gave his legs structure began to dissolve, and he was left trying to stay upright on only a column of muscle. He couldn't keep ot up very long, and as his leg-bones eroded away he began to sink lower to the ground.
The puffy feeling in his chest had increased in intensity, a rapidly-building yet not uncomfortable pressure, and he looked down at it, trying to figure out what was going on. His shirt was large and loose, but...were those bumps underneath where his nipples should be? Wait, that couldn't mean...
His thoughts were interrupted as the pressure suddenly released, and he watched as his chest bloomed into two separate masses of flesh. Even under the loose shirt the curvature of two modest-sized female breasts was unmistakeable.
Jon looked at the mirror. He sat much lower now, but he could still see his upper body in it. And it was unmistakeably the upper body of an attractive young woman. Frantically, Jon looked downwards. His penis was still there, but it was shrinking visbly. This couldn't be happening! He couldn't be turning into this girl...thing!
But he could, and he was. Looking down made Jon notice that his lower body was changing even further. His lower skeletal structure was gone now, and he sat atop a lower body of flesh and skin. From the waist down, except for a little patch around his changing genitals, Jon's skin was changing. Around most of the circumference of his now-wider hips, it was becoming the same soft, bright yellow skin as on his antennae, but along a swath in front it was turning translucent white, following the gentle undulations in the muscle of Jon's new gastropod foot. The swath was bordered by a fringe of loose skin, the same translucent white.
All of Jon's changed skin began to secrete a coat of mucus to protect it from rough surfaces and foreign substances. He suddenly began to feel thirsty, but this need was pushed aside as he watched the changes complete. The skin on his new foot finished changing just as his penis disappeared completely, replaced by her new vagina. Jon had become a girl with the lower body of a banana slug.
Jon nearly screamed at this finalization of the past couple minutes' bizarre events, but she suddenly remembered the stone. She found and grasped it. "I wish," she said, in a higher and softer voice than before, "that I would become my old male human self again."
Nothing. Shit. "I wish I knew why the previous wish didn't work."
She groaned. The wish that changed the sun had drained almost all of the stone's power, and only very minor wishes could be performed until it recharged.
Jon was almost afraid to ask, but she had to know. "I wish I knew how long until the stone will be recharged."
She gasped. Six months. She was going to be stuck as a slug-girl for all six months until she could fix the sun.
