Katy had started dating an older man, Jayne had noted, and she would watch from her front bedroom window when they returned for their dates. From her bedroom, she could see directly down and into the front seats, the perfect view. Jayne leaned up against the window for a slightly better view, her breath condensing on the pane, a finger pressing her erect little button through the white cotton, hard! Jayne eagerly watched the show, slutty little Katy had started by sucking an impressively long cock like a pro. 'The girls got skills,' she thought, but now her man was pressing her head down onto his cock whilst fingering her tight little virgin hole. Jayne felt hot with jealousy. Her lip quivered as her cum began to drip down her left leg, her right knee firmly on the small chest of drawers, giving her easy access. She swapped hands and stuffed her cummy fingers into her mouth, wishing it was her having a large cock forced down her throat whilst unfamiliar fingers explored her holes. She did enjoy the fantasy of being dominated.

The show was brief, but Jayne came with a grunt and sneer, watching Katy swallow her man's load.

"You're a good little cumslut!" She said out loud.

Weeks had gone by, and Jayne was again jealous of the way Adam's eyes followed her little sister Katy around, either her phat ass was on show in tight pants or her huge nipples on those tight, perky, fucking titties! Katy loved to go commando in tight, revealing hot pants and tank tops. Both of her assets on show, her perky little tits, annoyed Jayne most of all, as her nipples didn't point the way as Katy's did. It wasn't cold, but her nipples stood to that annoying attention through the thin fabric, and they commanded 'his' attention!

Jayne straddled Adam, dry humping his leg and rubbing her hand over his crotch, making his cock hard, leaning in for a deep, passionate kiss. She stuck her tongue deep into his mouth, but still, he didn't take his eyes off Katy's perky tits or phat arse.

"Little bitch is going to get it!" She thought to herself, but as another week went by, Jayne pondered Katy's punishment for stealing her boyfriend's attention. Jayne thought back to watching as Katy's mouth and pussy were used by her boyfriend, and slowly her idea to punish her little sister blossomed.

Jayne's plan day finally came, Katy was unusually, but seasonably, dressed, as it was very cold outside, wearing an oversized, but cosy jumper. Jayne stormed into Katy's room, crashing about. She was clearly annoyed about something. Katy knew best to leave well the fuck alone, which she tried in vain to do.

"I want your help," Jayne said, searching through Katy's wardrobe, her cupboards, her chest of drawers, and even her bedside cabinet. The last of which she removed a realistic black dildo. "And... You need to change!" Jayne said, fingering the tip before throwing it back. Katy pretended that it never happened.

"But this is so cosy and warm!" Katy responded, pulling the collar of her big, woolly jumper up over her face in defiance. Jayne displayed her annoyance by grabbing and then pulling the top over her head in one movement. Katy and Jayne both blushed as Katy wasn't wearing anything underneath. She was naked, and now her large nipples stood erect.

"I suppose you don't have any panties on either!?" Jayne said, pulling at the front of Katy's pants to reveal she was entirely correct. "Good gosh, who fired the gardener?" Katy blushed. "No, no, no. This will not do." Jayne muttered and marched Katy to the bathroom. Katy quickly found herself sitting spread-legged on the side of the bath, watching as Jayne meticulously trimmed her bush. She assumed that would be the end, a nice, neat bush. This was not the case, and Jayne shaved her smooth. Afterwards, Jayne left to find her some clothes, and Katy stood in front of the mirror inspecting her now bald pussy.

When Katy finally returned to her room, Jayne had picked out a tight white top and the shortest black skirt she could find in Katy's wardrobe. She had also raided Katy's alcohol stash and had poured herself and her sister a shot each. Straight, how it should be.

"Isn't it a little early?" Katy questioned.

"Drink up and change into this now," Jayne said, ignoring her annoying sister's questions.

"But I want my jumper, it's so big and comfy, and... and..." Jayne shushed her with a hand.

Katy dressed in an almost matching outfit with Jayne. White V-neck, short black skirts, knee-length white socks. After some lippy and mascara, all was done. After all, there is no need to overdo natural beauty.

All dressed now, Jayne practically dragged her sister down the stairs.

"What are we waiting for?" Katy slurred a little. Jayne eyed up Katy's large, rock-hard nipples poking through her top.

"Adam is on his way." Katy smiled. Adam was always so nice and that smile... Katy's attention faded for a moment before the car pulled round the corner, bringing her back to reality. Adam was a year older than Jayne, but, while not tall, was still taller than both Jayne and Katy. He was dressed casually as always.

Adam entered the always unlocked front door. His eyes almost popped as he walked through, catching an eyeful of Katy. Jayne made sure to pounce in quickly to give him a deep kiss, sticking her tongue deep into his mouth to remind him who he'd come to see. She whispered something before turning back and smiling at Katy, admiring her handywork. Adam was now free to take in the sights. Katy blushed and tried to cover her modesty.

Jayne held Katy's hand and escorted her to her boudoir. Adam followed those phat fuckable asses all the way, but made himself comfortable on the bed immediately upon entering the room. He hadn't been told any specifics, but he had high expectations. Katy stood before the bed, frozen in place. Then Jayne stood beside Katy and lifted both of their skirts to show off those smooth cunts. Adam smiled up at his eager little sister sluts. Her pussy twitched as Jayne swooped in behind her, kissing her neck and grabbing her breasts. Katy's eyes closed, but Jayne and Adam's locked. Her mouth widened as Adam bit his lip, watching intently. Jayne lifted her little sister's top, revealing those perky little tits to her boytoy. Katy felt very self-conscious and tried to cover with her hands, but didn't want to upset her sister, so instead cupped them and leaned forward towards Adam, who gingerly tweaked her large nipples before leaning back on the bed fully. Jayne continued to kiss Katy's neck and fondle her breast with one hand as the other made its way down the front and up her skirt.

Katy wasn't sure exactly when it happened, but as Jayne gently rubbed her nipple and clit from behind, she caught sight of Adam slowly stroking his very thick, rock-hard cock. Jayne noticed too.

"Look at what you've fucking done with all your teasing!?" she whispered into Katy's ear. "Now, be a good little slut and suck that cock like you practiced on your boyfriend to make up for it." Katy turned to look at her sister with a shocked expression. Jayne was stern and determined. "Go on, show Adam what a good little cock sucker you are." Katy blushed but obediently turned and leaned down to take his cock into her mouth. He wasn't anywhere near as long as John but had nothing to be ashamed of, especially considering his girth.

Jayne cuddled up beside Adam, stuck her tongue into his mouth as Katy's head began to gently bob up and down in his lap, slurping and gulping noisily. Jayne pulled back and watched a moment before "helping" Katy by pushing her head a little deeper every time she bobbed down. She knew she wasn't going to get him down her throat, but eventually he did hit the back, and as she did, she gagged a little. Jayne held her there, cock in throat, whilst she deeply kissed Adam again for a good long moment before releasing them both. Katy gasped as his cock released from her throat. Jayne moved behind Katy as she resumed sucking, but found herself pushed sideways, landing on her back in the middle of the bed. Jayne straddled her little sister's face, grabbing her hair.

"You suck dick, but do you eat pussy as well, sister!?" Jayne rubbed herself over Katy's nose and lips before she gingerly opened her mouth and stuck out her tongue. Adam, now moved off the bed between Katy's legs, spread her large labia lips, and entered slowly. He was going to enjoy this tight young thing. It had been a hot minute since he'd stretched out an unfamiliar wet hole. Katy and Jayne both moaned as Adam's thick cock stretched this tight hole as she lay under Jayne. Katy felt smothered by Jayne's pussy rubbing furiously over her tongue. Adam had a different sister's breasts in each hand as he pumped harder now. Jayne's pussy juice trickled out and dripped into Katy's mouth, and as she wasn't expecting this, it made her slightly gag, a little.

Adam, not wanting to waste this opportunity, moved Jayne off her sister before flipping Katy over onto her knees. He gripped Katy's hair in his fist, pulling tight, so she faced him in the mirror by the bed. He wanted to see her face as he gave her a good, hard fucking. He aimed squarely at her hairy, creamy, gaping hole and began to push in. Jayne grabbed his rock-hard member, guiding his head to Katy's other, until now, virgin asshole. Adam looked at Jayne for confirmation, and their eyes locked. Jayne moved her eyes to his cock and back again to his, she then used her hands to pull those phat ass cheeks wide apart. Adam smirked at Katy's reflection. He'd fantasised about abusing Katy's arse from the first time he saw that phat rump and needed no more encouragement than that. Slowly but consistently, he pressed against and into her asshole, his large bulbous head popped in after a little force. Katy squeaked as he watched her face. Her mouth, and then her eyes widened, but she never made a further sound. She looked back up and into his eyes, the last of her innocence lost. He grinned and began to pump into her arse. She was tight, but he was determined she would take him, and so he pumped deeper with every thrust. Jayne had moved for a better view. Now watching as her little pussy winked, she stuck two fingers in deep, massaging Katy's tiny clit with her thumb. She used her other hand to squeeze and play with those tits she was so jealous of.

Katy watched Adam and Jayne in the mirror as she recalled John violating her virgin asshole with his fingers, she'd rather a finger now instead of a thick cock, and with each thrust she took a sharp intake of breath. Jayne busily stuffed more fingers into her dripping wet slit whilst swapping breasts for balls, squeezing Adam's huge balls tightly until his groin spasmed, releasing a bucketload of pent-up cum deep into Katy's once tiny but now stretched out asshole. Adam pulled back and continued to shoot thick ropes over Katy's back before collapsing backwards on a nearby chair. Katy didn't dare move as Adam's cum flowed out of her ass and mixed with her own cum flowing from her gushing pussy.

"Best to keep this our little secret." She scooped a glob of cum from Katy's lower back. "Don't want John finding out you've had another man cum in your asshole instead of his." At this, Jayne forced her cummy fingers in Katy's open mouth. She bit her lip and smiled as Katy looked at her in sheer panic, not quite knowing what to do, so she sucked the cum off and gulped it down. Jayne walked around behind Katy, giving her arse a good slap, leaving a red handprint. Katy squealed, but Jayne noted grool dripped from her pussy. Jayne smiled an evil smile before sticking a finger into Katy, as she caught Adam's eye as he gently stroked his cock.

"Oh, you like that!?" She made a show of adding another finger, then another, then another... Then, grabbing Katy's hair and pointing her face at Adam, she fisted... HARD!

Jayne leaned into Katy's ear, still with her fist fully inserted.

"Now. Get out of my room!" Katy pulled away from her sister's fist, which popped from her hole, then rushed out naked with cum dripping from her hole down the back of her leg.

Adam rubbed his slowly relaxing thick stump. Cum still pumped from the end and down his cock over his enormous balls.

"You're so mean to her..." His face spasmed into a smile. "Come and clean your dirty slut sister off my cock with your tongue."

Jayne dutifully obeyed and crawled over before nestling between his legs, sucking the cum off his balls, savouring his salty spunk mixed with Katy's sweet pussy juice. Jayne wished she'd had a taste of her sister. Maybe there will be a next time, she thought.