"There's a couple of inches left," Paul said.
"Slam it in!" Robin said. "Go ahead, you do it!"
"You sure you want it?" Paul asked, feeling his prick swell with new energy.
"Yes! Do it! Fuck my ass!"
Paul held her hips with both hands, digging his fingers into the soft flesh. He withdrew his prick slightly and then lunged forward with all his might. "Take it!" he winced, feeling his prick dig wetly into the back of her skitter.
"Oh God!" Robin moaned with a raspy voice. "That's good! So big and good!"
Paul didn't know how she was doing it, but somehow she managed to take the full length of his prick. The base of his cock ground against her shitter rim with pulsating warmth.
"Fuck me!" Robin whispered, barely able to get her breath. "Christ, fuck the skit out of me!"
Needing no encouragement, Paul withdrew his cock until the end of his prick nestled just inside her tiny, tight opening. Then he jammed forward, thrusting fully into her asshole.
Robin felt a burning in her guts that seemed to grind inside both her skitter and her pussy. She reached under and touched her brother's dangling nuts. She pulled them forward, pressing them against her cum-stained pussy lips.
"Stick your cock all the way in and then stop," she said. "I want to put your balls in my pussy!"
Paul did as he was told, but barely maintained any control as Robin thrust his nuts inside her cunt. He grunted loudly, hardly able to believe that both his dick and his nuts were totally buried inside his sister.
"Oooohhh, I like this!" Robin groaned, feeling her brother's cock throb inside her skitter, and his nuts vibrate against her cunt lips. "Don't move! Don't ever move!"
"Sorry," Paul murmured, withdrawing, causing his nuts to flop out and slap against his thighs. "I've got to start fucking!"
Robin leaned on her elbows and let her brother do what he did best. He began ramming in and out of her shitter with increasing momentum, causing her to experience a new, thrilling sensation of pleasure. Her shitter burned with a throbbing hunger just as her virgin cunt had a short time ago. She knew it was impossible to have an orgasm in her asshole, but strangely enough, that's exactly where she felt the surging release tear into her tissues.
"Fuuuuuccckkk meeee!" she wailed, hungrily clamping her shitter muscles around his throbbing cock. "Oooohhhhh!"
Two separate and distinct spasms gripped her body in hot release. Her cunt began spasming along with the muscles in her skitter, bouncing and crushing together, gushing upward.
"Unh! Unh! Unh!" she grunted, spitting out the noises with each throbbing, violent release.
His sister's all-consuming orgasms inflamed Paul with his own burning, aching lust. He crammed his prick deeply into her tight, frothy skitter, knowing at any moment, he would spill out his guts, slam his load violently into her asshole. He wanted desperately to hold on. To make it last. To keep this feeling alive. Forever.
"Jesus Fucking Holy Goddam Christ Almighty!" he yelled, jamming the first hot wad of cum into her guts. The concept of forever now became very finite, measured in throbbing jerks. "Fuck! Fuck! Fuck! Fuck! Shitting Holy fuck!!!!"
The sensation Robin felt was as if someone had poked a string of barbed wire in her cunt, threaded it into her shitter, then yanked it out her asshole. The gushing wads of hot cream splattered into her body, soaking up every square inch of greasy warmth.
They yelled out together, their moans and grunts a duet of total release. For several long seconds, their bodies smacked and slapped together, and then after Paul thrust the last of his load into her shitter, they both fell in a heap.
"God, that did it for me!" Paul said, inhaling between each word.
"Not for me!" Robin said, pushing her brother on his back. "I'm not going to stop until your cock is dry as the desert!"
"You can't mean it!" Paul said with a grunt. He watched his sister crawl between his legs and gobble his cum-smeared prick into her mouth. "God, I guess you do!" he added.
Robin murmured a sigh of delicious hunger. His cock was a feast of flavors. His sperm, so rich and thick, the salty taste of her virgin blood, and the acrid aroma of her shitter, plus the unbelievable hardness of his smooth, long dick, made her pussy explode again with raw pleasure.
"Oh God!" she gurgled, sucking his cock with lunging bites. "Oh God, I want to eat you!"
Paul spread his legs a little more to give his sister room. He watched her take his prick into her lungs like she had done it all her life. The eagerness of her moves, and the delicious vision of her writhing body, filled him with new, pulsating energy. He touched the back of her head.
"I don't know what is best," he said, "your tight, little pussy, your asshole, or your mouth!"
"Let me do it to your asshole too," Robin said, pulling her lips away from his dick. "Let me suck out your shitter!"
He raised his right leg and turned slightly sideways to allow his sister to press her lips against his asshole. He winced with pleasure when he felt her probing, hot tongue jut into his shitter, a hungry lapping job of sucking warmth.
"Mmmmmmmmm," he groaned, feeling her tongue ram fully into his asshole canal. "Suck it, you ass-licking cunt!"
Robin stabbed her tongue in and out of his shitter with hungry thrusts, forcing spit inside the opening and then sucking it back into her mouth, savoring the heady, acrid flavor. Her hands were all over her brother's body, grabbing and clutching his balls, his cock, his thighs, smearing the juices of their bodies into his crotch hairs.
"Oh baby sister, suck me!" he moaned. "Suck me all over!"
Hungrily, Robin aimed her mouth upwards, licking and sucking the undersides of his nuts, grinding her nose against the base of his cock. She felt as if she could swallow her brother whole.
"God, I love this!" she moaned, gobbling his prick into her throat.
A guy can take only so much, and Robin had finally given it. Paul flipped her over on her back and rammed the full length of his prick into her throat.
"God, take it all in, you fucking cum-licking cunt!" he groaned, humping forward as he ground her head savagely into his crotch. "Suck out my cum and gargle it into your lungs!"
Quite frankly, Robin didn't know if what her brother was doing was as much pleasure as it was pain. His cockhead jammed against her tonsils, then poked into the back of her throat, cutting off her air. She flailed about, trying to inhale, but the power of her brother's lust was too much to fight. She relaxed the muscles of her throat, allowing him to pierce into her voice box. His nuts scraped against her bottom lip like sandpaper.
"You wanted a big fucking dick, you little cum-eating pussy, well, now you've fucking got one! Suck it! Christ, suck it hard!!!" Paul yelled.
A gushing smack of hot, creamy sperm dashed into her throat at that very moment, filtering into her lungs. She coughed and choked, mixing the fluid and a small gasp of air, causing her voice-box to rumble and boil with a gurgle.
"Uuummmphhhfftttth!" she spluttered, unable to drink down his full, thick load.
"All of it!" Paul winced. "Drink every fucking, every sucking drop!"
Thick, powerful streams of jism gushed into her throat with such brutal violence, Robin thought she would die. Almost drowning in his jerking, throbbing climax, she seemed like two separate bodies. One was experiencing a delicious glow of warmth as rippling spasms of release thundered into her cunt. The other was choking to death on an unending supply of cum. Gallons of hot, sticky, creamy, delicious, steamy cum.
The two bodies suddenly became one. The throbbing in her pussy thrust upward, smacking against the gulping of her throat. She was on fire, every nerve exploding in a hot bath of total, eternal release. It was several moments before even the slightest wave of reality touched her.