A totally normal and platonic shower.

Dave stood back and gawked at his sisters as they casually undressed in front of him.

Amy, as she mentioned before, was in her college’s Track and Field program, and it showed. When her clothes came off, Dave took note of her tight belly and toned legs. Her butt was a bit more perky and shapely than her sister’s, as well. Alyssa’s body was softer, but she definitely wasn’t chubby or fat by any means. Her skin tone was ever-so-slightly more pale from the lack of sun, and both of the twins were sporting modest sets of perky breasts.

Once they were completely naked, Dave followed them into the shower, his big dick bouncing from side to side in front of him.

“So Dave, did you take the day off today, or something?” Alyssa asked, leaning back against the shower wall as cold water came crashing down around their feet. “It’s not like you to miss work.”

“Seriously.” Amy agreed, adjusting the metal handle that controlled the water temperature. “And what’s that thing you’ve been holding onto?”

Dave, still a bit distracted by his twin siblings’ naked forms, took a moment to answer.

“Oh, uh… Actually, I quit my job.” He lied. “Wasn’t going anywhere, and I wasn’t making enough money.”

“So not having a job makes you more money?” Amy asked. “No offense, but that’s pretty stupid.”

“Oh, lay off. I’m sure he had his reasons.” Alyssa said, backing her brother up, to his mild surprise. “It’s not like we have money troubles.”

“Coming from you, that’s rich.” Amy chuckled, feeling the water with one hand as it approached their desired temperature. “You’ve had two part-time jobs lined up, and you didn’t show up to your first day of either one.”

“Well, at least I made the effort.” Alyssa frowned and crossed her arms. “You’ve never even had a job interview.”

“Mom said that I don’t have to get one as long as I stay in sports, which you’re aware of.”

Dave stood there silently with his eyes still scanning their bodies, then looked up into Alyssa’s face as she wore an expecting expression.

“Well?”

“Well what?”

“What’s that?” She asked, pointing to his right hand. “It looks like a bone.”

“Yeah, like a wishbone you get from a chicken.” Amy said, walking underneath the warm and steamy water and allowing her slender feminine body to become wet and shiny. “Gross.”

Dave smiled and held it up for them to see.

“Yep, that’s exactly what it is.” He chuckled. “And it grants wishes.”

“Pfft.” Amy chuckled. “You’ve finally lost it, huh?”

“What kind of wishes?” Alyssa teased. “Is that how your dick got so big?”

“Nope, can’t use it on myself.” Dave shrugged. “And you can’t use it without my permission.”

The bone pulsed in his hand.

“Same goes for you.” He said, looking at Amy.

The bone pulsed again.

"Weirdo." Amy scoffed.

“Well, what did you wish for then?” Alyssa continued to tease with a cocky smirk as Amy turned away from them and began washing her hair. “For us all to take a shower together?”

“Actually, yeah.” He chuckled, grabbing his dick and stroking it to full mast. “I’d say it was a pretty good one, too.”

Alyssa looked down at it and blushed.

“Well, i-it’s not weird for family to shower together, but jerking off in front of them is another thing…”

“What?” Amy said, turning around as she rinsed her hair. “Dude, what the fuck!”

“What’s wrong?” Dave asked, still grinning. “You too fuck each other all the time.”

As he was looking at Amy, the bone pulsed.

“And **** is hot as fuck.”

Now looking at Alyssa, the bone pulsed again.

“I-I mean, I’ve never fucked Amy before…” Alyssa began, her uncomfortable expression twisting into a cute and lusty grin of her own as she watched Dave handle his meat. “I’m not against the idea, though.”

“What do you mean?” Amy asked, turning away from Dave’s dick. “We fucked twice already today. Once when we woke up, then cuddled up in the back of my car at lunch and-… Are you okay?”

“I’m fine!” Alyssa said with a nervous laugh. “You’re the one that’s hallucinating!”

Amy looked glanced between them, now more confused than anything.

“Look, I’m into girls, and Aly is like my goth clone, so it’s more like masturbation than **** when we fuck.” She said, giving Dave a look of disapproval. “Sorry bro, not happening.”

“What are you talking about?!” Alyssa giggled. “We’ve never had sex!”

“Are you insane? It’s not like we keep it a secret, so why are you being so closeted about it now?” Amy asked, crossing her arms over her perky breasts.

They both turned to Dave to ask if the other was losing her mind, but her eyes couldn’t help but lock in on his goofy smile before looking down at the bone in his hand.

“Wait a second." They both said. Alyssa looked to where her sister was staring, and the two met each other’s gazes with wide eyes.

“From what I can tell, it only works on one person at a time.” Dave said, holding the bone up. “Also, if I make a change, the person who gets changed doesn’t realize the change, but they can notice that something is different, I think. I’m not exactly sure how it works yet. Mom might've caught on that I was using it on her at some point, but I couldn't tell if she actually knew, or if she was just suspicious."

The girls were at a loss for words, they just stared at him with slack-jawed expressions of disbelief.

"Whatever the case may be, let's test it out." Dave began with a chuckle as he held out is hand to Aly. "Take the bone and tell me that my cock never gets tired and that I've huge balls that never run out of cum, then hand it back to me."

The bone pulsed, visibly but every-so-gently moving.

Without missing a beat, Alyssa stepped forward and took the bone from Dave's hand.

"Your cock never gets tired, and you've got huge balls that never run out of cum."

The bone throbbed in her hand, and she immediately placed it back into Dave's open palm.

During this brief motion, the twins had their eyes glued to their brother's junk. To their shock, his cock jumped with activity and became even harder than it was before, all while his balls quickly grew and inflated into what looked like tennis balls being squished together in a smooth, velvety bag. They both jumped back against the walls behind them, and Dave looked around expectantly.

"Hm." He said, closing the hand holding the bone while his other reached down and cupped his massive and hairless balls, which caused a thick glob of precum to ooze from his flawless cockhead. "Well, I don't notice anything different..."

Dave looked back up with a shrug.

“I remember what I told you to say, but it seems weird now.” He chuckled. “I remember my balls always being like this, so it feels weird that I’d ask for it.”

“Okay. This is fucking-“ Amy began, obviously terrified, but she was cut off by her sister.

“Hot.” Alyssa said, cupping one of her breasts while the other hand was down below rubbing her clit. “Holy shit.”

“You mean scary, right?” Amy asked her sister, who looked at her with wide eyes of sparkling excitement. “R-Right?!”

“No, she means hot.” Dave said, as-a-matter-of-factly. “You think so too. That was the hottest thing you’ve ever seen. Now you’re so turned on that you can’t think straight.”

A brief flash of panic appeared on Amy’s face as soon as she realized the weight of his words, but then the bone pulsed.

The blonde quickly relaxed and bit down on her lip, then started began rubbing her breasts and rubbing her thighs together.

“Fuck…” Amy said, her face becoming flushed as the depth of her breathing began to increase, but her lusty expression still had traces of defiance. “I-I know you did that with the bone…”

“Maybe.” Dave shrugged. “Doesn’t matter now, though. You’re a bisexual pervert, and you’re always horny.” The bone pulsed, and any trace of resistance left in her cute face was replaced by a wicked grin that made her sister’s look almost innocent.

Dave turned to Alyssa, who gasped, but was grinning like a fool as she rubbed herself.

“What do you think, Aly? Oh, who am I kidding. You‘re just as horny and fucked up as Amy.”

The bone pulsed, and the two were looking at their brother with a desire that seemed almost animalistic.

“So, who’s first?”