Step Sis “Maybe we could take a picture of me sucking your dick, it will make my boyfriend crazy”

Fiona’s heart raced as she sauntered into the living room, the silky fabric of her baby doll negligee caressing her bare skin with each step. Her petite frame looked even tinier next to her oversized stepbrother Rex, lounging on the couch in nothing but boxers. She couldn’t help but notice the growing bulge straining against the thin cotton.

“Rex honey, I was just thinking… These constant fights with your girlfriend Australia are so silly. You two are crazy about each other. Maybe if I helped out a little, you could win her back.”

Rex raised an eyebrow skeptically, his deep voice flavored with amusement. “Oh really Fi? And what exactly did you have in mind?” He flashed a crooked grin, dark eyes sparkling wickedly.

Fiona nibbled her plump lower lip, wide blue eyes innocent and demure. “Well, I was thinking… Maybe we could take some pictures of me sucking your cock. Something to drive Australia wild with jealousy.” She batted her lashes coyly. “Unless you’re worried you wouldn’t be able to handle me…”

Quick as a flash, Rex grabbed her wrist, pulling her down onto his lap with a triumphant growl. “Shut up Fiona,” He snarled, but there was a playful glint in his eyes. His large hand cupped her delicate face, tilting her head up to meet his heated gaze.

“Mmm, I love it when you get all stern with me,” Fiona purred, pressing against him. Her pert breasts strained against the satin, brick pink nipples pebbled and visible through the flimsy fabric. “Tell me Rex, big as you are, are you man enough to make me cum on your fat cock?”

The challenge put that predatory gleam in his eyes. Slowly, his big hands slid down her arms to squeeze the gentle swell of her hips. “Cocky little brat, you have no idea,” He rasped darkly, spinning her around and throwing her over his broad shoulder like a sack of potatoes. Fiona squealed with surprised delight, blonde pigtails swishing as he carried her down the hall to his room.

Rex tossed her onto his messy king bed, looming over her like a dark shadow. “Strip,” He commanded with a face that brooked no argument. Fiona giggled and arched her back, shimmying out of her negligee in record time. She laid naked and wanton on the rumpled sheets, thighs splayed open wantonly. She could feel how wet she was already, blonde curls glistening with need.

Rex drank in the sight, gaze roving hungrily over every inch of creamy skin. With a low growl, he went to his knees, grip tightening on her thighs. “Spread those legs Fi, show me that pretty pink cunt.”

Fiona gasped, a pretty pink flush spreading over her porcelain skin as she bared herself completely. “Like this big bro? Does my tight virgin pussy make you hard?”

He dragged his calloused thumb through her soaked slit, pressing against her entrance. “Fuck Fi, you’re drenched,” he growled, circling her clit, watching her squirm. “I bet you’ve been touching this needy little cunt when you think of me, haven’t you?”

Fiona’s head fell back with a desperate whimper, hips rolling into his touch. “Please Rex, fuck me,” she begged shamelessly, arching like a cat.

In one smooth motion, Rex ripped his boxers down, hard cock springing free. He stroked it once, twice, groan building in his throat at the sight of her.

“Gonna stuff this tight cunt so full, you’ll forget that pussy boyfriend even exists,” He rasped arrogantly, feeling her shiver in response. Without preamble, he notched the tip of his huge cock against her entrance.

“Fuck,” Fiona gasped as he stretched her open, slick walls fluttering around his girth. Rex circled his hips, working himself deeper with every roll of his hips. When he bottomed out, buried to the root, they both shuddered.

“Told you Fi, big dick man enough to make you scream,” Rex smirked, rolling Fiona easily beneath him. She looked positively tiny, drowning in his bulk.

“Bastard,” Fiona groaned, nails digging into his shoulders. Rex yanked her legs up around his waist, cock driving deep. Fiona screamed, back arching like a bowstring as Rex set a relentless pace.

Their hips slammed together, wet skin slapping filthily. The room filled with the sound of their harsh breaths and the creak of the bed, each furious thrust driving him deeper into her willing heat.

“Fuck,” Fiona screamed wildly, body shaking. “Fuck, fuck, so deep!” Her tight cunt milked his shaft like a velvet vise.

“Take it, fucking take it Fi!” Rex snarled, sweat dripping down his back with the effort. He pounded her into the mattress, hips pistoning. One hand grabbed her throat, squeeze ever so slightly. Fiona saw stars.

With a guttural shout, Rex buried himself to the hilt with a final surge of his hips. Fiona screamed as she came, back bowing as the thick pulse of his hot seed flooded her clutching walls. Rex groaned her name, hand tightening on her throat as he pumped wave after wave into her accepting heat.

They collapsed onto the bed in a tangle, panting heavily. After long moments, Rex rolled to the side, pulling Fiona tight against his chest.

“Fuck Fi,” He murmured against her hair. “That was incredible.”

“Uh-huh,” Fiona agreed, curling into his warmth. Her eyelids fluttered drowsily. “Think Australia will spell jelly with that dangerous brain of hers?”

Rex barked out a laugh at that.

“I’m sure those pictures will give her all sorts of ideas,” He chuckled, dark eyes glinting with wicked mischief. “And if not, maybe we’ll just have to give her a private show next time…”

Fiona smirked, trailing a finger down his chest. “Mmm, yes please. I’d love for her to see you split me open on this fat cock again.”

“That’s my girl,” Rex purred, rolling her under him again. “Now be a good slut and open wide for big bro… Hubby’s little prick won’t satisfy you anymore after this.”

“Mmmm, I love when you talk dirty,” Fiona purred, easing back down on his cock with a grateful moan.

And so the naughty half siblings sank back into each other’s warmth, bodies moving together in a six-nine bliss.

Just another afternoon in the incestuous wonderland of this debauched home…