Cloppy bits and pieces

It wasn't often that Princess Twilight invited her brother alone to her castle in Ponyville. But here he was, following her along corridors and up staircases to the master bedroom. He gathered from her demeanour that this meeting was likely to concern some sort of... intimate matter. The winks and lip bites she'd been throwing him were something of a hint.

Actually, thinking about it, he hoped it did. Her loose, elegant robes did little to hide the curve of her incredibly wide and fertile hips that framed an equally spectacular ass that wobbled and jiggled with every step - and standing directly behind her, he had a rather good view. Her recent ascension to alicornhood had transformed her from a cute but quite nondescript bookworm into a towering voluptuous goddess that rivalled the Princesses of the sun and moon, a head taller than her big, buff brother that once towered above her.

They reached the large door of the bedroom, Twilight producing a little silver key. She fumbled with it momentarily, and unconvincingly dropped it on the floor. She turned to Shining, her watermelon-sized tits stuffed very tightly into her dress proving incredibly hard not to sneak a glance at.

"I'm so clumsy, aren't I?"

She turned back, bent over and pushed her hips back, slamming her fat ass against Shining's crotch, drawing a suppressed grunt from his lips as she reached down for the key. She slowly straightened back up, her big butt still firmly pressed against her brother's groin, as she twisted the key in the lock. The door swung open and she stepped through it, Shining sighing in relief as the pressure against his awakening dick was released, only to be replaced by the tightness of a burgeoning erection in his underwear.

"Why don't you have a seat?"

Twilight was patting the bed next to where she was sitting.

"Thanks."

The soft mattress sunk beneath his weight as he sat down, and Twilight nestled in close, resting a hand on his thigh.

"Great to see you again, Shiny. Been way too long, hasn't it? So nice to have you all to myself."

A bead of sweat rolled down Shining's brow. He suddenly felt very warm.

"You too! Uh, Twily. You're looking... good. Really good."

Twilight followed his gaze down to her huge jugs, acres of mulberry cleavage on full display. She noticed the growing bulge at his crotch too and smirked.

"Thank you, Shining. Though I can't help feeling a little guilty. I've left my 'big' brother behind, haven't I?"

Her fingers slid a little further across his lap, mere centimetres away from his bulge.

"Wh-what do you mean?"

Twilight squeezed her brother's bulging bicep; he looked simply delectable filling out that white button-up shirt.

"I'm sure you've noticed the little growth spurt I've gone through. It's made things different between us. I loved having a big brother, and I know how I can have one again. Not that you're little now, of course - but a big mare has big needs."

Shining gulped. Twilight's hand was now resting *on* his bulge, and gripping it ever so lightly.

"Oh? What did you have in mind?"

She squeezed a little harder, her brother squirming under her handhold.

"I'm an alicorn now, Shiny. I thought my magical abilities were pretty impressive before, but now? I've got so much magic I don't know what do with it all. Well, I had an idea. And that's why we're here. Together. Alone."

Her horn glowed, and Shining felt a tickle along his spine.

"I can make you bigger, Shining. So much bigger. Enormous. The biggest, strongest, most well-endowed stud in Equestria. A limitless libido, enough muscle to lift this castle on your shoulders, plenty of energy and enough desire to keep up with little ol' me."

Shining Armour's heart felt like it was trying to burst out of his chest.

"Whaddya say?"

He looked into her eyes and nodded like a filly being offered candy.

"Great!"

Her horn gleamed with an intense light, and Shining felt a great surge within himself. He could feel something coming on. For a good ten seconds, the room was bathed in ethereal light as the alicorn poured untold amounts of magical power into his being. The light began to diminish, then receded completely. Twilight kissed him on the cheek.

"Enjoy, stud."

Shining looked down at himself. He felt a little dizzy. It was a pleasant dizziness, though. His shirt sleeves felt irritatingly tight. He gave his arms a flex and they tore open, glimpses of his white coat showing through. His legs ripped great holes through his dress pants as they piled on muscle, growing thick and corded.

Inside his underwear, things were decidedly cramped. His cock grew fatter and longer, stretching the white fabric as it elongated and widened. His balls, too, couldn't help but billow outward to greater and greater sizes. Shining felt like he was cumming perpetually as his junk grew and grew, the front of his boxer shorts being stretched out of recognition by a pumpkin-sized bulge - and still he grew.

"Oh, Celestiaauughhh--"

He groaned deep in his throat. His underwear finally snapped. A cock as big as his arm unfolded and flopped out in front of him, draping over his gurgling basketball-sized testes, before its insurmountable hardness managed to lift its great weight upward. He watched in slack-jawed wonder as it reared up like a stallion and slapped against his broad chest, sputtering pre against his neck. With a rumble and a creak, it sprouted upward, the head swinging lazily above him. He wrapped both burly arms around it and pulled it in - he never thought he'd ever have a cock big enough to hug like a pony, but here he was, locked in an embrace with his own member. He paused as his balls gave a loud burble, then cried out as they practically doubled in size in the blink of an eye.

It was time for the rest of his body to catch up to his oversized goods. His entire body began to expand in all directions - his pecs jutting out even further than they already had been, his abs even more exquisitely cut, his back broadening, his firm butt ballooning out into twin spheres of rock-hard muscle. He allowed himself to fall back onto the enormous bed he was sat on, and slowly grew across it. It was king size, but by now seemed more like a single to him.

Twilight practically threw herself onto the bed beneath him, grabbing his balls with both hands and ploughing her face into them. Shining could only writhe in ecstasy as she gave his nuts her full care and attention. By now, his legs were dangling off the end of the bed. His frame was packed with muscle and his cock was almost as tall as Twilight, standing straight up and not far from the ceiling. Twilight was thoroughly enjoying herself, face deep into his big, round balls, inhaling lungfuls of his irresistible musk. Shining had both hands on the base of his cock and was pumping hard.

"Mmm, you gonna cum for me, big guy? Don't worry, you're not gonna empty these things any time soon."

She dove back into those alabaster beanbags, encouraging her brother to spill his seed. How could Shining refuse? His toes curled and his cock bucked, he was right on the edge. It just took a big squeeze to his ballsack to send him over.

"Cuh-uhngh - aah!"

Twilight felt and heard a rumble in his balls. His flare opened wide to make way for the onslaught of jizz that climbed his monolithic member in a flash, and the first rope crashed against the ceiling, spraying them both. Another fat rope, then another, each splattering powerfully above them and drenching them in cum. Shining moaned uncontrollably as ecstasy ran through his veins, his enormous muscles flexing with each orgasmic pulse. Twilight had taken to massaging the base of her brother's tree trunk of a cock, coaxing out as much of his thick, hot spunk as she could.

The cavalcade of spurts went on and on, Shining's supply of spooge seemingly truly infinite. His sister wanted a sex machine, and by the stars she'd made him into one. By sheer force of will, he pulled himself down from the knife-edge of absolute bliss of cumming with an eight-foot cock, and the geyser of jizz started to diminish. Twilight was impressed, he could have gone on for hours with the amount of sexual energy she'd dumped into him but he'd reigned himself in pretty quickly.

Cum was everywhere. The two of them and the bed were blanketed in white, the ceiling was plastered and dripping with his essence, the floor around the bed was saturated, and his cock was still rock hard.

"That was a good warm-up, Shiny. Wanna get started?"