Size Matters
A bunny couple regular partake of the National Body Part Exchange Registry to try new genitals. But getting random parts means sometimes things are too big to handle.
A NBPER Story (maybe more to come)
N.B.P.E.R.
Size Matters
John and Amber stood at the table, looking down into the box on the table. For a few seconds, they just sort of stared. Amber was the first to speak what they both were thinking. "Are you fucking kidding me?"
3 Years Ago
The couple's adventurous side began shortly after the start of their marriage. The pair of bunnies loved each other very much, and they went to having fun constantly, but John couldn't do much to satisfy his wife's size queen desires. Being a 3-ft tall bunny had its limitations and John was hesitant to let others come between them in the bedroom.
Their solution was the National Body Parts Exchange Registry. The organization had only been running for a few years, but they had heard nothing but good news about it. People used it to help become "their true self," but who was to say they couldn't use it just experiment a little bit?
Several signatures and weeks of waiting later, and John had a new set of cock and balls delivered. They had opted for an entirely random selection for what species he'd get; the new bits were from some sort of dark-furred feline.
It took several long minutes of holding the somehow-enchanted blade for John to work up the courage to cut himself, though. Partially from arousal and not wanting to miss the cut and the other from nervousness. But he'd already signed his parts away, so keeping them would mean federal charges on "theft of government property." So he had pushed himself to drop the knife and painlessly sever his sheath and shaft and balls from his crotch. The erect member slowly died as it flopped to the floor and he ran a hand along the smooth Ken-doll crotch.
Amber didn't give him long to adjust to the feeling and quickly pushed the new set home. The black fur was a stark contrast to his own white, but the flesh somehow melded together seamlessly. He gave a gasp as a rush shot up his spine and he felt the knew weight settle into place. Just the sheath and balls were quite a bit larger than his own. "Damn... That feels.... Pretty good, actually..."
His eyes shifted between the two male packages that had now been exchanged, and his arousal transferred to his new shaft. Compared to his old 3-inch length, this one was almost double that at 5.5 inches. As his wife stroked it, his breath fluttered. The sensation was both alien and wholly pleasurable. The barbs were a whole new thing unto their own.
Amber ran her tongue up along it and hummed blissfully. "Yes.... This will do very nicely~"
So, the couple experimented and grew. The minimum time they could keep each new set of genitals was 6 months. It was like a small version of Christmas. Twice a year (usually) they would sign in at the registry, get sent a new random set of genitals, and swap out the old set. Feline, canine, an adventurous period where they somehow received a reptilian hemipenis in a slit (John occasionally missed getting to solo DP Amber), and one interesting time he was sent a cut-off vagina. That one they ended up keeping for 8 months so both could play around with being the bottom, but John did eventually missed the feel of being truly male.
All of the cocks they had received had been modest. Big, but not uncomfortable for Amber. The worst thing for them was occasionally needing to buy baggier pants for work and needing to be careful in bed, but his wife could pretty well take almost anything they were sent.
Until today.
John reached in and ran his hands over the black cock inside of the box. It was as thick as his arm and just as long. The way the tip was shaped, he could tell that the thing was technically still soft or at least half-so. On one side, a massive pair of veiny testicles were spotted with thin, wiry hair.
It was the single biggest horse cock that John had ever seen. Even in porn, this thing would be impressive. And they sent this to a bunny!
Amber looked between them and brushed his arm. "Do you... think there's a mistake?"
"It's a random draw. Not really a mistake if it's random," he answered. He did his best to grip the thing and lift it. It was something like 10 pounds of meat and he had to strain a little bit to heft it out of the box. He lowered it just in front of his crotch to get an idea for the size. The testicles and floppy member hung to his knees. Based on knowing his own size, the cock had to be a foot and a half long, just under half of his entire height not including ears.
He rolled it over in his hands a moment and set it back on the table. "What do you think? Worth doing?" They still hadn't cut off his own current set yet, a golden canine sheath. He didn't like the knot on this one, so had been eager to trade again. Now he had doubts.
Amber was clearly debating it in her head. "It's fucking massive... Even with all the training we've done, I'm not sure I'll be able to take most of it. But I'm willing to try." Her eyes turned to him. "Do you think you can carry it? I'll need to go buy you new pants."
He gave a nod. "I mean... Yeah. It's not that much weight... If we can keep me from knocking into things, I think I can do it." Moving easily would be a whole other problem, but he could see that hint of excitement in his wife's eye. He wouldn't want to take this from her.
She instantly smiled and went fishing for the knife. "Alright, then. Let me butcher my bunny~"
He laughed and sat down in one of the table chairs with his legs spread to give her access. She brought the knife in and gently slide it through his flesh. Again, the fur and flesh parted smoothly to just leave smooth patches on both sides. She made a loop following the line of color until the canine shaft fell away.
His hand slid over the patch again to tease the strange feeling of emptiness there as she set his old thing aside and lifted the new one. He helped her so they could do it properly and guided it to place. As soon as the flesh touched, he shivered again. Hanging off of the chair, he could feel them pulling his crotch, and he had to fight a little just to stay up. "Oh, fuck..."
His wife's hands slid along the shaft and he suddenly gasped. The thing felt sensitive, but every cock did at first. The difference with this one was that there was SO MUCH of it. Her hand moved down for what felt like an eternity just to reach his tip. As he sat there, he could feel the blood in it surging and pushing to stiffen the rod and get it up.
Both of them watched as the cock hardened slightly, but never quite got entirely rigid. It would stay in place, but Amber had to keep a hand under his tip to keep him level. "Man... this monster is going to be fun."
"Yeah... Starting now~" John suddenly stood and pushed against her, softly knocking them both to the floor. They giggled as he shifted around on her and kissed. The cock sat between them as she held him. A few idle grinds got it moving along her crotch, her belly, between her breasts.
They kissed for several minutes before he leaned back to get better leverage and began humping in earnest. Her arms wrapped and around the shaft to hug and rub its top while the underside slid along her fur.
The first time using a cock was always quick as he got used to the feelings, but this one had so much driving the poor bunny's brain that he started to peak after what felt like only seconds. "Amber... Here... it comes..."
He panted and groaned and started to spray mid-thrust. And it was literally a spray. A full second of shooting a heavy but thin load of milky cum up his shaft right over her chin. She gasped and squirmed and squeezed as the cum dumped out onto her face and ran along her neck.
The feelings left John without thought as he felt the torrent flow. It just kept going, even after he should normally feel it stop. So he just kept enjoying it. He didn't hear anything from Amber about it.
When he finally did come down, his eyes opened to look, and he froze for a second. The floor of their dining room was almost completely coated in cum. Amber's face was covered except the topmost part of her head. The two panted for a few seconds as he settled from the high and they looked at the mess. When they finally locked eyes, she giggled. "Yeah, we'll have fun with this~"
That first day with the cock was quite a learning experience as they went about cleaning up the mess. His tip didn't fully stop oozing for another 5 minutes after cumming for a full 3 at first, so it was a hell of a mopping job. Thankfully, the shaft did eventually reduce to a level where only the flared tip was outside of the sheath. The balls, however, were so thick and low that he waddled to not pinch them.
Amber wanted another try at it that night. With how long it took them to fix the first mess, they agreed doing it in their shower was probably the best choice. A blanket helped keep them warm from the tile and it was large enough to not restrict them.
As usual, they started with some light foreplay and kissing and the oral that they both loved. Sadly, the head was way too much for Amber to properly fit into her mouth, but she could let her lips and tongue work the head and flare. That flare was especially sensitive for him and feeling her tongue swirl around the rim made him tremble and his toes curl.
The pair grabbed lube for the real test. He worked his own tip well and gave it a squeeze to test its flex. Meanwhile, she rested in a missionary position and watched while rubbing her own slit and clit with lube. As he put the fat head against his wife's crotch, he watched her face. She just nodded to him eagerly but nervously.
They pressed. No luck. Again, with his hand squeezing it. She grimaced a little bit at the pressure. It was definitely too big to...
And then with an audible squelch, he pushed into her. They both gasped and groaned a second, her from the feeling of her pussy stretching wider than it ever had and him from feeling the almost uncomfortable squeeze to his tip. Both of them froze and panted as they adjusted to the feeling of it.
He recovered first and reached to brush Amber's side. "You ok?"
He waited patiently for her to take several deep breaths. "Fuck, it's so big..."
That drew out a small chuckle. "Yeah, but we knew that."
She retaliated by slapping his shoulder and that made him only laugh more. They waited for a few long minutes as he lovingly rubbed her and waited. Then she gave a nod and he went back to gently pushing with one hand holding for support.
It seemed the initial push was the hardest part of it. Now that he was in, she had her passage open to him. It was still slow going at first as he drove and she panted and moaned from it. He knew it was too deep when he felt sharp resistance and she winced in pain. After a quick check, he saw what he could do. A third of the total length.
They settled back into a comfortable rest and he leaned down to kiss her. "Feel good?"
She nodded as she shivered. "Yeah... Real good... Like I'm about to tear open. You?"
"Great. The tip is super sensitive, so... I think I could get off with just this."
"Good..." Amber took a deep breath and leaned up to kiss John long and deep. She broke the kiss with a growl. "Then wreck my bunny pussy, you fucking stud!"
And he obliged. It was only several inches of his length, but it was enough for both of them. She rubbed her clit as he humped and visibly distended her belly with the tip of it. His spare hand held and rubbed the lower part of his shaft to add pleasure, but the tightness at his head was his driving force. She came first and arched her back a little as she spray fluid with a cry onto his length.
The angle pushed his head upwards into her belly and he grunted. A few thrusts later and he sprayed her back. It must have hit something inside of her, because she instantly cried up and tensed again in what seemed like a fresh orgasm. He saw the spray push her belly up and flesh ripple with the power of the load. Then it smoothed as her body swelled up a little with the volume of it.
He held it for a few seconds, grinding in pleasure as he watched, until she shifted and pulled back a little. "Out.. too much..."
His body instantly pulled back, dragging the flare of his tip the entire way. They both moaned out in unison as the tip held at her entrance for a second and them popped free in a spray of cum. His hands took over rubbing at his length and tip as the climax went on and he literally showered his wife in the fluid. She relished it, though, and went to rub it into her fur as she fingered her loose and draining hole.
He came down finally well after she did and looked to admire what he'd done. Her slit had a modest gape to it and was oozing cum. The shower was coated and the blanket soaked. And his wife was in the middle, smiling and giggling like a school girl with a belly that looked like she'd eaten a melon.
He laughed with her and lowered himself into the mess to hug and squeeze her. "I love you," he whispered softly.
She squeezed him back and kissed his cheek. "I love you, too."
The months passed, and in time handling his new meat became easier. They found some custom underwear and pants that could keep the package mostly out of the way. It still left him with a crazy-big bulge, though, to the point that he had to be careful when walking down the street and sitting at any sort of table. Having nuts as big as your head meant you had to be careful with tucking.
Work was also a fun adventure the first day he went back in. Everyone gave him an eye, but he wasn't the first employee to be using the Body Exchange. Still, he had to admit some of the comments were flattering. If he wasn't so dedicated to his wife, he would probably get in trouble with management for sex in the workplace.
Their time in bed gradually got easier too. Her slit opened up more easily, though her cervix forever restricted him to those 6 teasing inches. Soon they could go for a dozen minutes easily, and she'd be left with a heavily gaping hole he could finger and literally eat out of.
When the window for exchange opened, the two lay in bed, again with the half-hard cock flopped between them. No sex, just an intimate cuddle between lovers. John enjoyed the feeling of it there, already ready to ship it off and try the next one. He drifted to sleep, wondering what his next cock was going to look like.