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Lucas already gotten used to being the master's fucktoy. He learned to put up with the talk of "breeding him nice and pretty," he'd barely cried when his clit had been pierced with a tag marking him as the master's slut, he learned how to be a good little cocksleeve and let his cunt do the thinking for him when his master found a new toy to test on him- always his cunt, never his ass or his mouth yet, which he supposed he should be grateful for. He wasn't allowed to speak, so he had learned to make pretty noises to express himself, particularly when being fucked.
So when his master had told him he wanted to "show off his pretty little slut" he'd figured they were all going to take turns fucking him, and had mentally resigned himself to that fate. What he didn't expect were the three large jars filled with glass balls of different sizes- one containing small beads the size of a marble, the second about the size of a walnut, and the last being the largest, the balls within all the size of an orange.
At first Lucas had assumed they were all just for decoration- he'd seen something like that at his grandma's place before. But then his master tied him spread eagle on the couch, legs bent at the knee and his cunt in plain view for all the hungry eyes on him, and the master turned to the other men with a grin.
"My slut's got such pretty holes, huh? But see, I've only used his pussyhole so far."
Lucas had paled at that. He should have expected his master would want to fuck him anally eventually, but he'd gotten complacent. Was his master going to make a show of taking his anal virginity? Was a complete stranger going to do it?
But before he could wonder much more, his master continued. "So I've devised a game to see if we can break all three of his holes in, test his limits and see much he can take." The man picked one of the small beads from the first jar. "The rules are simple- everyone takes a turn stuffing his holes with one- One- of the balls here. I have a jar for his pussy, his ass, and his urethra." An eager murmur rose from the gathered crowd as Lucas inhaled sharply. His urethra? No. No, he couldn't-
"Like so!"
His thoughts were cut off as something cool and smooth pressed against the hole in question, and a choked sound escaped his lips as the master pushed the marble with enough pressure to force it up into Lucas' urethra. That tiny passage wasn't meant to have anything stuffed inside it, and now the tiny marble felt absolutely massive inside him. And yet the pressure rubbed his clit from the inside, leaving him with a strange, hated pleasure.
The master turned back to the crowd with a grin. "There's also a jar for his cunt, and a jar for his ass, as you can see. The last person who can get a sphere in one of his holes gets to breed him. Just don't tear him- I want him to enjoy this."
Enjoy this? They get to breed him? Lucas shuddered. There was no way for him to escape this, was there? They were going to break him, and all he could do was take it.
The first man to approach him chuckled, giving the tag on his clit a flick and making him yelp. "Your little slut, huh?" he commented to the master.
"That he is!" the master said proudly. "He cums beautifully, hopefully you'll see it tonight."
"Well, maybe I can help him out a bit." With that, the man pressed yet another marble against Lucas' pisshole. It was still partially stretched from the first marble, so it went in more easily, and the boy keened as it it pushed against his clit.
A couple of the men laughed. "He makes such pretty noises, doesn't he?"
"He's like a little bird!"
Lucas twisted his head to try and hide his face against the couch, only to gasp and moan as something cold and wet pressed against his asshole. One of the men had coated one of the larger spheres in lube, and was pressing it in slowly, insistently, watching the boy's untrained asshole slowly open under the pressure, visible through the clear glass. "Look at that, I can see deep inside him!
Lucas whimpered as a few more men crowded around to get a look inside his ass, and gasped as the orb was finally, fully shoved inside. He wanted to push it back out- god, he could feel the size and the weight and he wasn't sure how to feel about it. The master had put him on a liquid diet for so long, so at least he was clean back there, he supposed.
The next two balls being pushed up his cunt were a relief, the familiar feeling of having his pussy stuffed a welcome one. He clenched around them, feeling their weight, his breath hitching as they bumped against the balls in his urethra and ass through the walls of his cunt.
Then another person slipped a marble up his urethra, drawing another high keening noise as they used their pinkie finger to push it and the other spheres deeper inside to make more room. Naturally, the next person followed suit- but this time, Lucas gasped as he felt something give, and when the first marble settled in his bladder he knew what had happened. The tiny orb rolling around in his bladder felt strange, bringing a sort of pleasure he had never felt before.
A hand ested on his head and he glanced up, to see the master smiling knowingly at him. "You like how it feels, don't you?"
Lucas keened in the back of his throat, shifting his hips as best he could towards the crowd. His master knew his reactions best, there was no hiding his pleasure. Even as the next ball was pushed into his pussy, he had begun to crave more of the burning pleasure in his tiny urethra- and when the next person slipped another glass bead inside he moaned, trembling from the pleasure.
"It's not going to stop there, you know?" The master leaned close to the boy's ear. "It's coincidence that everyone wants to fill your bladder first- but you have other spaces to fill. Your colon, your womb..." Even as he spoke, someone shoved another large ball up Lucas' asshole, making his eyes roll back in his head from the sheer size. "It really won't take much until the ones in your rectum start getting pushed much deeper, into your intestines even. And even your cute little cervix is gonna have to give."
Unseen to Lucas, the master nodded to the pair of men who had approached together, and simultaneously, they shoved the glass spheres they held in his cunt and ass at the same time. Lucas threw his head back, biting down a scream and whimpering as the men met resistance, but refused to let up, pushing harder until finally, the one in his ass pushed into his colon, while his cervix finally gave way to the first of the spheres in his cunt.
God the feeling of it all, the weight of the glass balls settling in the deepest parts of his holes, the way they rubbed each other through his inner walls- hell, even the way the tag on his clit was jostled every now and then- it was all so much, it was enough to push him over the edge, and Lucas cried out as he came, vision blurring.
Being mid orgasm didn't stop the game, however, another man slipping a marble into the slut's still twitching, oversensitive urethra, drawing another whimper from him.
Lucas lost track of time as sphere after sphere was pushed into his holes, filling him up, drawing orgasm after orgasm from him. His belly now had a clearly visible bulge in it, making him appear heavily pregnant. The orbs in the jars had begun to dwindle, and a couple of the men had taken to playing with his tits while his master stroked his massive stomach.
"Look at you," the master murmured. "Such a good slut for me. So beautiful and full like this. You've never felt this good before, have you?"
All Lucas could respond with was a moan and fluttering of his eyelids as another orb was forced into his colon, past one of the bends in his intestines. The master was right, though. Being this full, having his deepest parts stretched beyond their limits, invaded in a way he never knew they could be... He never wanted to lose this feeling.
"It's almost a shame I promised to let someone breed you," the master went on. "But don't worry, I'm sure we can find more ways to break you even more beautifully."