His dick buried in Lucy after their foursome, while Zoe and Sarah ate each other out, Jon decided that if he was ever going to be sure his power worked, he'd have to make some really crazy changes.
"Lucy?"
"Mmm, yes Jon?"
"I can create multiple bodies for myself and my sex slaves. I can also take away all the bodies of any of such, leaving that person as a disembodied mind until I given them a body again. This does not affect my other powers in any way."
"Well, of course, Jon. You know I love it when you take me in my pussy, mouth and ass at the same time, or when you have all your slaves blow you at once. Or what about two weeks ago, when you had five of each of Becky and I feeling each other up. I mean, it's just so great being in multiple places at once!"
"Yeah, I know," said Jon, mystified as to why he would say things like that. Then he got another idea.
"Lucy, I can swap around the direct mental control of my bodies and those of my sex slaves. This also does not affect any of my other powers in any way--the bodies I control are the ones that can use my powers."
"Of course you can! You go into our bodies all the time to get into exclusive clubs and recruit whole harems of new slaves for your pleasure. And it's great being in yours--but we all know who's always in control."
Well duh, thought Jon. He did that sort of thing all the time. One time he'd even taken over all of his slaves' bodies, leaving them all as disembodied minds for a while.
Plainly more tests were required, as clearly his power hadn't worked so far.
"Lucy, I can detach and reattach the body parts of any of my bodies or those of my slaves without causing any harm to such. I can reattach them to any body I want, anywhere I want. I can also choose who controls any body part on myself or my slaves, and who receives sensory feedback from any such part. I can also remove and switch interior organs in this way. This in no way affects any of my other powers."
"Jon, don't you remember when you tightened Karen's pussy and drove your dick in to the hilt, and made us all feel the sensations from both? We never quite understood until then the attraction that presented to you."
Looking up from Zoe's wet cunt, Sarah moaned, "And don't you remember when you detached all our sexual parts and stuck them onto one body of mine? Then you screwed it silly."
After Sarah went back down on Zoe, she looked up and said, "Or what about the time you stuck my head beside Becky's on her body? I could still control my body, but that was out of this world!"
Jon couldn't believe his power didn't work, and that he was just stating the obvious. Trying to think of what could possibly be going wrong, he idly grew out a few more dicks and stuck them in Lucy's pussy.
"Mm, Jon, that's nice, but could you spare a few for my ass?"
Obligingly Jon made another body for himself on the other side of Lucy and stuck two dicks in her butt. He also made a pair of volleyball-sized tits appear on her back and, growing the ones on her other side to the same size, began sucking on them alternately.
Tuning in on Becky and Karyn, he could tell they had discovered his little surprise, as they lay next to each other French-kissing and groping each other's tits, while the tongue in Karyn's pussy frantically licked Becky's. Smirking a bit, he turned the tongue into a long, sensitive cock, and enjoyed the feeling of surprise that washed through them as it came unexpectedly.
Then Jon had another thought. This time, it was so crazy, he'd have to know that his wish worked!
"Lucy," he whispered from behind, "my sex slaves and I are invulnerable to everything and immortal. We can literally go anywhere in the universe and survive, do anything and leave with nary a scratch. We only age if and as much as I want us to."
"Jon, why do you say these things? You know that just last night you were screwing my brains out in a black hole. I mean, this is, comparatively speaking, pretty mundane."
It was, thought Jon. Oh well. He'd make it up to her next time.
While Jon loved having his own ever-growing, infinitely-customizable harem, he could only think how much better life would be if his wishing rock had actually granted his wish.