'Oh my God!' Gwen muttered, her eyes locked on the incredible sight.
'Hey, sshhh! Not so loud!' Bill said in a hissing whisper, grabbing her by the shoulders and yanking her away from the private peep-show. 'Keep your voice down – you want them to know about this after all these years?'
He turned back to the hole and raised his hand over it, shutting out the light. Gwen saw now that he kept a small paper plug in the hole to shut out the sight and sound when he was not using it.
'How in the world did you ever get this set-up, you horny little bastard?' she giggled, grabbing his arms. It was like they were little kids again, sharing a secret from the rest of the world.
'I punched it in the wall one day about four years ago when I was alone in the house,' Bill grinned, sitting back on the edge of the bed. 'That was my big secret-agent phase, remember?'
'I remember,' Gwen said, sitting next to him, hips and thighs sliding together. 'You used to write down the license numbers of any cars parked within a block of our house – said it was for your secret reports!'
'Yeah, and it was the same thing when I made this hole – just playing around. I didn't really think about what might happen. It comes out barely over the top of the frame of that big mirror in their room, and you can't see it unless you know it's there.'
'The first night I'd already forgotten I had made it when, around midnight, I woke up because of a light in my room. I found out it was coming from the hole, and I looked through it. I almost shit in my pants, let me tell ya!'
'What did you see?' Gwen asked, even though she already knew the answer after taking a peek.
'The same as tonight – the same thing every night!' He raised his hands in a gesture of disbelief at his own story. 'I swear that for the last four years, virtually every single night, Mom and Dad get up at around midnight to screw around. The exact same time, every night!'
'I figure they started out like that when we were both little so there'd be no risk of our walking in on them, and they've just kept up the timetable out of habit now.'
'Why the hell didn't you ever tell me about it?' she asked, slugging his shoulder in mock anger. 'Four years of your own private peep-show!'
'Are you kidding? What was I going to say – 'Hey, Sis! Come on down to my room tonight and we can watch Mom and Dad fucking their brains out'?'
Bill leaned over and ran one hand up his sister's thigh, pressed to his, and drew his face nearer to hers. In the dim light Gwen saw he had a Cheshire-cat grin.
'Of course, if I'd known then what I know now…' He let his fingers slip farther up her leg, then dip to begin a gentle stroking of her moist pussy lips. She sighed and wiggled her hips about on the bed at his touch, pushing her legs apart to give him more room to reach her dripping twat.
'It'll be your ass if they ever find out about this,' she whispered, closing her eyes and letting her head roll back on her shoulders as little tremors of delight ran up and down her spine. She leaned farther back, supporting herself with her elbows, grinding her ass in rhythm to his slow, easy finger-fucking.
'That's nothing,' Bill went on, now slipping his index finger into the moist channel of her box, speeding up the motion of his finger-fuck.
'If they knew I had the hots for Mom they'd both really freak out!'
'Mom!?' Gwen asked, her eyes snapping open.
'Yeah, I – oh, shit!' Bill snarled, suddenly realizing just how much he had revealed to her. 'I shouldn't have told you that!'
'Ha! Are you kidding?' Gwen giggled, slipping one hand quickly over her rounded hip to capture his frigging hand at her cunt. 'You've just fucked your own sister twice, and now you've got your hand up her pussy, but you're nervous about admitting you have the hots for Mom?'
Placing her other soft hand on his shoulder she pulled herself back up into a sitting position next to him, then put her pouty lips to his ear. 'If it'll make you feel any better, baby brother, I'll make a confession, too. I really and truly would love to fuck the hell out of Daddy!'
Bill turned his head to his sister, and Gwen kept her face still so that their lips were less than an inch apart. She felt him quietly add a second finger to the first hard-working digit between her legs.
'Damn! You're kidding!' he said, that same wide grin again spreading over his face.
'Horny as hell, aren't we?' she snickered back, then brought both her hands up to capture his head between them, and hungrily mashed her open mouth to his, sucking on his lips and mouth in a passionate kiss.
'I've got an idea!' she suddenly said, breaking their kiss with a wet smack. Her eyes shone with lustful little gleams as an erotic notion took root in her mind. She pulled his sticky fingers from her pussy and guided him back to the peep-hole, removing the plug herself this time.
Pressing her eye to the hole, she again sucked in a deep breath.
Her mother was still sucking in much more than a breath. Carol had by this time managed to get her husband's cock completely down her throat now, and was slurping and gasping into the hairy base of his pubes, working her head up and down as though she'd had nothing to eat for a month and Ken's huge cock was the most satisfying meal in the world.
Both her hands were busy playing with his balls, squeezing and milking them as she twisted and turned her mouth around his shaft. Then she started pulling her mouth back up to get another breath, and Gwen gasped again as she watched her father's long tool slide out of those wildly working lips. Her mother's hungry mouth was leaving behind a glistening coating of drool as she slid up the hard meat shaft, and the long prick was rubbed red from the loving friction of her lips and throat, gleaming and throbbing.
'Good God, Billy!' she whispered, turning back to her brother. 'With parents like that, no wonder we're so horny!'
She turned and placed her back to the cool wall, then slowly bent her knees and slid down until she was squatting just under the peep-hole, her face level with her brother's groin. Once again her eyes were drawn to his waving prick, hard to see in the dim light, but so close to her face that she could smell its musky odor as the crown dribbled a small drop of pre-cum juice.
'I want you to watch them and describe everything Mom does to his cock while she's sucking him off, and I'll do you!' She reached out and grasped his cock, thrilling to the touch of his sticky shaft, thick with the combined juices of both his last climax and hers.
Bill felt a similar shiver of pleasure run through his body as her cool hand circled lightly around his prick, jerking on it delicately as she pulled him to her. 'Oh, YEAH!' he grinned, scooting forward until he had his face to the eye-hole and his groin right in his sister's face, his cock rubbing over her cheeks.
'Mom usually goes down on him for a while, and then they fuck like crazy! When they change, you can watch and tell me, and I'll fuck your gorgeous cunt again.'
Gwen gave no reply as she was too busy with his hard cock. She ovalled her lips and dipped her head down, flicking her tongue over the rubbery surface of his cock-crown, licking up that gleaming pearl of preseminal fluid from the thin slit in the tip. Although she had meant to slowly work him back up in passion again, the moment Gwen had her first taste of the slightly salty juice of his cock she went over the edge again herself. Too much had happened that night for her to go through all the preliminary build-up she liked to do with her cock-sucking. She stretched her lips open wide and closed them around the fat tip of her brother's dick, capturing the entire bloated crown in the wet cavity of her mouth, then pushed her head forward, letting her lips slide tightly down the slick, slightly sticky skin of his long shaft, cramming as much of his hot meat as she could get into her mouth.
'God… oh, God! Gwen, what a mouth…' Bill was moaning. But remembering that he had a part to play, too, he leaned forward and pressed his eye back to the peep-hole. His toes curled up in pleasure as his sister worked frantically on his straining schlong, while he watched his voluptuous mother going after his father's cock with the same sensual intensity.
'Gwen… oh!… she… Mom's got both of her hands on his balls… and she's squeezing them… do that!' His voice came out in ragged little bursts, the double strain of trying to concentrate on describing the action in their parents' bedroom and letting his sister suck him off making his breath come harder and harder.
Gwen eagerly did as he suggested, reaching up to grasp his dangling balls in their lightly-haired sac. She kept her mouth tight around his cock, sucking and slurping, a thin line of drool running from the corner of her mouth now as she salivated hungrily around her mouthful.
She hefted his balls with both hands, liking the feel of his goose-eggs in her palms, then brought her hands
