It's only fair—he'd argue it's even ethical—that the usage of any new form of technology be tested in a supervised environment before applying it to a broader audience. Of course, this isn't the intended purpose, but it would be irresponsible for William to not test out the extremes of a new tool.
At a low frequency and volume, the sound is just enough to implant the suggestion to have a good time into still-developing brains. Adults can't hear it, but their kids do. It dampens any negative emotion towards the animatronics, rigged games, or mediocre food, and heightens their excitement, makes them beg their parents to bring them back for another fun night at the pizzeria.
But as it turns out, at a high enough frequency, it becomes less a suggestion and more of a commandthat overrides brain functions in ways William can't explain. And that's a problem. Absence of understanding means it can be exploited—accidentally and otherwise. He employs enough numskull teenagers to see the issue.
However, an issue on one front can be a blessing on another—if the way Elizabeth's cunt squeezes his cock is any indication.
It's early enough that the restaurant is still closed, the only living bodies inside it being William, Elizabeth, and little Charlotte. Henry is out and about and asked William to keep an eye on her, and William in turn asked Elizabeth if she'd be alright skipping class to babysit. The answer had been a resounding yes, the thought of having unsupervised free reign of the pizzeria alongside her honorary cousin trampling any academic anxiety.
They're close enough in age, Elizabeth barely three years older than Charlotte, that he knew the trouble they'd get up to was negligible so long as he kept the doors to the outside world securely shut.
An hour into tinkering with the barely audible tone, he glanced at the security cameras. His heart nearly stopped at the sight of both girls standing in the middle of a party room, stock still. They answered his questions, swore they were alright, but they weren't moving, said they felt funny and couldn't.
Curious.
Back in the office he tweaked the tone, adjusted it over the pizzeria's speakers and was, frankly, astounded by the effectiveness. He was dumbfounded twice over when he realized neither had any sort of recollection of him asking them any sort of question.
So maybe this method of testing is a bit...extreme, but William swears he's only doing it out of commitment for children's safety. What if any of those perverted high school boys realized it? What would they do?
It's best if William is the one to push boundaries. He is, after all, Elizabeth's father and Charlotte's honorary uncle. He loves the girls, and wishes no harm on either of them. That he gets to derive pleasure from this test is only fair considering how selfless he's being.
Elizabeth's yesyesyesyesohyes as she bounces on his cock makes him the hardest he's ever been before. She's kneeling on his lap, her cute little body completely naked save for her shoes. Her eyes are wide and glossy, hands on her thighs as she rides him, her pigtails flailing. William's hands are on her waist, urging her to keep bouncing.
He's sitting on the floor with his back propped up against the couch in the back office. He's killed every security camera and commandeered the monitors to play slow moving spirals that match the tone whose frequency he increased. He too is naked, because he's secretly always wanted to feel sweaty, young skin against his.
William had never thought about these two in that way, but, when the opportunity presents itself….
Charlotte is also naked, kneeling next to William and placidly watching Elizabeth "ride a horsey", like William told her they were doing.
"It feels very good," William says sternly, "taking Daddy's cock."
"It feels very good," Elizabeth drones with a giggle, a bit of drool escaping the corner of her mouth. "I love taking Daddy's cock."
William grunts. She's so fucking tight that it almost hurt when he first penetrated her, but now that her cunt is lubricated because of how good she feels, the tightness borders on madness. He fears that, after this, once he's fucked them both, he'll never be able to get off inside anything else.
"Moan for me, Elizabeth. Make all those sweet noises that say how good your body feels. Be loud." There are no words, just nonsensical noises that boil down to moans, whines, squeaks, and giggles.
He tips his head to the side. "Charlotte, why don't you come here and give Uncle Bill a kiss?" Charlotte scoots over and pecks his cheek. "On the mouth, sweetheart. Kiss my mouth."
She straightens up and puckers up her lips, tips over and presses their mouths together with a giggle. No hesitation, no stating how Henry told her that she should never kiss a grown-up. That no grown-up should see her naked, or touch her private parts.
William reaches down and traces the tip of his finger up the seam of her puffy pussy lips. "Lick my tongue like you would a lolli," he commands, sticking his tongue while he pushes a finger inside her. Charlotte makes a little noise at the intrusion but does as she's told, messy but enthusiastic. "Suck on it," he says breathlessly, fingering her fast enough that she starts to hump his palm.
With Charlotte sucking on his tongue and Elizabeth fucking herself on his cock, William briefly wonders if he's stumbled onto some form of paradise. It feels so mind-numbingly good, his nipples hard and his balls so full. He pulls Charlotte closer by the finger in her cunt, forcing their mouths together so that her sucking feels more like kissing. His free hand gropes Elizabeth's chest, squeezing her undeveloped tits.
He thinks it through. Withdrawing his finger from inside Charlotte, he wraps that same hand around the back of her neck and directs her towards Elizabeth, making sure her mouth presses against his daughter's nipple. "Keep sucking on it, Charlotte."
Elizabeth moans louder, stops bouncing to grind on his cock instead.
"That's it, you're both doing such good jobs playing together, my little angels." William pulls Charlotte back to suck on her tongue, unsure of what he likes better: her small tongue in his mouth or Elizabeth's nipples in her mouth. Both are equally obscene and make his cock throb.
Getting old does have its benefits, he thinks. Were he any younger, he's sure he would have cum the moment his tip touched Elizabeth's body, but now? He can enjoy himself at his leisure, draw out the pleasure that comes from fucking his little girl and his best friend's daughter before any other man so much as thought about doing such a thing.
William moans into Charlotte's mouth. "Do you like it when I touch your private parts? Does it feel good?" She nods. "Are you gonna tell Henry that Uncle Bill touched you? The he kissed you like a grown up and put his penis inside your little pussy?" She shakes her head. "Do you want me to put my penis inside you?" Charlotte hesitates before shaking her head. William smiles. "Yes, you do," he murmurs sternly. "You want me to fuck you like a man fucks his obedient wife." She blinks, and nods. "Good girl."
He gestures for Elizabeth to get off, and her compliance fills him with satisfaction. "Get on the couch, and lay down on your back." She does as she's told.
He takes Charlotte next, forces an open-mouthed kiss before picking her up and laying her on top of Elizabeth. He spreads her legs to make her straddle his daughter, and with a hand on her flat rear he presses her down to make their mounds rub together. Both girls moan, and William's balls manage to feel heavier than they've already been.
Elizabeth grabs Charlotte's hair and holds her in place in order to kiss her, her hips working upward to make sure they keep rubbing together. Charlotte's hips also twitch when she realizes how good it feels, and desperately tries searching for more of that warm pressure.
William watches them as he strokes himself, the sight of two naked little girls kissing and humping the single most arousing thing he's ever witnessed. He's breathing hard, cock thickening between his fingers until Elizabeth grabs Charlotte's ass and tries to pull her tighter against her.
Both their smooth cunts are glistening and he can't help himself. He's already been inside of Elizabeth, so it's only fair to share the blessing of his adult cock taking Charlotte's virginity too.
He kneels on the couch and spreads Charlotte's legs. Her cunt resists that first push but once he pops inside of her, it's a race against time before he cums.
She's so much tighter than Elizabeth. She tries to complain but he pushes her head down, forcing her to keep kissing the girl underneath her.
Now this, this is the best fuck he's ever had. He thrusts in and out of her as quickly as her body will let him, skin slapping skin when she's widened and slicked enough to let his cock slide with ease. He pulls out all the way only to slip inside Elizabeth's cunt, work a couple of quick, sloppy thrusts before swapping it for Charlotte's.
"Who wants my special milk the most, I wonder," he says, dipping into either girl in equal measure. "My slut daughter who can take Daddy's cock whenever I want, or Henry's precious little girl, who I'll have to sneakily molest." That answers his own question.
"Keep kissing," he hisses, hands on Charlotte's tiny hips as he angles himself to fuck into her in earnest. "Keep rubbing those pretty little cunts together as I empty every last drop inside of you, Charlotte."
He slams into her over and over wishing this could last forever, and when he cums, he gives her most of his hot semen before pulling out and sinking into Elizabeth to share the wealth.
Now he's marked them both, and the thought makes his still twitching cock jerk.
Once the last drop is spent he plucks a sweaty and panting Charlotte off of Elizabeth. He sits on the touch, and commands each girl to sit on his thighs with their backs towards him. When they do, he nudges their legs open and smacks their dripping cunts, slips a finger into each of one to feel his seed swimming inside of them.
"Give me a kiss, girls," he commands, sticking out his tongue as he fingerfucks them both. The two of them squirm and moan and pant, pressing all three of their tongues together in a sloppy mess of spit.
Thumb ruthlessly rubbing their clits, William gets hard again.