Step Sister
Madison was a spoiled rich girl, content in her big penthouse apartment, living with daddy - who was rarely home anyway. Then he remarried, and her two kids came to live with them. Madison was enraged, doing everything she could to make her disdain clear. When the older boy finally turns her across his knee both of them realize that the harsh spanking has had a different affect than intended. Thus begins Madison's slow descent into becoming their plaything and sex toy, as spanking and harsh bondage change her mind about her new step-siblings, and a lot more besides.

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            Madison was filled with confusion. She revelled in the hot, sweaty, carnal sex acts, relished the hard pounding of his cock inside her, and even got off on the way he just...just used her, fucked her hard and fast. But at the same time she was terribly embarrassed about it, at least afterwards, and couldn't meet his eyes, let alone talk to him. She still didn't like him, still thought he was a jerk and a creep, but her body gloried in the way he handled it and she couldn't find it in her to complain.
            She was totally flustered around him, angry, indignant, excited, aroused, embarrassed...all those things and more. She was used to being treated with a certain respect, even awe and reverence, but he treated her like dirt, calling her names and using her as he wished.
            She didn't know what she could do to change that, and didn't even know if she wanted to.
            The next night she was shocked awake to find him straddling her, sitting down on her belly. He pinned her arms to her sides with his knees and covered her mouth as she screamed. He grinned down at her when he saw she recognized him, but didn't remove his hand.
            In fact, he kept it there as he pulled what looked like a small black ball out of his pocket and pressed it against the back of his hand. He pulled his hand away quickly, only to shove the black ball thing down into her open mouth.
            Her yell died quickly as he jammed the thing into her mouth. It puffed her cheeks out and spread her lips wide, muffling any sound she might make as it crushed her tongue down. To her anger and alarm she saw it had a thin strap that he pulled behind her head and tied in place.
            She struggled to break free, but his weight held her easily, and his legs kept her arms pinned to her sides until he purposefully pulled one free. He held it firmly and shoved it up above her, putting her hand near the corner post. Then he pulled a leather strap out of his pocket and tied it around her wrist. He held her arm down flat on the bed as he tied the other end of the strap to the corner post, then he finally let her arm go.
            She could hardly move it, though, and pull as she might she couldn't break it loose. He laughed at her attempts, producing another strap and tying this one around her other wrist. He pulled that hand free then and pushed it up towards the other corner post, tying it there.
            He rolled off her then, and after a second's hesitation she tried to kick out at him, but it was useless. Her hands were tied up above her and she could get no leverage. She was angry and confused, but also felt a growing excitement and more than a little wary of what he intended to do to her.
            She kept pulling at the straps, trying to tear free, but she got nowhere. He grabbed one of her thrashing legs and pulled it down, wrapping another leather strap around her ankle. He tied it tightly, then pulled her leg open jerked hard on her ankle, hard enough to lift her off the bed briefly.
            Then he tied the other end of the strap to the bottom corner post. Before she could do anything to respond to this he had her other leg well apart and was wrapping another strap around that ankle. Again he pulled hard towards the other post, then tied the strap to it.
            The result was that she was bound spread-eagled to her bed, arms and legs wide, and so tightly bound to the corners that she could hardly move. She kept trying anyway, straining and pulling with all four limbs as though by sheer effort she could break loose.
            Tom didn't do anything but stand there and watch, his pajama pants bulging out like a tent. He licked his lips appreciatively as her body strained, watching the play of muscles across her smooth belly and narrow chest, watching her breasts shake and her back arch.
            "Nice," he said.
            She stopped moving except for her chest, which was heaving from exertion. She stared silently up at him, and in the blink of an eye her resistance vanished as she gave in to the sexual heat that had been growing within her since she'd first wakened to find him atop her.
            She stared at him with wide eyes, wary of what he would do but eagerly anticipating the heady, erotic moment when he would climb atop her again and this time rape her. Rape her! He would rape her! Her body trembled a little at the mere thought of him atop her. She pulled again at the bonds, not to escape but to reinforce to herself how helpless she was, how exposed and naked and tightly bound.
            She watched him as he watched her. Then he eased forward and sat on the edge of the bed. His eyes flicked over her lewdly displayed body, and his hand reached out and slid onto her stomach. He caressed her downy soft skin, his fingers touching lightly, sliding in slow circles.
            He moved his hand up over her rounded breast, squeezing a little, but mostly just stroking. His hand moved up the side of her neck and through her hair, then down again, across her face and between her breasts, down her chest and belly and in between her legs.
            He caressed her pussy, rubbing his hand up and down between her legs, dipping his fingers lightly inside the mouth of her sex and then running them down along the insides of her thighs.
            He stood up then, and turned away. He went to the door and left, closing it behind him.
            Madison stared at the door in surprise, wondering what was going on, wondering where he had gone, what he intended to do. Surely he didn't intend to leave her tied up like this all night. For what?
            But then the door opened again. For a moment she thought it might be her father or Kristine, but it was him that returned. He was carrying a brown paper bag in one hand. And behind him came Penny.
            Madison instinctively pulled at the bonds to free herself, or to cover herself up, but of course they held easily. She blushed red as Penny came into the room and stood beside the bed, gazing down at her without any expression on her face.
            Penny was wearing a blue robe, much like the brown one Tom wore. Tom locked the door behind him then came up beside his sister.
            "Looks good, huh?" he said to her. "Got a little friend for us to play with."
            He put down the bag then gripped Penny's arm and turned her towards him. His hands went to the belt around her waist and untied it, then opened the robe and shoved it back over her shoulders. She was naked underneath, but made no effort to hide herself as the robe dropped to the floor behind her.
            Madison's eyes went even wider as she saw the naked girl. Up close, standing right in front of her like this, Madison could see she was even bigger in the chest than she'd thought before. Her breasts were simply huge... big fat melons with giant brown nipples. Her waist was tiny beneath it and her hips slim.
            "Get to work on her tits," Tom said casually.
            Still without any expression, Penny climbed into the bed. Again Madison instinctively sought to pull back, and was unable to. Her mind went into overdrive as the buxom girl crawled in between her legs and settled her hands down on her breasts.
            She'd never really thought, except for while watching these two going at it last week, about having sex with a girl. Now it seemed she had no choice. She still found the idea disgusting, and would have pushed the fat titted girl away if she could.
            But Penny leaned forward and laid her hands over Madison's round breasts, then began to work her fingers into the soft flesh with calm certainty. Her nimble fingers kneaded and squeezed and massaged her breasts with the touch of one long familiar to the job.
            In contrast to Madison, Penny seemed to care not a bit about her nudity. In fact, she seemed almost bored as she worked her fingers into Madison's breasts with hard, nimble motions.
            Then she slid forward over her body, laying her own naked flesh down onto the helpless blonde girl. Her heavy breasts pillowed out beneath her and rolled over Madison's skin as she slid up her body. Then their breasts were mashing together as Penny lay full length atop her.
            Her hands stroked up and down Madison's body as her breasts rubbed in slow, circular motions over Madison's own breasts. The girl smiled for the first time, then leaned down and kissed her softly on the side of the face. She slid her fingers through Madison's blonde hair as her tongue slithered down the side of her cheek then up and down the nape of her neck.
            She kissed more passionately, her tongue slurping as she began to suck, then to gnaw lightly at the blonde teen's throat. Her hands returned to Madison's breasts, squeezing and rolling them against her own as she ground her body down.
            She slid lower and brought her lips close to Madison's left nipple. She stared at it for a moment from inches away, then pursed her lips and blew air over it. The air seemed both hot and cold as it set her nipple tingling, and Madison caught her breath anxiously.
            Penny's tongue came out and slid onto Madison's breast, trailing slowly around the edge of her areola. Her eyes moved upward and met Madison's, and she smiled slightly. Her tongue moved closer, until it was skimming past the edges of her nipple.
            Then she slid it over her nipple, closed her lips around it, and sucked it gently up into her mouth. She sucked harder and harder, drawing more of Madison's exquisitely sensitive breast meat into her mouth so her tongue could work it over. Her teeth chewed and gnawed at the blonde girl's flesh as she slurped and drooled and sucked on it for all she was worth.
            Madison stared at her in shock and uncertainty. Having another girl sucking on her nipple was a bizarre thing, but there was no denying that what she was doing was... was incredibly hot and arousing. Her nipple, her breast, had never felt so hot and tingly and sensitive.  At the same time both of Penny's hands were working deftly at her breasts, kneading the swollen hot flesh, pinching and rolling her nipples, mashing the fat round mounds first one way then the other.
            She shifted her mouth to Madison's other nipple and started working on that. Then Tom leaned over her and Madison had only seconds to witness the black scarf he held in his hands before it covered her eyes and was tied around her head.
            Now she was blind as well as dumb. Not only couldn't she protest, she couldn't even see what they were doing.
            She could feel, though, could feel Penny's lips and teeth and tongue on her nipple, her hands and fingers against her breasts, and Penny's own heavy breasts rolling and grinding against her lower chest and belly.
            A few seconds later she felt something against her ears, the familiar tightness of her stereo headphones as they pressed against the sides of her head. Music blared through them, symphony music, slow and heavy. Now she couldn't even hear the other two. It was like she was in a world of her own, where nothing existed but herself.
            Being blind and deaf seemed to focus more of her attention on her body, on what they were doing to it. She strained to identify the smallest touch against her naked, spread-eagled body, excited, but also fearful, at what they might do to her.
            She pulled instinctively at the bonds again, but with no real desire to break free. What was going on was beyond her fantasies, but unbearably sexual, and she could only lay there and experience it.
            Penny was still working over her breasts. Her breasts were so hot and swollen they ached, and right at the center were two burning coals that used to be her nipples. She just knew that if she could see them the two pink buds would be sticking straight up, hard enough to support all her weight if she were to roll on her stomach.
            She felt her juices flowing, felt her body throbbing with lust. Her pussy ached to be touched, to be squeezed and rubbed and stroked, to have a big cock pushing deep into it. Even without it, though, she was nearing orgasm. It was the strangest feeling. It was like the sex heat was coming more from her breasts than her pussy, like she would have an orgasm just from having them sucked and groped.
            Suddenly Penny's mouth abandoned her right nipple, then there was a sharp shock against it. She cried out in surprise and pain, but no one heard, not even her. She tried to identify what had caused the sharp pain, but couldn't.
            Penny's tongue was lapping and slurping over her nipple, and the little bud quickly forgot whatever the shock had been. But then her other nipple felt a jolt of jagged pain, and again she yelped, her body jerking in response. Again she couldn't identify it. The closest she could come was the pain she felt when she wore her heavy sweater and got a static electricity shock from touching something metal.
            But those shocks had been against her fingers, not her nipples.
            Again she yelped and her body jerked violently as her nipple was shocked, and again Penny's mouth engulfed it and sucked as her tongue whipped across the sore pink bud.
            Her clit sparkled with lust and she prayed Tom would stick his cock in her, or his fingers... anything, her dildo, a pencil. She needed to have something inside her so bad she would have begged them if she weren't gagged.
            She felt another shock at her left nipple, then her right. She cried out, and jerked in response. Penny licked and slurped on her raw, ultra-sensitive, swollen breasts, and she moaned in passionate delight. Her breasts were burning, like sacks filled with boiling water, and every time Penny squeezed them her mind was swamped by pleasure and heat.
            She felt Penny sliding downwards then, her fat breasts rubbing against her lower belly, then sliding down her naked sex. She felt her open pussy rubbed by...by...what had to be Penny's breast, one of them anyway. She groaned and rolled her hips upwards, amazed at the very notion that someone would rub their breast against her pussy.
            Penny's breast felt as soft and hot as her own pussy did, and she could feel the girl's fat, raspberry sized nipple stroking up and down right against her slit. It was an amazing sensation, especially when she rubbed the hard nipple right against her clit.
            She humped up, cursing against and biting at the gag in her mouth, straining at the straps holding her. She felt her guts twisting, her insides churning, as Penny continued to rub her soft breast meat across her clit.
            She grunted then as something heavy came down on her belly. It was Tom. It had to be. She felt his naked ass on her belly, and her excitement flared higher. She felt his balls against her soft skin, felt the long, thick length of his cock laying along her body.
            His knees pressed against her sides as he eased upwards. His hands gripped her overheated breasts  as he slid his big prick up between them. He mashed her breasts together, squeezing them down around his cock, then he began sliding the shaft back and forth in her cleavage.
            Penny was rubbing her own breast even harder against her clit, her fingers prying her pussy lips open to expose her clit to her hardened nipple.
            Madison cursed, then, with the realization that she couldn't make a sound even if she screamed at the top of her lungs, began to moan and groan and cry out in pleasure. For the first time in her life she didn't have to care if anyone heard, didn't have to worry about what she sounded like. She gave into the pleasure coursing through her body, wriggling and jerking and humping as the pleasure built up inside her.
            She had never felt pleasure like this before, never felt it so all-encompassing, enveloping her entire body from head to toes. She trembled and shook as her mind was flooded with hot, heady sexual delight. Her head thrashed and jerked helplessly as the fires built up to an unbearable level.
            She came, screaming mindlessly into the gag as her body was wracked by frenzied convulsions. Ecstasy seared her and drove the breath from her lungs. A great roaring sound blew through her skull as her mind shattered and flew apart.
            She blanked out, conscious, but unthinking, a raw mass of flaring nerve cells and burning flesh. Penny continued to rub her breast against her clit. Tom continued to mash her boiling breasts down against his thrusting cock, but though her body felt them, her mind was beyond identifying anything. It bounced and rolled in a flood of sensations, twisting and turning in dazed incomprehension.
            In the midst of her come Tom joined her, his cock flashing into overload, his balls exploding. He shot thick wads of sperm into her tight breast flesh and against her chin and throat, groaning in pleasure as he mashed her soft breasts against her pumping prick.
            He slowed his movements, then stopped, gasping for breath as he fell forward over her. He let his groin mash down on her breasts as he lay there regaining his breath. He felt the blonde teen's hot breath against his belly as he lay there, then rolled off and looked down at his sister still rubbing her breast against Madison's wet, pink opening.
            Penny stopped and sat back, her hands stroking up and down the insides of Madison's quivering thighs. She bent forward again, then trailed her tongue slowly up the inside of her thigh and along the side of her slit. She tongued around and around her pussy, while her finger slid gently up and down the tight little slit.
            She pushed both thumbs deep into the blonde's pussy hole and pulled the sides apart, straining Madison's pussy mouth to the limit as she made her hole gape. She stared down into the dark interior of the girl's tunnel, then placed her mouth against it and blew as hard as she could. She sucked then blew, then sucked. Her tongue whipped out and drove down into the tight sex tunnel, flickering like a snake as her nose rubbed against the blonde's clit.
            Tom picked up the shock tube and turned it on again. He pressed it right next to the blinded blonde's right nipple, then zapped it. As before she jerked helplessly, a soft cry escaping through the ball-gag. He shocked her other nipple then, smiling as she jerked and moaned.
            The shock tube was on a low setting, but before he was done with Madison he intended to have her screaming on high. That was for later, though, once she was broken in.
            For now he watched as his sister tongued and sucked the girl's pussy opening, patiently stroking his cock as he watched her fat breasts hang down below her breasts. He considered turning the shocker high and making those big melons dance, but decided not. Penny was already fully trained. He'd play with her once Madison was ready.
            Penny lapped repeatedly at Madison's clit bud as the blonde began to stain at the bonds and whine through the gag. She humped her sex up into Penny's face as her chest heaved and her head rolled from side to side.
            He pressed the shock tube against her clit and Penny hurriedly pulled her mouth back. A small spark of electricity shot into the quivering little fuck button and Madison cried out in pain as her body thrashed weakly.
            He nodded and Penny began sucking on the clit, her soft, full lips surrounding it as her tongue slithered back and forth against it.
            Tom pressed the narrow shock tube against the mouth of Madison's sex, then drove it up into her belly. He pumped it in and out slowly while Penny sucked heavily on the quivering girl's clit. He heard Madison's pants and groans escalate, heard the desperation even through the gag.
            Suddenly the blonde girl stiffened. Her head jerked violently back and she cried out in pleasure. Tom pressed the button on the bottom of the shock tube and sent a long, continuous blast of electricity into the center of the blonde's belly.
            Madison's cries of pleasure changed tone, and her body thrashed and shook and pulled madly at the straps holding her down. Penny sawed her fingers against her exposed clit bud, feeling the buzz of power through the blonde teen's belly.
            Within her own little world, isolated from everything but the sensations flowing through her body, Madison quietly went mad. Unable to see or hear or move, she was caught up in a roaring wildfire of pleasure and pain. They mixed together, the crackling electricity that was jolting her insides fused with the exploding sexual pleasure of her climax and sent it soaring upwards into an entirely new plane.
            The pleasure that boiled through Madison's body was excruciating. It tore along her nervous system, snapping off nerve endings and making muscles spasm and shake. It seared her body and mind and blasted her senseless.
            The ecstasy ripped through her body like a firestorm. Pandemonium reigned within her spastic body as she flopped and shook in animalistic pleasure, caught in a prolonged climax of impossible power. Her body trembled like a leaf in a high wind as muscles pulled and shook and jerked continuously.
            And then it slowly seeped away, leaving a shattered mind and blasted body behind. She lay there limp and utterly exhausted, only her heaving chest showing she still had life. Tom eased up on the button and drew the shock tube out of her soaking snatch, letting Penny lick and caress the bald, puffy pussy pad as the blonde recovered.
            They weren't finished, not nearly, and the blonde would come again and again before the night was through. In the morning she'd be further along the road he wanted her to travel, not near the end yet, but through the hardest part.

 

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