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Missy Cooper crept down the hall, trying not to make a sound on the hardwood floors. She was still in her pink sleep shirt and panties, her dark hair tangled from sleep. The digital clock on the wall read 2:47am. Unable to sleep, she had been lying in bed for hours, her mind racing. As she neared her older brother Sheldon's room, she heard strange noises coming from inside.
Curiosity piqued, Missy pressed her ear against the door. There was grunting, heavy breathing, and some sort of rhythmic motion. What the hell was he doing in there? She had to know. Slipping inside, Missy quietly closed the door behind her.
In the dim light, she saw a shocking sight. Sheldon was sprawled on his bed, head thrown back, one hand pumping furiously between his legs. His other hand gripped a wrinkled comic book. Oh god, she realized with a jolt, he was jerking off! At 16, he was far too old to still be a virgin.
Missy felt a strange flutter in her belly. She'd snuck peeks at his porn mags before. Seeing him like this, lost in pleasure, made her panties suddenly damp. I should leave, she thought. But she couldn't tear her eyes away, riveted by his long, pale fingers gliding over his reddening cock. She bit her lip. He looked so desperate, like he needed release.
Unbidden, her feet carried her closer. Sheldon was too focused on his task to notice her. His breath came faster, thighs trembling. He was close, Missy realized. So close to cumming. A wicked urge seized her and before she could second guess, she climbed onto the bed.
"Sheldon," she whispered, putting a hand on his heaving chest. He startled, eyes flying open. "Missy! What the fu-"
But he got no further. She wrapped her fingers around his throbbing dick and began stroking in time with his frantic rhythm. A strangled noise escaped him. "Don't stop," he gasped. "Don't you dare fucking stop!"
Emboldened, Missy pumped harder, drinking in the sight of his pleasure. His cock was hot and hard, the head shiny with pre-cum. She rubbed her thumb over the slick crown. Sheldon shuddered, abs tensing. With a guttural groan, he exploded, spunking all over her fist and his Star Wars sheets.
"Fuck, Missy," he panted. "Holy shit." His cock gave a last feeble twitch as the final drops of cum oozed out. Sheldon gazed up at her, eyes glassy. "You...you just..."
"I helped you," she said simply, letting go of his softening dick. "No big deal."
Missy stood up, wiping her sticky hand on her shirt. Then a wicked smile curved her lips. "You know, I helped you get off. It's only fair you return the favor."
Before he could respond, she shimmied out of her panties and threw a leg over his face. Sheldon's eyes nearly bugged out of his head. "You want-"
"Yeah, lick it," Missy ordered, lowering her dripping pussy to his startled mouth. "Eat me out like you're starving for it. I wanna cum all over your face and you're gonna make me."
Her brother was never one to disobey direct instructions. Sheldon dove in, his clever tongue delving between her slick folds. "Mmm!" The vibrations of his groan against her clit made Missy gasp. "Oh fuck yes..."
She ground herself on his face, smearing her juices over his mouth and cheeks. Sheldon lapped it up greedily, holding her hips in place. His nose nudged her clit as he tongue-fucked her deep. Electricity zapped up Missy's spine. "Right there," she panted, "don't stop!"
Sheldon complied, alternating between flicks over her sensitive nub and thrusts inside her clenching hole. Missy's thighs began to quake. She was close, so close. "Make me cum, Shelly," she whined, "make me fucking cum on your face!"
With a lewd slurp, he sealed his mouth over her clit and suckled hard. Missy shrieked, her pussy clamping down. The world exploded in a supernova of ecstasy. She gushed into his mouth, cumming harder than she ever had, seeing stars.
Spasms wracked her as she rode his face through the intense orgasm. Viselike, her cunt gripped him as she squirted, soaking Sheldon's chin and chest. He made a surprised noise but didn't stop licking, prolonging her bliss.
Finally, Missy pushed off, collapsing beside him. "Holy shit," she breathed. "That was..." Words failed her. She'd never felt anything so intense.
Sheldon licked his lips, savoring her taste. "I don't know about you," he said, "but that was the best stars I've seen in my life."
Despite herself, Missy giggled. "How many girls have you done that with?"
"Well, now one, I guess," he replied. A pink flush stained his cheeks. "Not that I don't know theory. You liked it though?"
"Oh, I liked it," she assured. "You're a natural." An impish grin spread across her face. "Now, since you got to taste, it's my turn..."
She wrapped a hand around his cock, delighted to feel it already hardening again. Sheldon inhaled sharply. "You don't have to..."
"I want to," Missy purred, shifting to straddle his waist. "I'm going to ride you 'til we both see those stars." She rubbed the swollen head through her soaked folds. "No more waiting. I need you inside me."
"Okay," Sheldon squeaked. "I mean, yes! Definitely yes."
With a roll of her hips, Missy sank down, impaling herself on her brother's thick cock. "Oh fuck," they moaned in unison as he stretched her open. She began to move, undulating sensually.
Sheldon's hands flew to her hips, gripping hard enough to bruise. "Missy," he choked out, "you're so tight...and wet. How are you this wet?"
"Because of you," she gasped, grinding down. "This is so good." Her inner muscles fluttered around him. "I'm not gonna last..."
"Me neither," he said through clenched teeth. "You feel too perfect."
They moved in tandem, the slap of skin on skin obscenely loud. The room reeked of sex. Missy chased her high, determined to climax on her brother's cock. "Harder," she demanded. "Fuck me harder!"
Sheldon complied, hips pistoning up viciously. He pounded into her, cock battering her cervix. "Touch yourself," he grunted. "I wanna feel you cum on me."
Missy slid a hand between them, frigging her clit. She was close, teetering on the edge. A few more thrusts. A few-" Sheldon bit her neck and she shattered with a scream, pussy milking him viciously.
"C-coming!" he warned, before stiffening, spurting deep. He flooded her channel, pumping what felt like gallons of jizz into her fluttering cunt. "Missy!"
She collapsed against his chest, both of them sweaty and spent. As they caught their breath, Missy nuzzled his neck with a satisfied hum. "That was fun," she declared. "We should do it again sometime."
Sheldon just laughed weakly, holding her tight. He had a feeling this was only the beginning for them. But right now, he was content to hold his little sister as they drifted off to sleep, connected intimately.