Brian had always known his sister Tiffany was attractive, but he never let the thought linger. They were close in the way siblings who had survived the same chaotic childhood often were—protective, teasing, occasionally vicious when the mood struck. At twenty-four, Brian still lived in the same house their parents had left them after the accident. Tiffany, twenty-two, had moved back in six months earlier after her last relationship imploded. She had the kind of body that stopped conversations: long dark hair, full hips, and a pair of 38DD breasts that strained every top she owned. Brian tried not to notice. Most days he succeeded.
That changed the afternoon the package arrived.
Tiffany had ordered something online under the vague heading of “stress relief.” The box was plain, no branding, just her name and their address. Brian carried it in from the porch and left it on the kitchen table. When she came home from her shift at the coffee shop she tore it open without ceremony. Inside was a sleek, curved sex toy—bright pink, dual motors, app-controlled, with a thick thrusting base and a clitoral stimulator that looked like a pair of lips. Alongside it sat a smaller bullet vibrator and a bottle of thick, warming lube.
Tiffany laughed when she saw Brian’s face. “Don’t look so scandalized. It’s just a toy.”
“You ordered that?”
“I did. And you’re not allowed to judge.” She held the larger toy up, turning it in the light. “Want to help me charge it?”
He should have left the room. Instead he stayed while she plugged it in, the soft blue light blinking as the battery filled. Something about the casual way she handled it—testing the buttons, listening to the quiet hum—made the air between them thicker.
That night the house was quiet. Brian was in the living room scrolling through his phone when he heard the first muffled moan from upstairs. Then another, louder. The toy’s motor was not as quiet as the packaging claimed. He tried to ignore it. Failed. The sounds grew wetter, more desperate. Tiffany was not holding back. When she finally came, the cry was sharp enough to carry through the floorboards.
Brian went to bed hard and furious with himself.
The next morning Tiffany sauntered into the kitchen wearing only an oversized T-shirt that barely covered the tops of her thighs. Her hair was messy. She looked thoroughly fucked out and pleased about it.
“Morning,” she said, pouring coffee. “Sleep okay?”
“Fine.”
She leaned against the counter, the shirt riding higher. “You heard me, didn’t you?”
Brian’s jaw tightened. “Hard not to.”
Tiffany’s smile turned wicked. “Good. I wanted you to.” She set the mug down and walked closer until she was standing between his knees where he sat at the table. “I’ve been thinking about something. Something we shouldn’t.”
“Tiffany—”
“First time incest,” she whispered, tasting the words like they were candy. “Doesn’t that sound dirty? Brother and sister. We’ve already crossed every other line in this house. Why not that one?”
He should have pushed her away. Instead his hands settled on her bare thighs under the shirt. She was soft, warm, and completely bare underneath. His thumbs brushed the crease where thigh met hip. Tiffany shivered.
“You’re serious.”
“Dead serious.” She climbed into his lap, straddling him, the shirt tented over her 38DD breasts. “I used the toy last night imagining it was you. It wasn’t enough.”
Brian’s cock strained against his sweatpants. Tiffany ground down against it, slow and deliberate. The friction was electric. She kissed him—open-mouthed, hungry, the first real kiss they had ever shared that wasn’t a peck on the cheek. It was messy. Tongues sliding, teeth catching. She tasted like coffee and something sweeter.
They didn’t make it to a bed the first time.
Brian stood, lifting her with him, and carried her to the couch. He yanked the shirt over her head. Her breasts spilled free—heavy, soft, nipples already tight. He buried his face between them, sucking one nipple into his mouth while his hand worked the other. Tiffany moaned and arched, fingers in his hair.
“Suck harder,” she ordered. “Bite a little.”
He did. She hissed and ground against his thigh. Brian shoved his sweatpants down just enough to free his cock. Tiffany reached between them, wrapped her fingers around him, and guided the head to her entrance. She was already slick from whatever she had done the night before, or maybe from pure anticipation. She sank down in one slow, continuous motion until he was buried to the hilt.
Both of them froze.
The stretch was intense. Tiffany’s mouth fell open. Brian’s hands clamped on her hips hard enough to bruise. For a long moment neither moved. The reality of it—brother inside sister, first time, no condom, nothing between them—settled like a live wire.
Then Tiffany started to ride.
She moved with the confidence of someone who had been fantasizing about this for longer than she would admit. Up and down, rolling her hips so the head of his cock dragged against her front wall. Brian thrust up to meet her. The wet sounds of their fucking filled the living room. Tiffany’s 38DD breasts bounced with every impact. Brian leaned up and caught one nipple between his teeth again, sucking hard while she rode him faster.
She came first, clamping down around him in rhythmic pulses, crying out his name. Brian followed seconds later, flooding her with thick ropes of cum. They stayed locked together, breathing hard, until the mess started to leak out around his still-hard cock.
Tiffany laughed softly against his neck. “Sloppy seconds already? You’re still hard.”
He was. The first orgasm had taken the edge off but not the hunger. He flipped them so she was on her back on the couch. He pulled out just long enough to watch his cum drip from her pussy onto the cushion, then pushed back in. The second round was slower, deeper. He fucked her through another orgasm, then came again, adding more to the mess already inside her.
When he finally pulled out for real, Tiffany scooped two fingers through the combined cum leaking from her and brought them to her mouth. She sucked them clean, eyes locked on his.
“Cum drink,” she murmured. “I like the way we taste together.”
They spent the rest of the morning in a haze of touching and tasting. Brian went down on her, licking his own cum from her folds while she trembled and pulled his hair. Tiffany returned the favor, sucking his cock clean, taking him deep until he was hard again, then riding him on the floor with her tits in his face.
By afternoon they were both exhausted and sticky. Tiffany suggested a shower. In the bathroom she produced the pink sex toy from earlier.
“I charged it,” she said. “Want to use it on me while you fuck me?”
Brian bent her over the sink. He worked the thrusting base into her already-used pussy, turning the motors on high. The dual stimulation made her knees buckle. He held her up with one arm around her waist and used his free hand to guide his cock into her ass, slow and careful. Tiffany’s reflection in the mirror was pure wrecked bliss—mouth open, eyes glassy, 38DD breasts pressed against the cold porcelain. The toy buzzed inside her while Brian fucked her from behind. She came so hard she nearly pulled the sink off the wall. Brian filled her ass, then pulled out and let her turn around and suck the last of the cum from his cock while the toy still pulsed inside her.
They cleaned up eventually. Tiffany kept the toy in while they made lunch, the remote in Brian’s pocket. Every time he pressed a button she would gasp and clutch the counter. He edged her through the entire meal until she was shaking and begging.
That night they slept in the same bed for the first time since they were kids. Tiffany fell asleep with his cock still inside her, soft and spent. Brian woke twice more to the feel of her grinding back against him, half-asleep and needy. He fucked her slowly both times, coming inside her again, until the sheets were ruined.
The following days blurred. They barely left the house. Tiffany’s body seemed to change under the constant attention—her nipples stayed sensitive, her pussy stayed swollen and wet, her 38DD breasts felt heavier in his hands. Whether it was pure psychology or something more, Brian didn’t care. She looked softer, riper, more available. He couldn’t stop touching her.
One afternoon the tension spilled into something else.
They were arguing over whose turn it was to do laundry—petty, stupid, the kind of fight siblings fall into when they’ve been cooped up too long. Tiffany shoved him. Brian shoved back. She swung. He caught her wrist. Within seconds they were on the living room floor in a full catfight, rolling, grappling, laughing and snarling at the same time. Tiffany got a handful of his hair. Brian pinned her wrists. She scissored her legs around his waist and tried to flip him. He let her, then used the momentum to pin her face-down.
That was when the tickling started.
Brian had always known she was desperately ticklish along her ribs and the backs of her knees. He exploited it without mercy. Tiffany shrieked, thrashing, trying to buck him off while laughing so hard she could barely breathe. He dug his fingers into her sides, then lower, teasing the sensitive skin just above her pussy. She was naked under the thin dress she had thrown on; the fabric rode up easily. Brian’s fingers found her clit and rubbed in tight circles while he kept tickling her ribs with the other hand. The combination broke her. She came hard, sobbing with laughter and pleasure at the same time, soaking his hand.
He flipped her onto her back and shoved two fingers inside her while she was still twitching. Tiffany’s eyes were wet. She grabbed his cock through his shorts and squeezed.
“Fuck me,” she demanded. “Right now. Use me.”
He did. Hard. The catfight energy carried over into the sex—rough, biting, scratching. Tiffany raked her nails down his back. Brian left bruises on her hips and the insides of her thighs. When he came he pulled out and painted her 38DD breasts with thick ropes of cum, then watched her scoop it up and drink it, licking her fingers clean.
Afterward they lay tangled on the floor, breathing hard. Tiffany reached for the sex toy again. She turned it on and pressed the vibrating tip against Brian’s balls while she sucked him back to hardness. The dual sensation made him curse. When he was ready she straddled him reverse-cowgirl and sank down, the toy still buzzing against his sac. She rode him that way until both of them came again, her walls fluttering around him while the toy milked every last drop.
They discovered the kissing ball by accident.
Tiffany found an old inflatable exercise ball in the garage, the kind people used for core workouts. She inflated it and brought it inside. The game started as a joke—whoever could balance on it longest while the other person teased them. It escalated fast. Tiffany sat on the ball in nothing but a pair of Brian’s boxers, rolling her hips so the ball shifted under her. Brian stood in front of her and fed her his cock. She sucked while balancing, the motion making her bounce slightly. Every time she started to tip he would catch her by the hair and pull her mouth deeper onto him. When she finally fell, laughing, he followed her down, yanked the boxers aside, and fucked her on the floor with the ball still half under her lower back, tilting her hips at the perfect angle.
Later they used the ball differently. Tiffany bent over it, ass in the air, while Brian worked the pink sex toy into her pussy and his cock into her ass at the same time. The unstable surface forced her to clench constantly. She came three times before he filled her, then collapsed, the toy still buried inside her, cum leaking down her thighs.
Body change became a quiet obsession between them. Tiffany noticed it first in the mirror—her waist seemed narrower, her hips wider, her 38DD breasts fuller and more sensitive. Whether it was the constant orgasms, the lack of stress, or pure fantasy, she leaned into it. She started wearing tighter clothes around the house, or nothing at all. Brian couldn’t keep his hands off her. He would catch her in the hallway and suck on her nipples until she was dripping, then bend her over the nearest surface and take her. Sometimes he would pull out and let her drink the cum straight from the source, other times he would push it back inside her with his fingers or the toy and make her hold it.
One evening they recreated the first time deliberately. Tiffany put on the same oversized T-shirt. Brian sat at the kitchen table. She climbed into his lap the same way, guided him inside, and rode him until both of them were shaking. This time when she came she whispered “first time incest” against his mouth like a prayer, and Brian came so hard he saw stars.
They kept the toy busy. Sometimes Brian would set it on a low pulse inside her while they watched a movie, the remote in his pocket. Every time Tiffany squirmed he would turn it up. By the end of the film she would be a mess, begging him to fuck her properly. He always did. Other nights he would edge her for an hour with just the bullet vibrator against her clit while he sucked her nipples and told her filthy things about being his sister, his cum dump, his toy. When he finally let her come she would sob and clamp around whatever he put inside her—fingers, cock, the larger toy—and then demand to drink whatever he gave her.
The catfight energy never fully left. They would wrestle for control in bed, tickling and biting and pinning until one of them gave in and got fucked senseless. Tiffany learned she could reduce Brian to incoherence by sucking his balls while the toy buzzed against the head of his cock. Brian learned that if he held her down and licked her clit while tickling the backs of her knees she would come so hard she nearly blacked out.
Sloppy seconds became a favorite game. Brian would fuck her, fill her, pull out, and immediately push back in, using his own cum as lube. Sometimes he would pull out and let Tiffany suck him clean, then push back into her mouth so she could taste both of them. Other times he would have her sit on his face right after he came inside her so he could eat the mess out of her while she rode his tongue.
Weeks blurred into a continuous haze of sex. Tiffany’s body kept responding—breasts heavier, nipples darker, pussy always ready. Brian’s stamina improved from pure necessity. They stopped pretending this was temporary. The house belonged to them. The rules belonged to them. Brother and sister, first time and every time after, toys and tongues and cum and laughter and the occasional full-contact catfight that ended with someone getting tickled into orgasm.
One late night Tiffany straddled him on the bed, the pink toy already buried in her ass, his cock sliding into her pussy. She leaned down and kissed him slow and deep while she rocked.
“I love this,” she whispered. “I love being your dirty little sister.”
Brian thrust up hard. “I love wrecking you.”
She came around him, then again when he flipped them and fucked her through it, the toy still buzzing. When he finally filled her he stayed buried deep, kissing her through the aftershocks. Tiffany reached between them, scooped the overflow, and brought it to both their mouths so they could share the taste—cum drink, shared, perfect.
They fell asleep like that, still joined, the toy on a low setting that kept her clenching around him in her sleep. In the morning Brian woke to Tiffany already moving on him, slow and deliberate, 38DD breasts brushing his chest. She smiled down at him, wicked and soft at the same time.
“Round one,” she said. “Or is this still last night’s sloppy seconds?”
Brian pulled her down into a kiss and answered by thrusting deeper.
They had all the time in the world.
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