Attack of the big, bouncy, buggy-butt
Thorax is a king. And like a king, he's supposed to set a good example for his subjects. Indulging in lascivious acts isn't generally what one would consider a very kingly thing to do. Thorax is also a king with many problems to worry about. Like his rising libido whenever his brother Pharynx is around.
The good news is that Changelings are usually very affectionate and master seducers by both nurture and nature. So sexual activity in the hive is never anything unusual. The bad news is that Thorax, in all of his years of living, has never had sex in his entire life. Pharynx, being the good brother he was, was going to rectify this for Thorax.
"No, Bro. I'm not going to have sex with you."
"Why not, Thorax?"
"Because you're my literal brother, Pharynx. That doesn't bother you at all?"
"Nope. Should it?"
"Well, yeah. I'm not going to keep having this discussion with you. Just go find a different changeling to breed with if you're that horny." Thorax then pushed his brother out of his room and closed his door. Pharynx wasn't happy about that.
"I'll remember this, Thorax. I'll make you mine yet. And I have the perfect weapon for the job, too." Pharynx made his way into his room and reached into a wooden chest containing his naughty items and toys. There it was; A potion to enlarge one's proportions. "Perfect. Suppose Thorax won't come to my butt; then I'll bring an even bigger butt to him."
"I can't believe my big bro. He's such a dirty pervert." Thorax was sulking in his thoughts as he lay on his bed, trying to think of what he wanted to say to Pharynx. Then, he heard a knock at his door. "Oh no. Um- I mean, come in!" Pharynx entered his room and closed his door, grinning a smug grin. "Pharynx! What's that look for?"
"Oh, I think you know what I want from you, Brother."
"Forget it! I'm not having sex from you, and that's final!"
"Then I'm gonna milk the pleasure outta you!" Pharynx then gulped down that potion he got from his chest as he then turned around to show off his butt to Thorax. It was starting to contort and expand to gigantic proportions. It was huge now, and it was jiggling as he lightly twerked his hips, his tongue lolling out of his mouth in a wanton display of "I'm gonna fuck you raw!"
"P-Pharynx?! W-What do you think you're doing?!
"What does it look like I'm about to do? I will make my wimpy brother into a real stallion among the hive. Time to pay your debt to me!"
"I-I don't owe you anything, Bro. P-Please, get that giant butt of yours away from me." As it jiggled and bounced, it got closer to Thorax as Pharynx began to moan in lust and climb onto Thorax's bed. "I-I'm warning you, Pharynx."
"Oh dear, you're so intimidating, Brother." With a soft, dense, and meaty THUD, Pharynx's huge ass just sat onto Thorax's lap, enveloping his crotch into the warm confines of his toasty warm buttcrack.
"N-Noo! Aaahh... G-Get off of me, Pharynx!" Thorax was forced to moan lightly as he was forced to feel pleasure.
"I'm gonna start grinding."
"P-Pharynx!? Don't you dare!"
"Here it comes, Bro!" He giggled as he used his hands to massage his buttcheeks, causing Thorax's cock to harden as it got wedged into his buttcheeks. Then, he began to grind his butt into his brother's lap to stimulate him further. "You always were easy for me to bully back when we were both younger, even if it was mostly about me protecting you."
"Aahh!? S-Stop that!"
"Make me, Bro!" Thorax's shaft was firmly trapped in Pharynx's thick buttcheeks, giving Thorax a rough time. "Oh. I think I can feel your head prodding into my rosebud."
"W-Wait, Bro. Stop!"
"No! I'm tired of waiting for you. The only way you're escaping from underneath me is if you blow a nice and creamy load into my ass!" With a meaty and lewd SCHLICK sound, Thorax felt his stiff rod sinking deep into his brother's tight anus.
"O-Oooh... oh my, Faust! His ass is so soft and heavy!" Thorax was moaning and panting uncontrollably.
"Mmm~ You're a girthy boy, aren't you, Thorax?" Pharynx moaned in lust as he began to bounce onto his brother's shaft lightly. "Oh, buck, yes, you were holding out on me. How selfish of you."
"P-Please... mercy, Brother." Pharynx's tight insides squeezed down onto Thorax's shaft like a muscly vise; each bounce created a moan, and each minute spent inside his butt had slowly drawn out some pants and groans of pleasure.
"Mercy? What's that?" Pharynx giggled as he grounded his butt all over Thorax's shaft, bringing him closer to forced orgasm. "Are you even trying to escape back there?"
"S-Shut up, Pharynx. I-It's not my fault that your butt weighs more than three hundred pounds. Augh!"
"The bigger, the softer, the bouncier, the sexier it is." Pharynx then began to grab the soft globes of his ass fat and clap them together to assault Thorax's shaft with numbing pleasure. His right leg was twitching; his breathing was rapid, and his mind was slowly drifting away to bliss.
"Oh buck, I'm feeling something rushing out of me... what is that?"
"Oh yeah. My little bro is getting close. Time to give my butt a nice cream filling!"
"P-Please, Brother. Not like this. I don't want this." Thorax was forced to thrust his hips as the pleasure was too powerful to resist.
"Think of the most delightful thing you've ever felt in your life; that'll be nothing compared to this." Pharynx then mercilessly bounced and pounded his juicy and thick butt onto Thorax's shaft, milking him closer to his first orgasm. Thorax tried to lift his brother's buttcheeks off his shaft in one final attempt at resistance. "Oh really? You think that's going to save you from me?"
"I don't k-know if it will. B-But I'll try it a-anyways." It was a futile attempt, an ungainly effort. Pharynx's butt was just simply too big and too heavy to lift. "N-No... too heavy. T-Too much... ass."
"Just give it up and cum into my butt, Brother!" Pharynx pressed his buttcheeks together to squish them all over his brother's shaft, causing him to convulse in staggering pleasure. "Yes. That's a good boy; let it all out in my butt." Thorax looked worn down and beat by his brother's huge asscheeks hammering onto his crotch.
"I-I c-can't... I'm gonna... g-gonna... aaaahhh-oohhh!!" Thorax then came into Pharynx's butthole as his ass clamped down and milked Thorax for every drop of his orgasm. He sprawled out onto his bed, helpless before his still horny brother. Pharynx then pressed his hands into both sides of his asscheeks and mashed them together to squish up against Throax's shaft, which was still buried into his rectum.
"W-What're you... d-doing?" Thorax was panting from the ministrations of Pharynx's giant buttcheeks squishing together onto his shaft like a sandwich.
"Making my little bro nice and rock-hard again." the soft and supple butt fat showed Thorax's cock no mercy whatsoever.
"N-No way... I-I can feel it getting stiff again. S-Stop that." Thorax tried but failed to stifle a moan; much to Pharynx's pleasure Thorax was too far deep into the influence of Pharynx's potent pheromones to resist any longer.
"Nope. I don't think I'm going to. How's about some more rough-housing with my rump?" It was so soft and heavy that Thorax could do nothing against it, especially in his current state.
"P-Please... no more bouncy butt."
"Well then, fancy going for a bounce then, Brother? I do." Pharynx said as he began to bounce up and down onto Thorax's shaft again.
"Oooh... man. That feels... I-Intense. S-Sweet m-momma metamorphosis, I-I can't stop him." Pharynx slowly lifted his butt, ensuring that the underside of Throax's shaft was grinding up against the insides of his rectum, making the changeling king whimper in unbearable pleasure.
"Big buggy butt goes squish ~♬" Pharynx said in a sing-song tone as his butt came sliding down upon his shaft again, making Throax's vision go white from the sheer pleasure and the weight of his ass slamming onto his crotch.
"I-I c-can't... f-fight it anymore... d-darn you, Pharynx." Thorax then began to hump into his brother's anus.
"That's right, little bro, you're no match for this bug and his massive ass." Pharynx then looked over his shoulder as he glared lustfully back at his brother, thrusting his hips uncontrollably and moaning against his will. "You're gonna blow another nice and thick load for me."
"P-Please... don't. I won't make it past this round; I'll faint for sure."
"Well, that's not my problem, Bro. You're just weak against my ass. There's no shame in admitting it." Pharynx snickered as he continued his bouncy assault onto his brother's shaft as it began to throb and twitch into his butt. "J-Just admit that you're a whore for my big fat butt, and you'll get to have all the fun you want with it."
"N-Never! The embarrassment... no way, Bro."
"Well then, I hope you are ready for some more bouncing. Cause this butt ain't stopping until you say you love it." Pharynx chuckled as he ground his tush all over Thorax's shaft, making him buck, twitch and whine in bliss. "Now I know you felt that one, Bro."
"I-I can't keep this fight going for much... longer." Thorax was forced to moan out in pure pleasure as Pharynx's brutal bouncing assaulted him.
"S-Such a good boy, you are. Just let it happen, Thorax. Trust me on this; it'll get much better once you do."
"O-Oh my... i-it's too much... I-I give up, Brother." Thorax then went into the full-thrusting swing as his hips pistoned into Pharynx's tightened rectum.
"See, was that so hard for you to do, Bro? Now I want you to beg me for it."
"W-What? B-Beg you for what?"
"For your orgasm. Beg me for it, or it'll never happen." Pharynx then tightened his rectum to where Thorax couldn't even thrust his hips anymore- he was caught in the painful bliss. "Uh oh. It looks like my little bro got stuck in my big booty trap."
"P-Please, Bro. T-This is so cruel, even f-for you." Thorax tried to hug his brother's immense buttcheeks, but it didn't help quell his horniness. Thorax was whimpering at the desire to cum- he needed to cum.
"I don't hear any begging down there." Pharynx giggled as he was holding back Thorax's inevitable orgasm. "Locked up tight like a reinforced safe, huh?"
"P-Please..."
"Go on... keep trying to beg."
"P-Please l-let me cum, Bro."
"Hmm... Nah. Not good enough. Here, let me help you out there. Who's the biggest whore for my big buggy butt?" The desire to cum was burning into his loins; this was too much for Thorax to handle anymore.
"I-I am."
"You're what?"
"I-I am a whore for your b-big buggy butt."
"Hmm..."
"P-please, Brother! I'm a whore, a slut, and bitch for your asscheeks. I want this; I need this. Please. I'm your bitch! I'll do anything; please l-let me cum."
"Hmm... okay. But only because you asked me so nicely." Pharynx went back to bouncing onto his shaft as Thorax aggressively pumped into his big brother's butt. "I'll make you into my little butt bitch, little bro."
"O-Oh my... oh, thank you, Bro. I need this so badly." Grabbing onto his big brother's asscheeks, Thorax thrust his hips into his ass until he felt the rush of his orgasm coming out. "I-I'm... c-cumming... ooohhhh!!" Thorax then shot his hot and thick cum rope into his brother's hungry and greedy butt.
"Hmm... pretty good load, little bro. Now it's time for you to go to sleep. All of this sex must have made you exhausted." Thorax sighed in bliss as his softening shaft slipped free from Pharynx's butt, and he collapsed onto his bed, fast asleep as his big brother lay next to him to snuggle him. "Good night, little bro."
