"Okay, now that pathetic little thing has got to go!" Sarah smirked. "I wish you had a big, hairy, fully functioning pussy instead of that pathetic cock and balls hanging between your legs."
"What the? Arrgh!! That hurts!" Karyn's father grimaced in pain as his dick folded in on itself, the tip turning inside out and plunging into the flesh of his member. The hole widened as it hit the base of his dick and sank into his crotch. His scrotum was drawn in like a loaded fishing net and vanished up into the cave. The edges of the hole formed into labia and a small clitoris grew between them. Then his dark bushy pubic hair grew longer, and the changes were complete.
"What does that feel like, Mr Walker?" Sarah asked, mockingly. "You can touch it, if you like."
"I-I-Impossible!!" Stuart gasped. Her fingers touched the lips of her new vagina and pulled back in surprise. "I-It's... really me! It's r-r-real!"
"And that's only the start," Sarah said.
Then Sarah realized something was wrong. Something had changed in the corner of her eye. She looked around to see what it was... and realized that what looked different was that Karyn was nowhere to be seen. How had Karyn managed to escape her? The door was still closed and Sarah would have seen and heard Karyn leave.
"I wish I knew where Karyn is." But as soon as she made that wish, she knew--Karyn wasn't anywhere. What was going on? It was as if she had just wished Karyn out of existence when she wished that Karyn's father... Of course. That was exactly what it was. Wishes changed reality and the man wasn't in a condition to have ever been anyone's father any more, let alone Karyn's, so Karyn no longer existed.