In the next few afternoons, Becky and Tom spent plenty of time in bed together. They experimented, learning different ways to please themselves and each other. Sometimes they fucked hard, and sometimes they fucked tenderly. But always they fucked with one ear open, ever alert for their mother.
As they grew more comfortable with their new-found sexuality, Becky relaxed enough to confide in her brother her excitement when it came to watching other people fuck. Tom was thrilled – and relieved – that Becky did not hold his voyeuristic tendencies against him. So, each pleased that the other was also erotic-minded, they decided to go out together one night and see what sexy scenes they could discover in their neighborhood.
They devised a plan where Tom would tell their mother that he had to go over to a friend's house one evening to work on a school project. That same evening, Becky agreed to leave her piano lessons a bit early, telling her teacher she had to get home to help her mother. The plan went off without a hitch and the two met just as it was getting dark in an alley not far from their house.
"We'll try the house on Guava first," Tom suggested, leading his sister down the back passageway. "They like to have a quick evening fuck once in a while."
"You mean you've watched them before?" Becky asked, trying to walk quietly.
"Sure! Did you think that I just started, like you?"
"Well, no," Becky replied. "But I didn't know you knew so much about what other people do."
"I don't really know much at all," Tom laughed. "I just know who likes to fuck and when – and who doesn't close their curtains. Now come on!"
They hurried down one block, and up the next. Ahead of her, Becky could see one brightly lit window and she felt her stomach tighten when she realized it was their goal. Tom's hunch had been right. There were people in that room!
"What'd I tell ya?" Tom giggled. "Those horny sons of bitches can't keep their hands off each other!"
Brother and sister moved around the trashcans across the alley from the back bedroom window, covering themselves as best they could. Then they crouched down and Becky's eyes went wide when she got her first good look at two people actually fucking.
"I can't believe it," she sighed. "Look at them go! How can she take it?"
"I don't know," Tom mumbled. "But I know I can't. Feel this!"
He took her hand and guided it to the front of his pants. Without taking her eyes off the hot sight in front of her, Becky felt his hard-on pounding against the fly of his jeans. She gave it an absent little squeeze and then let it go. Watching other people fucking was such a tremendous new experience, it took all of her concentration.
Inside the sparsely furnished bedroom, an older man and a very young girl were both naked on the bed. The girl, her face turned slightly away from Becky and Tom, was on her hands and knees and the man was taking her from behind with long, powerful strokes. The short dark curls on the girl's head bounced when he rammed his cock into her, but she seemed to enjoy it. She held her body taut and absorbed his fucking power by slamming her ass back at him each time he filled her with his cock-meat.
As if from a distance, Becky heard her brother slide his zipper down. Then she sensed as much as heard him start to stroke his rigid prick.
Becky was getting plenty hot herself. The idea of spying on other people while they fucked had excited her but not nearly as much as actually doing it did. She could feel her cunt getting all soft and squishy and she shifted around, rubbing herself against the crotch seam of her jeans.
"Turns you on, huh?" Tom whispered, his hands moving on his cock while he grinned at his obviously excited sister.
"Yeah," Becky croaked. "Even more than I thought it would."
Tom laughed, a low and dirty sound. "You gettin' wet?" he asked.
Becky didn't have to answer because her brother reached over and cupped the crotch of her jeans. Becky knew her cunt was very juicy and from the way her brother sighed she knew too that her cunt-cream had soaked the crotch of her pants.
"Runnin' like a river," Tom sighed, massaging her wet crotch and feeling it become even wetter.
In her crouched position, Becky opened up her thighs and balanced herself on just her tiptoes. With one hand she held onto a nearby trashcan to keep from falling. She pushed her cunt back against her brother's groping hand and began to pant, his fingers thrilling her even through the covering of denim.
"Wait a minute," she finally sighed, pulling away from Tom.
His hand again free, Tom went back to jacking on his cock while Becky quickly popped the snap of her jeans and stood up just long enough to pull them and her panties down around her ankles. Then she crouched back down beside him, her naked cunt giving off an odor in the night air.
"Yeahhh," Tom sighed, guiding her one hand to his prick and then going back to work on her pussy, "this is gonna work out just fine."
Becky whimpered her agreement as her fingers closed around the swollen shaft of his prick and his hand pressed against her steaming cunt. She felt a gob of her pussy-juice ooze out and smear his palm.
Tom's cock was cool against her fingers, but after just a few quick strokes, it grew hotter and straighter than ever. She glanced down at it briefly and noticed the sexy way that it stuck out from the open crotch of his pants. Then her eyes flicked back to the horny couple in the bedroom.
The young girl, Becky was sure that she was even younger than she was herself, was down on her elbows with the man still giving it to her from behind. Her back was arched sharply and her naked ass quivered each time she took all of his prick-meat. Sometimes her face was pressed down against her arms and sometimes she tossed it back, rolling it around on her shoulders when she particularly liked the way the older man fucked her.
The man wore an expression of dominance and ecstasy. He gripped the girl around the waist, his fingers nearly reaching all the way around her. As he fucked into her with all his strength, he also pulled her toward him, making sure she got all the cock-meat there was to be had. From time to time he held her ass pressed against the base of his prick and rolled his hips from side to side, wiggling his prick around in the depths of the girl's speared cunt-channel.
"Incredible," Becky sighed, her fingers automatically running up and down the length of her brother's cock. "In-fuckin'-credible."
Tom gave another dirty laugh and then jabbed his sister's cunt with two fingers. Her pussy gripped his fingers very tightly. When he pulled them out, they were slick with her juices, and he smeared those juices across the exposed point of her thrusting clit.
Becky gasped and gave his prick a squeeze of appreciation. She was still very turned on by watching other people fucking, but as she got more used to the idea, found it easier to do two things at once, namely watching them and jerking her brother off.
She rubbed the pearl of pre-cum that she knew without even looking was at the tip of his cock around his straining prick-tip and listened with satisfaction as he sighed in pleasure. Then she gripped his cock tightly and worked the loose outer skin back and up over the solid inner core, feeling her crouching brother wriggling with mounting fuck-lust.
"That feels great," he panted. "Do you like what I'm doing to your pussy?"
"Y-yess," Becky sighed, thrusting her pelvis out and opening her cunt up. "Fuck me!"
Becky spoke through gritted teeth, and Tom did as she asked. He pushed his fucking fingers deep inside of her and then opened them up like a pair of scissors, forcing them against the walls of her pussy.
"Oooh," she gasped, feeling as if he was stretching the shape of her cunt-hole.
In retaliation she took her hand away from his cock long enough to coat it with a pearly layer of spit. Then, her eyes still on the fucking couple, she smeared the tip of his prick with her wetness and proceeded to smooth the lubricant all down the sides of his prick.