Please

At least he was able to study.

Sort of. Shining had spent the next few hours after they’d gotten back from the library sitting at his desk and staring at an open textbook. At first, he’d celebrated finally having some time to himself, but the productivity of his session turned out to be...disappointing. Truth be told, as much as he’d glued his eyes to the page, scarcely a word of information passed through his skull. He was too distracted, too horny, too pent-up to do anything more.

His cock now refused to slip back entirely into its sheath; instead, it sat at a permanent half-mast, dribbling a thin stream of precum down its shaft. Once every few minutes, Shining was forced to grab a tissue and clean himself off. He wasn’t hard enough to masturbate, but he was more than horny enough that he wished he could.

It was torture. His balls sat in his lap, plump and heavy. Their warmth radiated into his thighs, causing his muscles to tense and contract instinctively. Shining’s thoughts were so disordered that he scarcely noticed when his half-hard member throbbed, splattering a fat glob of precum onto the pages of his textbook. He only noticed it when he tried to turn back a page and noticed that the paper was stuck together. His nostrils twitched with the musk of his own scent. Tears beading at his eyes, Shining just gritted his teeth, glaring at the page in the textbook before surprising himself by just ripping it out.

It bounced into the waste basket, a crown atop a small mountain of used tissues. For all his efforts, Shining’s lap was getting increasingly sticky, the drool from his unanswered libido matting his fur more and more every second.

He didn’t even notice when it had, but at some point during the evening, Shining’s hoof had slipped down between his legs to rest gently on his thigh. As he scanned across a paragraph on pegasus anatomy, his eyes firmly glazed over, Shining’s hoof twitched toward his crotch.

He jumped, the gentle brush of his hoof against his stallionhood sending a jolt of electricity through his body. Shining winced, his fat, swollen orbs throbbing with fullness. His hoof, unable to help itself, pushed a bit more firmly against them. He watched in awe as his massive nuts, each one nearly twice the size as they’d been just days ago, squished gently beneath his touch.

He swallowed, a hard lump in his throat. Trembling, he continued to caress his nutsack lightly. At this size, there was no way anypony could fail to notice his arousal. He certainly couldn’t.

He gave his balls another squeeze. Shining’s back arched, his teeth biting down hard to prevent the yelp that would have otherwise escaped. His limp cock throbbed reflexively. He could actually feel the seed churning in his fat nuts, could feel how full they were. Oh, how he longed to empty them. To spill that seed, to cum all over his room—or perhaps, he thought, in somepony else. He was thinking of Cadance, he knew, but somewhere inside of him, he knew he was longing for Twilight.

Before he knew it, Shining’s whole lap and stomach were covered in his warm, drooling pre. With a start, Shining reached for a tissue and did his best to dab it all up. It took some doing, but he finally managed to get most of the matting out.

Somewhat shakily, he pushed away from his desk and got to his hooves. He needed to take his mind off of things. Needed to clear his head. Maybe he’d get something to drink downstairs. Yeah. That was a good idea.

It was only when he was coming out of the kitchen, a cool glass of water floating beside him, that he heard her.

“Shiny! Will you read me a bedtime story?”

Shining froze. Slowly, barely daring to move any other muscle, he turned and looked down.

Twilight was beaming up at him. A pile of books was floating at her side. Suddenly feeling very self-conscious, Shining took a step back away from her. When he felt his half-hard erection—no longer so soft at the sight of his sister, damn it—slap against his thigh, he physically flinched.

“Sorry, Twily,” he said, grinning awkwardly. “I’ve still got to study.”

“But you’ve been studying all day.”

“Not true,” he pointed out. “I did take you to the library.”

“Yeah!” Twilight brightened. “And got some great books. I want to read one of them with you!” The pile floated a bit higher toward Shining’s muzzle; with a flicker of his own magic, he telekinetically nudged them back down.

“Look, Twi,” Shining said. “I’m just too busy right now.”

“Oh, come on, Shining.” Dad’s voice rang out in the hall. Shining glanced up and saw his father smirking at him from the foot of the stairs. “Mom usually handles this kind of thing, but she won’t be back till late. Besides, it’s a school night—you shouldn’t be up too late anyway.”

“So?” Shining asked, somewhat lamely.

Dad’s eyebrows knitted together. “So,” he said, “I just think it’d be nice if you did something for your sister. I know she’d love to spend some quality bonding time with you.”

“Oh, yes,” Twilight said. “Oh, please.”

Shining winced again at the mention of “bonding.” Deep within his gut, a beast reared its terrible head at the word, images invading his mind of just what kind of sibling “bonding” it had in mind—and what he, he was growing to fear, would enjoy just about more than anything else.

There she is, the beast whispered into his ear. Look at her plump little flank. Her wide smile. She’d do anything for her big brother. Even help him cum…

Shining shook his head, his ears slapping against the sides of his skull. “I don’t…” he began. But one look at his dad’s unamused look stopped him in his tracks. Shining gulped. “I mean, sure. You got it.”

“Hooray!” Twilight leapt for joy. She nuzzled against his leg—sending him stiffening once again—and prodded his side with a book. “I’ve already got one picked out.”

“Okay,” Shining mumbled. He felt more shell-shocked than anything else. Out of the corner of his eye, he saw Dad give an approving nod before trotting up the stairs. “Where do you want to do this?”

Do what? the beast purred. Shining shoved it back out of his mind.

“The living room’s fine,” Twilight said. Her cute little tail was swishing eagerly behind her. “On the couch?”

“Sure.” Shining’s lips were moving without his control, but that was okay because he didn’t feel in control anyway. He felt like a prisoner in his own body, locked into a set of desires and confusions that he barely understood. Walking as stiffly as a ponnequin, he trotted over to the couch and plopped down onto the far-left cushion.

Too late, he realized that he still had a half a stiffy poking up between his legs. Too late, he realized that his balls, ripe and full, were big enough to actually push his legs apart. Too late, he realized that his cock, far from settling down, was drooling more precum than ever in its effort to get his attention.

Almost too late, he saw Twilight galloping up to the couch—and toward him, specifically. Almost too late, he saw her leap into the air—with his lap as her clear destination.

Only the pillow beside him saved him. With a crack of magic faster than a whip, Shining yanked the pillow out from under his arm and pulled it in front of him. Twilight plopped right onto his lap—and then the pillow slid smoothly between their torsos, pinning his engorged shaft to his belly and pushing her forward just enough so that she wasn’t directly over his nutsack.

Shining’s heart was beating as fast as though he’d just run a marathon, but the look on Twilight’s face told him that he wasn’t about to get any respite anytime soon.

“I thought we’d read this one,” Twilight said, matter-of-factly. She levitated one of the books—one of the thinner ones, surprisingly—up into Shining’s field of vision. He eyed it suspiciously, grateful for the distraction from the pressure over his organ.

“The Pink Rose?” he asked. “Twi, I didn’t know you liked...uh, romance novels?”

Twilight turned up her nose. “I’m allowed to sample other genres,” she said, sniffing. “Mom said I should.”

Shining chuckled, a bit awkwardly. “Sure, kiddo,” he mumbled.

He made to open to the first page, but Twilight stopped him. “We were on Chapter Seven,” she informed him. “The top of page sixty-nine.”

Shining’s libidinous mind didn’t miss the potential innuendo there. His nostrils flaring slightly, he flipped to the correct page, snuggled back against the couch pillows, and settled in to read.

“Chapter Seven,” he read aloud. “In the Garden.”

As he read, Twilight snuggled up against his chest—or at least tried to. She wound up snuggling against the pillow instead, and for that, Shining was grateful. At first, he was grateful for the book, too; maybe this would be the thing to finally take his mind off of his buildup. As he read on, though, it became clear that this book was anything but helpful.

“‘Oh, Midnight’,” Shining read. “‘Take me now, and I will be yours forever.’” Who wrote this stuff? “‘I shall, Eclipse,’ her suitor replied. His hoof curled around her barrel, pulling her a few inches closer. She turned to face him, her lips slightly parted—”

Shining cut off there. His cheeks flushing brightly, he glanced down at Twilight. “Are you sure it’s okay for you to be reading this kind of stuff? You’re awfully, uh, young for it.” Not to mention it’s way beneath your usual standards, he added silently.

“Yeah? Well, Mom said it was okay,” Twilight said. She chewed on her lip. “Can we just finish reading, please?”

Shining sighed, then picked back up where he’d left off. Unfortunately, as he read on, his thoughts drifted once more, his lips going on autopilot as his mind wandered elsewhere.

Oh, Celestia, but Twilight was sitting on his lap. He could feel her delicate filly legs resting atop his. The softness of her fur as it brushed against his own was doing nothing to help his growing arousal; her sweet, innocent scent filled his lungs with every breath. Soon, his erection was fully hard, and throbbing with a deep, primal need.

Shining shifted his flanks on the couch cushions—and nearly moaned as his member rubbed against the pillow’s surface. His erection had been drooling constantly for the past—five? ten?—minutes, and the rough fabric was now slick and hot with his lust. His motion set Twilight moving too, cuddling closer against the pillow to get comfortable again. As her fur slid across his, he felt his cock throb powerfully. It almost felt like she was grinding against the bulge in the pillow’s body, her tiny body playing with him, squeezing him, pressing his length against his pre-matted stomach.

He paused at the end of the next paragraph. He had to actually bite down on his lip to prevent a whimper from escaping. His cock was steadily drooling pre down his belly, and his balls felt fuller than ever. To top it all off, Twilight was still on top of him. Twilight was—

Shining swallowed, and started up reading again. The pillow had slipped up a bit sometime over the last page, leaving a full five inches of his torso exposed. Whether Twilight had pushed back against it, or the throbs of his own shaft had pushed it up, he didn’t know. Whatever the reason, Twilight had scooted back with it—and the back of her flank was now pressed tenderly against his front.

Her flank. Her flank. Her rear was pushed lightly against the front of his bulging shaft; in girth, he was easily a third as wide as her entire rump. Shining had to stifle another moan as Twilight shifted her flanks against him. Her tight little cheeks seemed to embrace his base, wrapping around it. As she slid against his girth, he nearly moaned. His shaft was so slick with pre that he’d matted Twilight’s rear with it, letting her tight filly rump all but glide across his lap.

With a start, Shining realized that he could feel...something else against his thigh. Twilight had shifted positions again. Now, both her legs were straddling his thigh, her head resting in her forehooves as her front elbows leaned on his lap. He could feel her rubbing against his leg—her, her most intimate parts, that small ripple of skin gliding gently against his coat. Oh, Celestia, but it was driving him mad.

He couldn’t keep himself from imagining it. What would they look like? Those small, soft filly lips. Barely parting—for why would they? They’d never been pushed past, never been used. He could be her first.

The image flickered into his thoughts. Twilight was presenting to him, teasing him. He imagined her lifting her supple rear into the air, letting her winking marehood stare back up at him. He imagined her wiggling her cute little rump, egging him on, asking why her “big brother, best friend forever” was being so slow, so hesitant when all she wanted was for him to feel good. Oh, how he wanted to feel good.

His muzzle trembled. Unbidden, more images came to his mind. He pictured himself mounting her, pinning the tiny filly beneath his weight as his comparatively massive shaft prodded against her rear. Then again, that voice whispered, she was already in the perfect position.

How easy it would be, that beast in his gut whispered, to jiggle her up a few inches. To slip his fat cock through the gap beneath the pillow. To feel her cheeks wrapping around him, teasing him further as his hefty orbs released more and more precum, basting her rear with his lust. To tease against her, to slip inside her, stretching her virginal walls tight around his member. To feel her bouncing up and down atop his lap as he fucked her, her big brother, on a night and at a time when nopony would be watching.

To feel that pressure building again, to actually go over that edge again, to cum inside her tight filly’s womb, to finally find release in his sister’s flower as the juices of her life’s first orgasm streamed down his thick, veined shaft—

“We’re going to have to finish there,” Shining blurted out suddenly. The magic around his hoof flickered out and died; the book flopped to the floor. He lifted a hoof to his forehead and felt it burning. He wiped away a hooffull of sweat; in fact, his whole body felt sweaty. As his hoof came away, he saw it shaking. Trembling with strain—or perhaps, with fear.

“But—”

He cut Twilight off. He didn’t have the time for this. He couldn’t let this go any further. He pushed her off—he meant to nudge her, really, but it came off as more of a shove—and winced when she let out a yelp. At least she landed on her hooves.

“Sorry,” he said quickly. He jumped off of the couch as quickly as he could, holding the pillow over his crotch until the last possible second. The sudden loss of Twilight’s fillyhood teasing his thigh didn’t help his situation at all—if anything, it only drove his libido madder with lost, with lust, for a need for what it couldn’t possibly have. “Really. We’ll, uh, finish some other time.”

There was an odd look in Twilight’s eyes. Still, her cheeks were red and puffy. “But you said you’d finish reading it with me!” she wailed, pouting.

“Sorry, Twily,” Shining said. He felt his cock throb again beneath him, and realized that he’d been steadily drooling onto the carpet. A puddle full of several tablespoons of his pre had pooled beneath him; his balls felt fuller and plumper than ever. They hung between his legs, the size of oranges by now, only barely hidden by his tail and surely visible to Twilight’s ground-level view. “Really. Some other night.”

With Twilight watching after him, crestfallen, Shining all but galloped away. He let the stairs groan beneath him, heard the floorboards creak as his hooves thundered across the second floor. Only when he reached his room did he relax, the door slamming shut behind him as he collapsed onto his bed.

His chest heaving, Shining stared helplessly up at the blank white of his bedroom ceiling. Above him, seeming to dominate his vision, his erection stood tall. A river of milky-white ran down its side, his thick, black cock still throbbing in time with his heartbeat. It seemed to tower above him, a monolith, a tower, a raging beast beating with every pump of new blood through his veins.

Panting, whimpering, his forehead still slick with sweat, Shining felt his eyes slowly flutter shut. It was going to be a long night.