Brotherly Love

by The Abyss

Rating: mature
Tags: Sex, Rumble, My Little Pony: Friendship is Magic, Thunderlane, Romance, Porn, Fetish
Length: 4774

Months after starting a lustful and cum-filled secret relationship with his big brother, Rumble still can't get enough of Thunderlane's cock. Everything goes smoothly until their parents interrupt one of their lovemaking sessions. (Rumble is aged up)

Months after starting a lustful and cum-filled secret relationship with his big brother, Rumble still can't get enough of Thunderlane's cock. Everything goes smoothly until their parents interrupt one of their lovemaking sessions.

Contains Aged-up Rumble, M/M, Incest, Blowjobs, and Butt Plugs.

Published 2017-12-13 18:30:07 UTC
Last updated 2017-12-13 18:30:07 UTC

Chapter 1

“Hey dude, that was a pretty good workout...” Rumble huffed as he shouldered open the front door to their house. It had been several months since he had moved out of his parents’ house and into his brother’s, and even though he’d wanted his own place, all the houses in Ponyville were too expensive for him and his measly paycheck. Thankfully, Thunderlane had offered to let him stay at his place for, provided that he help pay the monthly rent and the utilities, and he had taken him up on his offer without a second thought. “Right?” he asked as sweat dripped down his brow.

“Yeah, sure was.” Thunderlane dropped his gym bag next to the door and kicked it shut. He flew over onto the couch and flopped down upon it with a sigh of content. Rolling over onto his back, he made sure to give his brother a good view of his crotch as he spread his hind legs wide, smirking at him all the while.

Rumble rolled his eyes with a grin as he flitted onto the hammock they had strung up high in the corner. “So... got your eyes on any cuties lately?’ he asked.

“Yeah, I’m looking at one right now,” Thunderlane shot back.

Rumble chuckled as he let his eyes drift down to his brother’s bulging, skin-tight shorts. Thunderlane loved to wear shorts such as those to show off his rather large package, especially while they were at the gym. He’d been gifted by the gods with an unusually thick cock, one that Rumble had seen a lot of since he’d moved in. He’d stayed up many nights pondering his sexuality, for when he had first moved in with him, he’d been leaning more towards mares, but whenever he saw his brother’s dick flopping around, something stirred within his gut that made his heart throb.

And now, his heart wasn’t the only thing that throbbed.

Above all else, though, he loved the fact that it was all his. They’d been together in secret for the last four months, and living alone together had pushed them into a relationship, one he felt that the rest of society looked down upon. On that fateful night, they’d both had a few drinks too many and had ended up fucking each other’s brains out until they passed out. When they had woken up the next morning, covered in the other’s dried cum, Thunderlane was the first to admit that he really enjoyed last night, and even though the alcohol might have made him a bit more confident, he had said that he was open to blowing off some steam with him every once in a while.

But Rumble had wanted more.

Thunderlane stretched, letting loose a content yawn as he laid his head on a pillow. “I mean, there’s a couple of mares I’d like to ask out, and maybe this one dude, but I’m not sure if it’s the right time,” Thunderlane teased, propping his hind legs up on the arm of the couch. “I know that there’s never going to be a ‘right’ time to ask someone out, but I just got this feeling like I shouldn’t ask right now. Thank Celestia I have a special cutie living in my house, though, right?”

Rumble’s ears perked up at that as he blushed. He’s bisexual? Huh, you learn something new every day... he thought, cocking his head to the side. His tail swished back and forth as he felt the tip of his cock poke out from his sheath. The thought of Thunderlane jerking off into his mouth, helped along by a mare licking his shaft, made his mouth water as he imagined his brother pumping his hot load right into his stomach. He licked his lips, a slightly salty taste gracing his tongue. With his eyes going wide, he thought it was dried cum from earlier that morning, but a moment later, he realized that it was nothing more than sweat on his upper lip. He chuckled as he shook his head.

“So what do you wanna do tonight? I can make us some potato soup just like how Mom used to make it back when we were foals,” Thunderlane said. He dry-humped the air, making Rumble’s blush deepen. “And then maybe we can have a little fun in my bed afterwards. Sound like a plan?”

I don’t think I can wait that long... Rumble thought with a quiet whimper. The mere thought of Thunderlane’s cock sliding deep into his rear end, the touch of his balls against his as he bottomed out with each and every thrust, combined with the sounds of him panting over his shaking body made Rumble’s cock harden, pushing out of his tight gym shorts and springing free. It pressed against the bottom of the hammock, forming a noticeable outline on the thin fabric. He squirmed, trying to make it less noticeable, but Thunderlane chuckled a few short moments later.

“Kinda hard to believe that you’re already worked up just from me asking if you wanna fuck later.” Thunderlane rolled over onto his side and smirked up at him. “Although, you were kinda staring at my butt the entire time we were at the gym!”

“Y-You noticed?” Rumble stammered out, his ears flicking back as he pointedly avoided his brother’s gaze.

“Dude, I could feel your eyes on my ass the entire time!” Thunderlane flicked his tail once and pulled the front of his shorts down, exposing his sheath. “You want an appetizer before dinner? I’ve been a little pent-up today and it’s been a while since you last had something to drink... Besides, it’s just as good as a protein shake!”

No, it’s better. Rumble’s mouth started salivating at the thought of blowing his brother. His cock hardened even more as his eyes went wide, and he nearly fell from the hammock as he scrambled back down to the floor.

“Woah, easy there, fella!” Thunderlane said with a chuckle, rubbing his length with a hoof. “I’m not going anywhere, and you don’t have to share with anypony. It’s all yours...”

Wanting nothing more than to be a sweet little cockwarmer, he wrapped his lips around his tip and softly suckled it, coaxing out his brother’s precum that his heart so yearned for. As it graced the tip of his tongue, he felt his cock throb in his shorts, begging to be touched, to be played with, but he was a good cockwarmer. He knew that playing with himself could wait, for he knew that he would be rewarded with a stomach full of cum if he was able to satisfy his brother.

Rumble pushed himself forward and swallowed, his brother’s cock slipping down into his throat. His eyes drifted shut as he hummed in content, his snout pressing up against Thunderlane’s balls. Minutes passed as he bobbed his head up and down, wishing that it could last forever. Feeling Thunderlane’s tip flare up deep within his throat, he pushed down the ever-growing need to breathe and closed his eyes, wanting nothing more than to bottom out on his shaft and to feel his brother’s balls twitching against his snout as they pumped their virile seed right into his stomach.

Without warning, their front door opened up, their parents’ voices echoing from down the hall. Crap! he thought, Thunderlane’s dick popping from his mouth. A small whimper slipped past his lips as his ears flicked back. A little bit of precum dribbled down his chin.

“Anybody home?” their father asked, sticking his head just inside their house.

“Uh... yeah? Geez, didn’t anypony teach you to knock first?” Thunderlane asked, shoving his dick back in his shorts. “What are you guys doing over here, anyways?” He rolled over onto his belly to hide his erection and looked over the back of the couch, seeing his parents close the door behind them.

“For our monthly dinner with the kids!” their mother piped up. “Or did you guys happen to forget?”

“Heh, guess we did! We just got back from the gym, so we still need to wash up. Speaking of which...” He glanced at Rumble, his eyes going wide as he spotted a trail of his precum on Rumble’s chin. He wiped it away with a quick feather before their parents could see, then asked him, “You want to go first, or you want me to?”

“Why don’t you two just share a shower? Isn’t that what you jocks do anyways?” their father asked.

Rumble’s cock throbbed against his belly, and even though his parents couldn’t see it from his position next to the couch, he still bolted upstairs to the bathroom. He prayed to whatever gods were out there that his mom and dad didn’t see his erection, for he simply could not bear explaining why he had one while sitting so close to his brother. His muscles were still sore, and his cock throbbed against his lower belly. He needed to relieve himself, and quick, for his balls were simply begging to be emptied.

“Don’t use all the hot water, okay?” Thunderlane called out after him. “You know I hate taking cold showers!”

“I’ll try, but no promises!” Rumble yelled back. He trotted inside the bathroom, closed the door, and sat down with his back pressed against it. After ripping off his shorts, he wrapped his left hoof around his cock and furiously stroked it. As his cock grew to full-mast again, he stopped, panting softly as his mind teased him with a naughty fantasy, one that involved Thunderlane standing over him with a smirk. In his mind’s eye, Rumble leaned forward and lovingly nuzzled his brother’s cock before taking it into his mouth, the taste of his precum still fresh on his tongue. He couldn’t help but groan as his hoof quickened, a little bit of his own pre-cum dripping from his tip and onto his hoof, letting it glide up and down his shaft in faster bursts.

Feeling an orgasm well up inside his core, he stood up, hobbled over to the shower, then stepped inside. While he kept jerking himself off, keeping him on edge, he used his right wing to turn the shower handle to the left. As hot water began to cascade down his shoulders, he quickened his pace, panting softly as his balls twitched. With a low groan, his cum splattered against the wall in front of him.

As his orgasm faded away, he stood back up on trembling legs. Feeling a little of his cum dribble down his inner right thigh, he used a hoof to wipe it off. Wanting to get back under the stream of hot water, he took a step forward and stepped on a bar of soap, making him slip on his rear end with a loud, dull thud. He didn’t even feel his aching butt, for the sheer pleasure of his afterglow still soared through him, dulling his mind from everything else.

Rumble’s eyes drifted shut as his cock shrunk back into his sheath. “Heh, gotta make sure that I clean up before Thunderlane comes up for his shower,” Rumble muttered to himself as he pushed himself back up. Hearing somepony knock on the door, his head whipped up.

“Yo, Rumble, you okay in here?” Thunderlane asked, pushing the door open with a hoof. His eyebrows furrowed as he smelled the distinct scent of cum. He noticed his brother’s seed dribbling down the smooth white wall, and the fact that Rumble was blushing madly made him smirk. “Come on, why you gotta waste a good load like that? You know I’m always down to help you get off!” He stepped forward and used the tips of his wings to slowly pull his shorts off, feeling his brother’s eyes locked on his package. “Besides, I could use a shower myself, and you’re wasting all the hot water!”

“Heh, sorry...” Rumble said as he moved over for him.

“No worries, it’s just good that I came up instead of Mom when I heard that thud.” Thunderlane stepped under the stream of water and sighed. He hiked his tail up as he felt his little brother push apart his hind legs, and as he felt Rumble’s breath on his sheath, he smirked. “Couldn’t wait, could ya, slut?”

“Nope!” Rumble chirped as he settled down on his back. He pushed himself up with his wings into the perfect cock-sucking height, laid a gentle kiss on Thunderlane’s sheath, then teased its opening with his tongue until he felt his cock slip into his mouth. Wanting to please his brother, he moved down to his balls, sucked one into his mouth, then ran his tongue all over it. He couldn’t help but grin as he felt his brother’s cock twitch as it hardened over his right shoulder.

Thunderlane’s thick, heady scent overwhelmed his nostrils. Gone were the fruity scents of their soap and shampoo that Thunderlane was using, for Rumble’s mind could only focus on his brother’s thick, tantalizing cock. Unable to wait any longer, he scooted back and wrapped his lips around his brother’s tip, his own cock already starting to slip out of his sheath again.

“Geez, you really are a slut, aren’t you?” Thunderlane asked, bucking his hips forward. His little brother had such a wonderful tongue, and while it was smaller than most, he sure made up for his lack of size with his expertise, especially since he had gotten a lot of practice in recent months. Rumble’s tongue slipped down to the bottom of his head, right where it was most sensitive, and as his cock brushed against the opening to his throat, he had to fight his urge to push deeper. Since he had no straight shot into his throat, he held himself back, knowing all too well that he’d feel his brother’s lips on the base of his cock again as soon as they finished showering. “You wanna finish cleaning up so we can take this to the bed?” he asked, peering down between his legs.

Rumble’s shoulders drooped ever so slightly, then he pulled off of his brother’s cock with a wet- sounding ‘plop’. “But what about Mom and Dad?” he asked. “You think we have time?”

“Totally! You got me so close downstairs that I was gonna blow my load down into your stomach, but of course Mom and Dad had to ruin the moment...” His eyes lit up with glee as a sly grin slowly formed on his face. “Hey... wanna do something naughty?”

“What did you have in mind?”

“Let’s finish showering and I’ll tell you, but I will say it involves my cock in your sweet, tight little ass.”

He stood up and took Thunderlane’s place under the showerhead and finished showering in record time, especially since his brother incessantly nuzzled and licked his balls all the while.

The promise of a good butt-fucking was all the incentive he needed.

After they dried themselves off, Thunderlane led the way to their bedroom once he made sure the coast was clear. Once they had started their secret relationship, Thunderlane had suggested that Rumble should just join him in his bed since they spent most nights in it. There just wasn’t any point for Rumble to have his own room anymore, so they had turned it into a bro cave, complete with a large supply of booze and comfy couches, the perfect place for a casual slow blow or two.

As soon as Thunderlane neared the bed, a heavy weight fell on Rumble’s back, pinning him to the bed. “Heh, getting frisky already, huh?”

“Oh yeah. With Mom and Dad here, we gotta make this quick, though. I was thinking a butt full of my cum would be a kinky way to keep us pent-up throughout dinner, because Celestia knows I got a lot of steam to blow off.”

Rumble smirked as he felt Thunderlane’s tip brush up against his hole. His tail hiked up out of instinct, his nostrils flaring as he felt himself blush. “Wanna grab the lube first?” he asked, wiggling his butt back and forth.

“That might be a good idea... Now you can have a butt full of cum and lube!” Thunderlane laughed as he fumbled around the sheets, looking for the bottle they’d used just last night. “Where is that darned thing?” he muttered.

“We used it all up, remember?” Rumble pushed himself up, his throbbing cock bouncing against his stomach.

“Crap, that’s right... We have any more laying around?”

“I dunno...” Rumble trotted up to their nightstand and ripped open the top drawer. “Oh hey, there’s a little left in this bottle!”

Thunderlane’s eyes lit up. “Really? Awesome!” He flopped down on the bed, propping himself up on their pillows. “So whatcha waiting for?” he asked, wiggling his hips as his cock stood straight up in the air.

“Just admiring the view.” Rumble jumped on the bed and squirted a copious amount of lube on the tip of his brother’s cock, then lovingly nuzzled the lube all around, making sure that no part of his cock was left dry.

“Geez, you might have to take another shower after this... Mom and Dad might think that you got cum on your cheeks!” Thunderlane said with a cheeky grin.

“Oh? And whose scent will be on me after we’re done? They’re gonna smell you all over me!” Rumble stood over him, feeling Thunderlane’s forelegs rest on his upper hind legs. Thunderlane gently pushed him down, guiding him down onto his cock. Flicking his tail up and out of the way, Rumble grinned as he felt his brother’s cock finally come to rest against his hole. “Think we need to stretch things out before, um... you know.”

“Well, we’ve been fucking for almost every night this week, so you should still be pretty stretched out. Remember how easy it was last night? Just lemme know if it’s too much.” A wide smirk grew on his face. “You think you’d be able to hide a butt plug with your tail at dinner? Don’t want my cum slipping out of your stretched hole, after all.”

“Not a bad idea... What size should we use?”

“Well, the small and the medium sizes aren’t nearly as thick as my cock, so... definitely the large one. So come on, now, we can’t keep Mom and Dad waiting!”

“Yeah, okay... But first, lemme get into a better position. I don’t want to slip and have you impale me on your cock. My legs are still sore from those sprints you had us do around the track.” Rumble blushed as he lay down on his brother’s chest, tucking his head underneath his chin. “Remember how that happened when we got really drunk a month or so ago?”

“Oh yeah. How can I forget?” Thunderlane wrapped his wings around Rumble’s shoulders. “You ready?” he asked, lining up his cock with his brother’s butt.

“Mhm.” Rumble closed his eyes and pushed his hips back, feeling his the tips of his tail tickle the small of his back. Thunderlane’s thick, flared tip stretched his tight hole, the consistent pressure making it slowly open. Feeling the bumps on the edge of his tip, Rumble knew he was moments away from feeling nothing but pure pleasure, so after a deep breath, he nodded, silently telling Thunderlane to push further. He gasped sharply as it finally slipped inside. Feeling a bit of relief, Rumble nuzzled Thunderlane as he panted.

“All good, little bro?” Thunderlane asked, rubbing the back of his neck with a hoof. He worked his hips up and down, gently fucking him. He pulled back until the tip of his cock felt like it was about to slip out, then pushed back inside a few inches, letting him get used to his size again. It usually took him a few minutes before they could start rutting like wild animals, but when he felt Rumble sway his hips from side to side, he knew that he was ready.

Rumble felt his lover’s cock glide deeper inside of him, helped along by the slick lube. He clamped down hard, wearing down his ring as he kept it tight as long as he could. When he couldn’t hold it anymore, he relaxed, then slid back, feeling his cock slide between their bellies. Thunderlane’s medial ring pressed up against his hole, making him take pause. His cock had grown thicker and thicker up to that point, and he knew that if he could overcome that obstacle, he’d be able to feel complete. He took a couple of deep breaths, pushed himself up with his forelegs, then rammed himself the rest of the way down. His balls slapped against the ultra-soft fur of his brother’s lower belly, his hind legs quivering as he felt his lover’s cock twitch inside of him.

“Dang, bro...” Thunderlane murmured, fighting to keep himself from blowing his load. He wrapped a hoof around his little brother’s cock and stroked it agonizingly slow, smirking as it twitched in his grasp. “You good?”

“Y-Yeah,” Rumble stammered out. “Could we, um... do it how I like?” he asked, blushing furiously as he shifted his weight back onto his forelegs.

“Anything for you... slut.” Thunderlane pushed himself up, using a wing to push Rumble down onto his side. His medial ring popped out of his hole, so he wrapped a hoof around his brother’s hips to keep him from sliding the rest of the way out. Now standing over him, he draped himself over Rumble’s back and bit down on his ear. “So who’s a good little slut?” he whispered into his ear. “Only sluts like to get rutted senseless doggy-style...”

“M-Me...” Rumble murmured. “I’m a good slut.” He glanced over his shoulder, staring deep into his brother’s eyes as his ears flicked back. “I’m your slut...”

“You definitely are.” Thunderlane wrapped his hooves around his brother, holding him close as he felt his inner walls clamp down around his cock. He bucked his hips back and forth, the lube and the tightness pushing him ever closer to a blissful release. “You like getting fucked so hard you cum all over the place? And to think I don’t even have to touch you...” he said, nibbling on the tip of his ear.

“Y-Yes!” Rumble groaned, moving into a better rutting position. Thunderlane’s warmth made him melt in his grasp, his muscles going limp as his cock twitched between his legs. Unable to move, he wholeheartedly accepted his fate as his big brother’s cocksleeve. “Oh... there we go...” he whispered to himself as Thunderlane pistoned in and out of him. Every time his balls slapped against his, he felt complete, like this was his lot in life. Feeling stuffed so full made his heart flutter with love and adoration for his brother, for the sensation of his wide flare fucking him over and over again was something he would die for; he simply couldn’t live without it. Thoughts of his brother fixing a bridle to his muzzle teased his mind, making his hole tighten. He fantasized about being nothing more than used for breeding, to be pumped full of the life-giving essence that his mind, body, and soul so dearly longed for.

Rumble bore down as hard as he could, hearing his brother’s pants increase in volume. He pistoned in and out of his butt, pulling back until his flared tip was about to slip out, then rammed all the way back inside, never taking a moment to catch his breath. The sensation of his medial ring spreading his tight entrance made his vision grow blurry. This was the moment that he enjoyed the most, the time when Thunderlane used him to get off. That thought sent tingles down his back, making his cock grow as hard as it could possibly get. He closed his eyes, panting softly as he felt Thunderlane’s grip tighten around his barrel. His wings fluttered against his brother’s belly, straining against his grasp.

Thunderlane pushed himself up, standing on his hind legs as he grabbed Rumble’s flank with his front hooves. “You gonna squirt for me?” he asked, knowing that this position would no doubt hit Rumble’s special spot.

“Gah...” Rumble moaned, unable to form a coherent sentence. His tongue lolled out of his mouth as his wings unfurled. Each glorious thrust pushed him forward, little by little, until his head pressed up against their pillows. He latched onto one and buried his face into it, praying that it would muffle his cries of ecstasy. If it wasn’t for his brother holding his ass up, his hind legs surely would have given way.

As he felt his mind turn to nothing but fuzz, his balls grew closer to his body. After another few seconds of pure animalistic rutting, he groaned as pleasure exploded from his core. Cum dribbled from the tip of his flared cock, and with one final thrust from his brother, an all-encompassing warmth filled his rear. Thunderlane collapsed upon his back again, making both of them fall on their sides. His brother wrapped his forelegs and his wings around him, holding onto him for dear life as he pumped load after hot load of cum inside of him. Rumble grabbed onto Thunderlane’s hooves and bucked back against him, milking him for everything he had.

A couple minutes passed in silence, save for their pants. As he felt his wits slowly come back to him, Rumble nuzzled his brother’s chin, humming softly in content as he listened to him trying to catch his breath. “Gods above... I feel so bloated,” Rumble whispered, squeezing down on his brother’s cock. His ears flicked back as he felt it start to soften within him, but with an insistent buck of his hips, he was rewarded by a few more thrusts, spreading his big brother’s seed all over his insides. A little bit of it dribbled out of his hole and soaked into the fur on his butt, marking him with his brother’s tantalizing scent.

His heart yearned for Thunderlane to parade him around town, leading him along by a set of reins, letting everypony know that he was Thunderlane’s lover just by scent alone.

He let out a soft gasp as Thunderlane’s cock slipped from his hole. Rumble stood up on shaky legs, keeping his ass pushed up in the air so he could keep his brother’s cum from slipping out. He clenched down as hard as he could, but he couldn't keep his hole closed. “You wanna grab that butt plug for me?” he breathlessly asked.

“Yeah, sure, one sec...” Thunderlane wiped the sweat from his brow and slid towards the other end of the bed. He fumbled around in the nightstand’s drawer until he finally found Rumble’s favorite toy. With a sly grin, he licked it until it was soaked with his saliva, wiped it against his cum-smeared cock for good measure, then pressed it up against his little brother’s hole, twisting it from side to side as he watched it easily accept it with unwavering attention. “You know, it’s always hot to see this,” he said, working it deeper and deeper. “We should get a mirror in here the next time we fuck so I can watch my cock piston in and out of you, and you could watch, too!” With one final push, the toy slid the rest of the way inside, sealing his cum inside. An exaggerated cough from behind made him freeze on the spot. As time slowed down, his head whipped over his shoulder, his eyes showing him his worst fear.

Their parents stood in their open doorway, their jaws agape, much like Rumble’s worn-out hole had been moments ago.

“So, uh... we were wondering why you two were taking so long, so we came up when we heard some weird sounds,” their mother said as she rubbed the back of her neck. “So, uh... I think we’re gonna get going.” Her eyes drifted down to Thunderlane’s half-erect and cum-smeared cock, then licked her lips. “Your father and I have some... things to take care of back home.”

“Okay,” Thunderlane squeaked out, feeling his mouth turn dry. “So, uh... how long were you guys standing there?” he asked.

“Long enough. So... we’ll talk about this later, okay? See ya!” Their mother grabbed her husband and pushed him down the hall.

Thunderlane didn’t move until he heard their front door open and shut. He looked back at Rumble, shot him a sly grin, then asked, “Good workout, eh?”