"That's Sara."

"That's Sara." You tell him, heart pounding. There's an adrenaline rush from admitting this. You're showing your girlfriend naked to your brother, and now you're telling him it's her!

"No, nonono!" Michael responded, surprising you by implying he'd already assumed it was your girlfriend you were both wanking to. "Her!" pointing intently at the screen.

Looking into the background you catch a glimpse of what He saw. You assume immediately that Tamara or Rachel, Sara's mum, must be visible, but the girl was too blonde and too chubby to be either of them. She was drinking a coke, naked against the kitchen counter, idly touching her pussy.

You cock started to get hard again. "That's Chloe." You say, recalling her as one of Sara's friends from University. Michael returned to masturbating, his dick appearing repeatedly between the fingers of his closed fist, still not cleaned of the cum from a few minutes before.

"And they're naked like this?" Michael asked.

You considered your response for a moment, before leaning your head back slightly, licking your fingertip, and starting to finger your nipple. "In Sara's, there aren't any rules. You can do what you like, wherever you want." With a raised eyebrow and a glint in your eye.

Responding to Sara's message, you tell her that she's beautiful and that Michael agrees.

Sara types back, flirting and asking if Chloe can join you both today. Its fine with you as long as she sees no problems with you fucking Sara in front of her.

Michael looked intrigued. "So," He'd clearly been forming this thought for some time, "if I wanted t-"

A burst of noisejolted through both of you and your bedroom door, just to your left, flew open before you could register your sister Charlie shouting a wakeup call and a summons to breakfast over the top of her own knocking.

She hadn't hesitated, and she was still knocking on the door as it swung into the room, revealing both you and your brother naked with your hard cocks in hand and porn on both screens.

Having less than a single moment to react meant to her appearing in her pink Onesie you were both frozen in place when her eyes finally adjusted and she took you both in.

The only sound was the shower running in the background across the hall. Like deers in headlights you both, white faced and clench-jawed, hold your ground as a light comes on behind her eyes and her face splits gently into a hungry grin.

Thought drifted across the front of your mind. 'What will Michael do? How will he react?' You knew how your body was reacting, you'd now let Charlie watch you wanking three times. You'd talked about living like Sara's family. You'd pissed and cum on her, and you'd both fucking loved it. Surely she couldn't have a problem with this now?

Holding her gaze, you're conscious that she hadn't moved to close the door at all, and was in fact opening it wider and exposing you both more fully to anyone on the landing outside. If your parents or Lucy walked past, they would clearly see everything.

God that made you horny.

Still fixing her with your stare, you start to wank again. Charlie groaned.

"I don't mind if you wank yourselves off-" She said, her eyes flicking between your cocks. A grunted moan from Michael told you he'd followed your lead and was now pumping his dick again, too. "But I said breakfast is getting started now, so you'll need to come downstairs." She licked her lips lasciviously as she finished.

Smiling a dazzling an definitely horny smile, she spun gracefully on the spot, revealing her onesie's bum flap was completely open. She had no underwear on inside, and her bare bum stuck out obscenely through the large square opening.

She was being so slutty and her casually flashing you was making you more turned on that Michael was here experiencing it, too.

"Your flap... is down." gasped Michael between slow, intense pumps. Drool audible in his mouth.

Charlie giggled throatily and bent further, sticking her arse out and wiggling it slowly from side to side. "Is it?" She asked with an audible grin in a sultry voice, reaching back with her hands. "You two can look all you want, I did it on purpose." She breathed. She had our complete attention. Her hands grabbed her cheeks and pulled them apart as her legs became completely straight. Bent almost completely over, her hair touching the carpet of the landing, and her straight legs, gave you a complete view of the inside of her pulled apart cheeks.

That thick bum with it's smooth clean puckered hole was displayed shamelessly for you. Not moving from this position, she continued her explanation. "I ripped off the buttons so I can walk around and flash everyone in our family."

Your hands were a blur now on your swords and you turned to Michael and made eye contact with him.

He seemed in another place entirely. almost totally engrossed in Charlie's big, shaved bum. You indicated towards her as you wanked with your lip between your teeth, and his nod of agreement spoke with his whole body of disbelief at how lucky they were for a sister as sexy as Charlotte to be doing this right now. As precum flowed freely from his purple head and his legs tensed and flexxed as you both approached another cum, five minutes after the last one.

Turning back to Charlie, you fully forget that you were supposed to be heading downstairs for breakfast and fail to notice the shower has stopped running.

Your sister is still bent double presenting her ass and part of her smooth pussy through her purposefully damaged sleepwear when her voice breaks the silence. "Do you like wanking to my bumhole?" You were so close. You had to clear your throat to even mumble "Mmhmm!" and nod. "Do you- Oh hi, Mum!" Charlie suddenly said brightly.

Your eyes go wide and your hand flies off your cock and your other hand off your balls as Charlie, already standing up straight pretending to pick something up off the floor and swing the door to your room closed with you and Michael inside. The last sliver of her you see as your mother comes out of the shower is her bare cheek as she tells your mother you'll both be downstairs for breakfast as soon as you finish getting dressed for the pool. A really quick lie and one that would have both you and Michael having to head to breakfast in your shorts alone.

Sitting for a moment in silence, you turn to Michael and realise he's recovering from three or four separate heart attacks. Being caught by Charlie, wanking off to her, almost being caught by our mother and then being saved at the last second seem to have drained him completely. His dick was still a pillar of red and purple brick but his face was white as a sheet and his breathing seemed measured.

He turned slowly to you. Just his eyes. "What is going on?" He asked.

"Well," you say. "Me and Charlotte want to live like Sara's family." You say like stepping out onto ice. "Like this-" you gesture to each other's naked bodies and hard ons, "Like Sara." you say again sort of weakly, pointing back to the video of Sara pissing herself all over her house.

Michael's eyes flick from the screen to you, and back to the computer, then at his own dick, and finally he started to stand, looking distant and apparently unaware that his gaze was fixed on the door where he'd last seen Charlie.

Fishing out a pair of swimming shorts, he pulled them on and tried to calm his pole by finding peace and centre. It seemed to be working. You had a naughty idea. Instead of shorts, you pulled out a towel and nude, wrapped it around your waist and secured it firmly. Your hard on didn't go away. You pointed it out to your brother. "Look, I wonder if anyone at breakfast will notice it."

"Are you going to swim naked, then?" Michael asked skeptically, as he opened the door and stepped out onto the landing.

"Everyone's going to be busy today, so there'll be only us around after breakfast anyway." Your parents had separate playdates with their friends, your dad fishing and your mother doing a day of drinking and nice food in the city. And Lucy and Charlotte and Michael had all now seen you masturbating. You had no problem with any of them seeing you strutting around fully nude.

Rounding the bottom of the stairs your eyes fell on your sister's naked ass at the kitchen sink as she poured a glass of water. Your parents were at the table, dressed normally for them, but they still looked attractive. Lucy and your Mother were both staring at Charlotte's bum, but surprisingly your mother said nothing. Typically she had tried to discourage bad behaviour in them, even things she had no problem with, but wider society did. Now neither her nor your father were doing anything.

Swaying her hips as she moved, Charlie seated herself when you and Michael did, and though he was still obviously distracted by the day's earlier events, he had enough cognition to play it cool in front of Charlie and our parents. You hoped someone had seen your arousal before you sat down.

Digging into your food, you began to wonder how Charlie's bum would feel on the cold chairs, would her pussy being wet feel as cold as you imagined? Glancing at her told you enough. Flushed, her chest rose and fell as she not-so-subtley wiggled her hips and rubbed her obviously slippy smooth pussy against the white leather covered seat cushion.

Trying to look focused on your food, you attempted reconnaissance of the other's at the table. Lucy had one hand on her forehead as she stared downwards finishing the last of her breakfast, your father mirrored her, seeming much too engrossed in his food to be entirely genuine. Your mother, again, was watching Charlie like a hawk, but saying nothing.

You remembered what Charlie had said about your mother knowing about your porn habits. She really hadn't said anything to you about that, ever. But thinking of it, she definitely must have noticed. ****, golden showers, public nudity, mutual masturbation and group sex were staples of your masturbation sessions. She really knew it all? Was there anything that would make her speak up and object?

Charlotte, instead of making herself cum, seemed to be calming down, and becoming more about eating. Lucy was scraping her plate. She turned on the tap and began to wash it as she addressed you.

"Sara said her and Chloe are coming over today, and tomorrow." You shifted your attention and your bone from Charlotte and your mother's intense and unreadable gaze to Lucy, who was wearing only a T shirt which didn't reach the bottom of her juicy bum and an orange lace thong. Plenty of skin was visible through the flimsy material and it didn't even attempt to conceal her cheeks. They jiggled with her motions as she cleaned her dish. "So me and Charlotte want to hang out with her, too." She turned and you could make out some of the details of her pussy through the lacy front where her legs met. "And we want today, and you and Michael can have tomorrow. Deal?" She spun, flicking off the tap and stacking her plate to drain before padding over to the laundry basket, and with every eye in the room on her arse, reaching down and stripping her knickers off.

Her soft crack had eaten the garment and the malleable cheeks gripped it as she tugged it free and stepped her soft bare feet out and planted them back on the floor. Spinning the thong in the air once flamboyantly she flung it down into the basket before her ceremoniously, one hand on her cocked hip and the other (with a bobble around her wrist) hovered above the hamper.

There was no no hiding your erection under your towel and you didn't even try, her voluptuous arse hanging free beneath the hem of her form-fitting t-shirt was expansive and wonderful. Reaching up and shifting her weight back and forth she tied her hair into a knot on the back of her head and paraded shamelessly past all of us, flashing her pussy the whole time, out of the kitchen space to plop down on the couch, legs apart, and turn on the tv, phone in her other hand.

By this time, you'd forgotten her demand and the "deal" she'd claimed, and could think only of her bottomess parade. Your eyes caught your mothers. She was looking knowingly and almost predatorily at you, and your erection, and her expression told me she had been fully aware of what Lucy was doing, too. And she very carefully, had still not said anything. You were now convinced.

Your parents were not going to intervene if your sisters were obscene. Would they offer you and your brother the same kindness?