"Ahhh," Tom moaned, "yeahhh."
Becky's hand moved faster and smoother than ever now with the layer of spit between it and the loose skin of Tom's hard-on. She relaxed her wrist and beat his meat just as he had taught her during their few but furious days of fucking.
As she massaged his cock, she made sure that her fingertips stayed against the sensitive vein that ran the length of his prick-shaft. Becky didn't understand why but her brother was extra-sensitive on that spot and so she massaged it, wanting to please him as much as possible.
Above her own panting she could hear her brother's loud breathing. They were turning each other on with their hands and fingers, making their young fuck-parts hum with arousal. Becky had never dreamed that anything could feel so good as fingering her brother while he fingered her and they both spied on another couple fucking.
Inside the house the young girl that now making push-up motions with her arms. Sometimes her upper body was flat against the rumpled bed, her small tits squished beneath her. Other times she held herself up, her back straight, her tits pointing downward, two pink cones of flesh. But whatever she did seemed to excite the man more, and he fucked her with quicker strokes than ever, jarring her with his fucking prick.
Becky found herself moving with the same rhythm as the girl who was getting fucked. As the girl took the man's cock, Becky rocked forward and back, helping her brother fuck her with his pointed fingers. The night air was cool against the soft skin of Becky's bare legs, but up toward her crotch she was as hot as a pistol.
With one hand tight around her brother's prick and the other bracing her up against the trashcan, Becky could move only a little. But even that small bit of motion was enough in this sexy setting. She watched the man move his hands from the girl's waist to the soft cheeks of her ass. His fingers dug into her pliant flesh and the girl opened her mouth, obviously crying out in pleasure and pain. She wiggled her ass in the man's grip and Becky felt her own pussy lurch. It was the most erotic thing she had ever witnessed, even better than the sexy photos that she and Vicky had shared.
Although he was an experienced voyeur and had watched this particular couple fucking before, tonight seemed special to Tom, too. His dark head bobbed as he jammed his fingers into his sister's pussy and moved with her hand, helping it jack him off. Her cunt-juice felt oily as it filled his hand and ran down to his wrist. How he wished he could fuck Becky right now just like the man in the house was fucking the young girl. Who was she? Tom wondered. Was she his daughter, or maybe his daughter's friend, or maybe a babysitter? Tom's horny mind went wild with the possibilities, and he fucked Becky's cunt with his hand all that much better.
Becky rocked from side to side, making Tom's fingers move more inside of her. Sometimes he gouged at the soft inner tissues of her pussy with his fingernails and it hurt her a little bit. But her soothing juices and his usually satisfying finger-fucking were quick to ease her pain and she thrust out to meet him, her cunt sucking around his jamming digits.
"Think she's his kid?" Tom panted, his mouth very near to his sister's ear. The question caught Becky off guard, and she only moaned in response.
"She can't be his wife, do you think? She doesn't look that old, and I can't see any ring," Tom continued, his hips thrusting up through the circle of Becky's fingers as he spoke.
Becky moaned.
"Do you know her?" he asked, quickly looking over at Becky's flushed face.
Becky absently shook her head.
Tom grinned when he saw how hot she was. Her whole face was distorted with passion and her tongue hung out the corner of her mouth. It was no wonder she couldn't answer him, the boy realized.
"You're almost there, huh?" he asked, his laughing eyes now trained on Becky.
"Uh-huh," she gasped, her eyes rolling back in her head as he rubbed his greasy fingers across her clit.
"Then let's go!"
Becky almost lost her delicate balance as her brother tore into her cunt with a new kind of frenzy. His fingers, now three of them, filled the mouth of her cunt completely and he let them fly in and out of the fluttering opening. Then, to further her pleasant torture, he began to revolve his thumb over her clit while he fucked her with his other fingers.
"Oh Tom!" she gasped as her fingers, too, increased their speed up and down the shaft of his prick.
For many minutes the two teenagers pounded each other like never before. Becky bit her bottom lip with the power of her efforts and Tom panted like a stallion, his balls rolling around until they slipped from the confines of his jeans and dangled in the night air. As Becky pumped his prick, his balls began to dance, jerked and jarred by her violent fucking motions.
Their eyes grew wider and wider as it became apparent that the man in the house was about to come. His fucking strokes became frantic and then he jammed his cock into the girl completely and bent forward, over her back, gripping her hanging tits and hugging her to him. Becky and Tom could see the way his ass twitched and they each imagined the thick stream of jism that he was depositing far up inside the young girl.
Tom's prick vibrated in his sister's hand as he watched the little brunette grind her parted ass-cheeks against the base of the man's creaming cock. Her cheek was against the bed and her back sloped upward to meet the man's hairy belly. Her ass twitched back and forth just a little bit, wringing the last of his come from his beefy balls.
Becky slammed her hand from the base of his prick-head to the root of his cock, holding his shaft tightly in her sweaty hand. Tom jerked his hips too, and together they brought him off just as the man in the house began to stir, picking himself up off the back of the kneeling girl.
"Yeah, Bekkky!" he gasped, keeping his voice low. "Uhhh!"
Becky's hand jacked furiously on his spewing prick and his cream flew off in every direction. Becky took a few drops of it against her jacking hand and a few more on her bare legs and the side of one cheek. She stuck her tongue out and tried to lick away the bits of his cream that dotted her face.
As he came, Tom let his fingers slack off in their fucking of her. But his come was a quick one and before the man had even pulled his cream-soaked cock from the cunt of the young girl, Tom's moment had passed and he again focused his efforts on bringing off his sister.
Becky had been so close for so long that it didn't take much for Tom to fuck her climax right out of her. Of course, he had some help as Becky watched the large older man coax the girl down onto her back and then fall betweeen her splayed thighs to lick up his own cream.
"Oh fuck!" Becky gasped, the combination too much for her. "Here I come!"
"Do it baby, yeah!"
As much as he wanted to see the old man eating the young girl, Tom wanted to watch his sister come even more. Now, in the subdued light, he saw her face contort and her eyes roll as he felt her pussy dance around his embedded fingers. He kept his hand moving and it slid around in her juicy, climaxing cunt, instantly making the boy's cock hard as a rock again.
Becky sighed and moaned, her knees waving apart and together around her brother's pumping hand. The knuckles of the hand that gripped the trashcan went white with the effort as Becky swooned with pleasure and satisfaction. Her cunt pulsed with her climax, one moment feeling very taut and the next very loose and open. Tom kept fucking her until the last shudder passed through her body. Then he gave her a moment to recuperate before he patted her moist, naked ass and shocked her back to reality.
"Come on," he said, struggling to get his new hard-on into his pants. "We better get home before Mom has a cow."
He took Becky's hand and helped her unsteadily to her feet. Like a zombie she pulled up her pants and ran her fingers through her hair. Then, with Tom waiting to follow in a few minutes, she took one last look at the hot pussy-eating that was going on in the house and hurried off toward her home.