Inky let out a groan as he woke from his sleep, squirming a little underneath the weight of whoever was on top of legs and prodding his chin. "Nngh... 'm up, 'm up, stop poking me..." the black-and-tan-furred rabbit grumbled, tugging his hands out from under the covers to reach up and brush away his red-tipped black hair, rubbing his eyes with his hands. "Get off me..."

They didn't, and as he shook off the sleepiness, he realized how odd it was that someone was on top of him. He was at home, right? And fuck, he was horny; he must have been having a really good dream because the tingling in his loins was immense. Yawning, he opened his eyes a crack...

...and found himself staring at the tip of his own engorged, pre-leaking cockhead, inches from his face.

"What the fuck?!" Inky blurted out, his eyes snapping open. He threw the covers off of himself and stared in shock; sure, he was pretty hung, but not like this! His shaft was over half as thick as his torso now, and it gave a heavy throb as he stared at it, lifting up and then flopping back down against his front, jutting out from the top of the maroon boxers it had escaped from. But past it was an even bigger problem: the weight he felt on top of his legs wasn't another person, it was his own absolutely gigantic ballsack! The nuts within usually stretched his boxers at least a little, but overnight they had grown to such massive, swollen globes that they were stretching the spandex to its absolute limits, his enormous balls resting directly on his legs, practically pinning them down under the weight.

Inky shook his head as he tried to sit up. This was still a dream, right? He was still sleeping, right? But he pinched an arm with one white-furred hand and found he was still most certainly awake. With great difficulty he managed to sit up, struggling to move his legs underneath the immense weight of his massive sack, his cock bobbing back and forth with his movements as his nuts rolled around in his lap.

The handle of his bedroom door turned and the door itself opened a crack. "Hey, little bro, are you-..." the voice of his sister Bun began, but then it trailed off. "...oh," she said simply, slipping inside and then closing the door behind her. His older sister was already up and dressed in her usual attire of a pink and light purple pair of jeans with a matching top that left her midriff exposed, her whole body divided into two colors; black on the right and orange on the left.

"What..." Inky gasped out, barely able to comprehend what was going on. How could she be so calm about it? Gesturing with both hands towards his dick, he demanded, "What the FUCK is this?!" with his cock giving a well-timed throb as he did, a thick bead of precum leaking out and running down the head of his shaft.

Bun gave a shrug. "Your dick?" she offered sarcastically, licking her lips as she eyed him up, one hand resting on her waist as she swished her hips back and forth.

"Well, yeah, but how'd it get so... big?" He gave himself another look; 'big' didn't even begin to cover it: it was thicker than his arm! "And look at these!" he added, gesturing to the massive, churning orbs underneath it that were somewhere between basketballs and beach balls in size.

"I'm surprised it took this long. Didn't mom tell you?"

"Tell me... what?"

Drawing closer, Bun reached out with one hand and patted the front of his gigantic sack. "This happens to all the guys in our family when they come of age. I thought you knew."

That didn't seem right; he'd never seen any of the other guys in his family like... well, like this! None of them had dicks that could break down a door or balls like a beanbag chair. "But... I..." he spluttered, then shook his head to clear it and looked up at Bun in a panic. "I can't walk around like this! I don't know if I can even stand up!"

"You shouldn't have skipped leg day," his older sister teased. She was rubbing in a little circle now, her eyes drawn to the cock in front of her, giving it a hungry look.

"Uh... s-sis..." Inky stammered as he watched her bend over the side of the bed, drawing closer to his loins.

"Shush, let me help you," she crooned to him as she brought her other hand to his balls, sliding down with both palms to stroke them through the boxers covering them. A shiver ran through his body as she caressed those potent nuts, his cock giving an appreciative throb as well, firing a splurt of preseed into the air that landed on the floor past the end of the bed.

He was about to ask what exactly she meant by 'help', but she cut him off by leaning forward and pressing her whole upper body into his balls, reaching around and hugging this enormous ballsack with both arms, her hands stroking the back of his nuts as she smooshed her tits up against the front of them. "Wow, you must be REALLY full," she observed as she pressed the side of her head and one long ear against his sack, lowering her arms to heft those two virile orbs and roll them about. "I can hear them sloshing around..."

Inky shivered again, hands gripping at the mattress cover as his sister teased his churning balls, gritting most of his teeth while his two front incisors hung over his lip. He definitely felt pent-up, that was for sure; even though he'd jerked off before going to bed the previous night, it felt like he hadn't cum in weeks. "I've gotta... gotta get back to normal..." he groaned out to her.

She didn't answer at first, indulging herself by stroking and caressing those nuts as she hugged them to her front while they radiated heat against her. "Well, that's easy enough," she informed him eventually, lifting her head and peering around at him past his throbbing cock. "You've just gotta cum."

Easy enough for her to say... but as ludicrously virile as he was now, it would make a mess of everything. His pre alone was already approaching the total volume of some of his cumshots as more of the clear fluid splattered on his bed and the floor from the attention she was giving to his nuts. "How can I...?" he began.

"Don't worry," she told him as she moved back, giving his balls a final pat with both hands. She slipped away from the bed and reached for the corner of a rug by his bed, pulling it aside and revealing a floorboard with a ring attached to it. She bent over to pull on it – making Inky squirm as he tried and failed to not stare at her ass – and pulled up to open a trapdoor with a hook on the underside. Hanging from the hook was the end of a big clear hose with a cable running along it, connected to a big black cylinder on the end of the hose, with buttons and lights on one side of the smooth plastic surface.

"What's that?" Inky asked as Bun pulled it off the hook and turned back to face him. By way of an explanation she turned it in her hand to show him the end of it; the inside of the cylinder seemed to be lined with a wavy wall of soft silicone.

She reached out for the tip of his cock with her free hand and pressed her palm against it, smearing his own pre all over the tip. Shivering, his toes curled from the shock of pleasure he felt from that, groaning as she slicked up first his glans and then the top half of his throbbing dick. Groaning wordlessly and tipping his head back as he closed his eyes, he was taken off-guard when she pressed the end of the cylinder against the tip of his length and started pushing it downwards.

"Aaaahhhn!" he moaned out with another shudder as the tight tunnel engulfed his cock, slicked up by his own pre and whatever slippery substance the device seemed to be applying to itself. His shaft was so huge that the cylinder only got two-thirds of the way down his length before he bottomed out in it, feeling his cocktip bump up against something firm. With his increased size evidently came increased sensitivity; the squeezing around his dick from the tightness of the sleeve around it felt way more intense than anything he'd felt before.

And then Bun turned it on.

Inky registered a plastic 'click' just a moment before the machine she had connected him to whirred to life, gently clamping to the sides of his length just beneath the crown of his cockhead. He tightly gripped the bed with both hands as he bucked his hips upwards – or tried to, with his massive balls still weighing down his legs – when the machine started to milk and massage at his shaft, the silicone walls rippling and squeezing his sensitive flesh. Thick bursts of precum shot into the end of the milker and were sucked away down the tube, and Inky squirmed on the bed in pleasure, panting and moaning aloud.

"Where... where's it going?" he managed to gasp out as he opened an eye just enough to see another big splurt of preseed get sucked down the tube.

"Storage tanks in the basement," Bun remarked casually as she started to climb up onto the bed in front of him, getting on her hands and knees. "I can sell it later."

"Wh-"

"Less talking, more moaning," she insisted, and to drive the point home, she leaned forward and buried her face between his churning balls, reaching out with both hands to embrace them once again. Inky sucked in a breath and moaned out again as she tended to his nuts while the milker continued to tug and massage his shaft, losing himself in the pleasure of getting jerked off by the machine and having his sack worshiped by his sister. She rubbed her face against those enormous orbs as her hands spread out to stroke up and down their sides, sliding underneath to caress the back of them, then came back around to the front, leaving no part of him untouched for long.

He lay back on the bed and panted for breath between his moans. He could feel himself throbbing within the tight tunnels of the milker, each heavy pulse of his cock sending another burst of pre down it, each one bigger than the last. His sister began to kiss his balls through the straining spandex covering them while her hands kept playing with them, the sloshing and churning of those virile orbs getting louder as he got worked up further and further.

"Here, let's turn it up a notch," Bun said as she took her attention away from him for a moment, and before he could say anything, she pressed a button on the side of the milker. It gave a beep of acknowledgement and Inky gave a sharp moan as its motions on his dick intensified, the walls within rippling upwards in a constant sucking motion over his shaft. Bun was quick to return to playing with him too, stroking her hands in big circles over the front of his pulsing and churning nuts, which only seemed to be getting heavier from all the cum building up inside of them...

"Uuhhhn, aaaah, I..." Inky groaned incoherently, his eyes fluttering every time he tried to open them. All he was aware of was the intense pleasure of his cock getting milked and his sister worshiping the massive cum-tanks resting atop his legs, feeling her hands stroking over their curves while she nosed and smooched at them through his boxers.

It was too much, overwhelming his senses, and he panted and clutched at the bed as he felt his orgasm building – and a big one, from how intense the mere tingling approach of it felt in comparison to normal. "Nnnh, I, aaaauuuaahh...!" he tried to moan in warning, but he couldn't even form words.

Shuddering heavily, he moaned out as his climax hit him like a truck. Intense euphoria overloaded his brain as his cock pulsed and throbbed against the milker around it, the underside of his dick swelling out as his balls lurched upwards in their sack against his sister's hands and face. A massive gout of thick, white cum blasted into the milker, swelling out the sides of the tube briefly from the sheer volume of it, multiple entire seconds passing before the eruption ceased. But that was only the first shot; as Bun continued to lavish his orbs with attention and the milker kept tugging and rippling over his length, Inky's massive nuts pulled up towards him again to fire another potent wave of hot cum down the tube.

Again and again he blew massive ropes of jizz that were sucked away by the machine, lost in the ecstasy of the longest and most intense orgasm of his life. For minutes he lay there as his balls fired great blasts of seed one after another, churning so loudly he could hear them over the hum of the milker, his own moans, and his sister's encouraging humming as she tried hard to keep her face pressed between his nuts, cupping and stroking and rubbing them.

Even when he felt himself coming down from his peak, several more eruptions of cum were drawn from his cock and sucked away. He groaned out as he felt over-stimulated in the wake of his climax from the machine continuing to milk him, but it seemed to detect the end of his orgasm and slowed its motions to a stop, giving a few short beeps.

Dazed, he gradually became aware of the lack of weight on his legs; it seemed like he had finally gone back to normal. It wasn't stopping his sister from playing with his balls even though they were now merely the size of melons, but she soon eased off on him, continuing to rub and tease at the side of his balls with her left hand, making short gentle strokes just to give him a light after-service.

Her right hand reached up and tugged the milker off his cock, letting his now-limp shaft flop against his legs; it was also back to his normal length, almost reaching his knees. He let his head rest back on the pillow again as he panted in recovery, basking in the afterglow from his intense climax, no longer feeling pent-up and horny.

"Feeling better?" Bun asked him, reaching under his balls and cupping one of them, rolling it about in her palm.

"Mmm-hmm," he hummed in reply with a little nod.

"Good," she told him. He gave a little smile and relaxed, but his eyes snapped open when she added, "I'll come by each morning to do this again..."