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Helping His Big Dickgirl Sister

Warning! This story includes: Incest, Dickgirls (with balls), and most shockingly urethral penetration, aka docking. It also includes some very unrealistic sizes and acts. If that's not your cup of tea, look elsewhere. All characters depicted are 18 years of age or older.

*****

"Ohhh, I'm about to cum, sis!" John frantically rubbed his eight-inch boner as he felt orgasm coming. It was crazy, whenever he thought of his hot, hot, 19-year-old sister, he felt his dick harden like it never did before. He imagined her huge delicious ass jiggling, as he cupped her full fat tits and tweaked her big thirsty nipples.

"I'm cumming!" he screamed to himself, as his dick spurted out several thick ropes of cum into his toilet.

John washed the cum off his sticky dick, and put it back in his pants. Reaching into his pocket, he felt for the pill he got from his friend the day before.

"You want to seduce your sister, right?" his friend had said. John reluctantly nodded. "Well, this will guarantee it, and it will add in an extra effect I am sure you won't mind."

John seemed reluctant then, but now, he was more excited to do it than anything. He left the bathroom and ran downstairs to where his sister would be.

Their parents had went out that night, and it was just him and Eleanor. Perfect for his plans.

Running into the living room, he found his sister sitting on the couch, watching TV absent-mindedly. She was wearing tight black pants, and had a similarly dark tank top that so beautifully showcased her fat big tits. He couldn't help but feel his cock tug, looking at her body.

"Heyy Johnny, why the rush?" she asked him, smiling ever so innocently.

"You're the best sister ever, and because we're alone today, I've decided to make us some lemon juice to enjoy!" he said, a cheerful smile hiding his dark intentions.

"Woah, well, okay! Tell me if you need help with anything," she said, somewhat flattered with his attention. Thankfully, she didn't think much of it.

John ran back to the kitchen, and quickly started making the juice. Very soon, he had two cups of the stuff ready. He eyed the taller glass and decided to dedicate it to Eleanor for the day. And to get that going, he dropped the pill into the glass, and it quickly melted in, mixing with the content instantly. He chuckled to himself and took the glass to his sister.

"Thank you bro! You're the best too!" his sister said, taking the glass her brother gave her, without thinking too much about the fact that he only gave her one and not the other. She gulped it down with visible thirst.

John, seemingly even more thirsty, watched the liquid pour into her mouth with thirst, eyes wide at her as her tongue stretched out to lick some bits of lemon juice near her lips.

"Is something wrong?" she asked him, somewhat concerned that he's starring.

"Oh, no, no, I, it's" he started, stuttering, but his lame attempt at excuse was not needed as she quickly became distracted with a sharp feeling in her crotch.

She dropped her glass on the couch, as she felt that feeling turn into pain. Her tits visibly grew, spilling out of the tank top, and John could feel her visibly rising as her ass grew in size as well. But most importantly, a bulge formed in her pants that quickly grew. She screamed as the bulge grew painfully, taking on the form of a large dick that quickly tore through her pants and stood straight up, aggressively hard.

John could feel himself drooling as he kept staring at her fat dick continue to grow in size and thickness. It looked absolutely delicious, and his comparably smaller dick fully hardened as a response.

"I... feel so hot..." His sister proclaimed, a hunger growing in her eyes, as she tore off the rest of her pants and tried to take off her tank top but tore it as well in her frantic state.

"Help me brother... I don't know why I have this now but it's so hard and I don't know what to do with it!"

"You want my help? But that's incest!" John feigned modesty, while he secretly lusted for her cock more than anything.

"I don't care! Just please help me feel good!" she said, the hunger in her eyes growing as she saw his boner.

"Alright, sister, I'll go ahead and fuck you if that'll help!" he rose up, pulling down his pants.

"Fuck me? But... my pussy is gone and I only have a dick now..." she started. But her brother had much better ideas. Much much better.

Her brother lined his dick up, and thrusted it deep inside his sister's urethra, feeling intense pleasure instantly.

She moaned, somehow even his intrusion into her most sensitive orifice feeling more pleasurable than anything.

"Ohh... Harder brother!" she said, as she looked hungrily at the bulge her brother's respectable dick made inside her own monstrous erection. Rewarded, said bulge began to move as her brother began very fast harsh stabs, leaving her urethra then thrusting back in to the hilt in a full force.

The mix of pain and pleasure made her feel much better than she ever did before, as she began to rub and finger her nipples. She could feel a finger sink inside her nipple, and somehow that was even hotter than regular masturbation.

Her brother, meanwhile, was in heaven, as he thrusted quickly and roughly into his sister's huge cock. It massaged his cock so deliciously tight. Getting to see the sizable bulge he made was a plus.

"Ohhh... fuck my filthy dirty cock harder, brother! It lusts for your thick dick deep inside it..." she said, biting her lip now as she stuffed another finger in her nipple.

Witnessing his sister bite her lips like that sent John over the edge, as he began to abruptly cum.

"Oh yes! Cum inside my filthy balls, please! Ohh.." she yelled like a bitch in heat, as he roughly shoved his tongue inside her mouth for a wet French kiss as his balls continued to unload inside her dick.

Rope after rope traveled from brother to sister, quickly creating more mass in her already giant ballsack. Her balls grew from cantaloupe sizes to watermelon sizes, as her brother's orgasm finally cooled down. Shrinking, his dick limply detached from her dick.

"That was amazing..." he said, in bliss from his orgasm.

His sister, however, hardly felt sated as her cock remained ever so rock hard.

"What? You're done?!" she said, but her brother's shrinking cock provided a better answer.

He stuttered, not very conscious. She felt her hunger linger still, and she didn't know what to do about it...

In a desperate move, she threw her legs in the air, and adjusted herself to be on her back. She took a deep breath, and thrusted her huge cock into her lips, taking in the tip.

John awakened from his post-orgasmic haze to see the marvelous sight of his sister's monstrous cock reaching between her huge tit mounds and into her mouth. That sight alone revived his cock, and he could feel all the arousal coming back to him.

However, instead of fucking her, he had slightly different plans.

He roughly grabbed her head with one hand and pushed it in even deeper into her dick. He continued to try to bend his sister, making her dick disappear deeper and deeper into her own throat. He could feel her getting blue due to the lack of air, but he didn't allow her to escape her own vice grip.

In the meantime, he began to massage her heavy, cumfilled balls, squeezing them roughly with his other hand. He reached his head towards her tit flesh, and sank his tongue inside her nipple, licking her wonderful milky insides. The milk had an aphrodisiac quality to it, and he began sucking hungrily on her nipple while her tongue sank inside, French kissing her nipple in a sense.

All the stimulation and lack of air were beginning to show their work on his sister, and she could feel her orgasm rising. However, he had one last plan, as he thrusted his dick into her asshole, plugging it as she began cumming inside her own self.

Her huge balls deflated slightly as thick ropes of cum visibly made their way inside her heavy thick cock, pumping through into her hungry throat. A delicious bulge began growing in her belly, quickly growing into a bulge rivaling pregnancy. Simultaneously, her tits began spewing similarly delicious fluid into his mouth and onto herself, coating everything in a thick layer of milk.

Eventually, she couldn't hold her breath anymore, and her dick slipped out, quickly shooting ropes of cum into the air, covering both brother and sister.

Impressed with the scene, her brother came inside her ass, somewhat pathetically in comparison.

"Wow." He spoke as she slowly came down from her orgasmic haze. "That was amazing."

She nodded, as her vision returned to view the remaining bits of the cum flooded room.

"We should do this again," he said, blissfully.

"Brother... I think the again will have to be now..." she said, worryingly looking at her cock grow even larger and harder than it was a moment ago. "I'm feeling very hot again."

His tired erection throbbed painfully again at the sight, as his sister began licking herself to taste the remaining bits of delicious cum all around her, already ready for another round.
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