It also had something to do with the way Kristy was dressed. His sister was wearing the shortest skirt he'd ever seen on a girl. It was so short it barely covered her hips and behind and, each time she moved, it swirled and twirled up, sometimes revealing flashing glimpses of the red panties she appeared to be wearing underneath. Eric didn't think his sister was wearing a bra, either — he couldn't remember seeing her nipples so clearly before, not even when he'd seen her wearing just a bra.
The thirteen-year-old boy sat at the kitchen table and watched his sister move around the kitchen, his cock rock hard inside his jeans and dirty thoughts swirling in his head. During the past year or so, every time Uncle Ted came to visit, the man always brought his young nephew a secret gift: magazines with pictures of naked young girls, some who looked as young as he, and books with stories about sex, usually involving teenagers. Often, the books had stories about incest between brothers and sisters or other family members.
The young boy's favorite scene in the most recent book had to do with a teenage brother and his nubile little sister kneeling on the floor of the hallway and peaking through the crack in the doorway of a bedroom as they watched their mother getting fucked by a neighbor. As the two kids watched the torrid sex scene, the brother reaches up under his sister's skirt and pulls her panties down. Then, the boy unzips his jeans and runs his cock up and down through the tight crack of his little sister's ass from behind. The young girl really loves it, and the brother ends up fucking her in the ass as they watch their mother getting fucked from behind, too.
Whenever Eric read the dirty books and looked at the sexy magazines he would masturbate, giving himself some great orgasms. As he became more and more aroused from the stories and the pictures, he would undo his jeans and slip them off along with his underwear. Naked from the waist down, the little boy would then sit on his pillow on the edge of his bed, press the sides together, and run his hard little cock up and down through the tight crease in the pillow as he looked at the pictures and fantasized about the girls, finally making himself shoot off. The first time he did this he creamed all over the pillow case. But, he soon figured out how to have a tissue or piece of toilet paper nearby so he had something to cum into and not make such a mess.
Since he and his sister shared a bedroom, it was difficult for the thirteen-year-old boy to find private moments to get himself off, though lately he usually managed to masturbate at least once a day.
For the past couple of months, as he humped his prick though the wonderful soft-tightness of the pillow between his legs picturing himself having sex with the young girls he read about, his sister became the one he was doing sex things with and lovely, dirty thoughts of fucking her filled his head and made his cock hard almost all of the time.
For a while, now, Eric had been watching her more closely as she changed clothes in the bedroom with him there, admiring the way her breasts filled out her bra and, in his mind, comparing her body to the pictures of naked young girls he saw in the magazines. He especially liked to look at that special secret place between her legs as she walked around the room in the small bikini panties she liked to wear, his eyes secretly glued to her crotch and his cock hard and throbbing. Sometimes, as he lay in bed watching her get dressed in the morning, he would slip his hand down inside his underwear and stroke his swollen sex shaft. That felt especially good.
The young boy was getting more bold, too. He wasn't at all shy or embarrassed about his sister seeing his erect member pushing out the front of his white cotton underwear briefs, or the small spots of wetness the fluid of his excitement created on the front of his underwear. In fact, he secretly liked the idea of a girl seeing him so hard and horny, even if it was his big sister, and these thoughts made his cock twitch deliciously. Lately, whenever his mother wasn't home and it was just the two of them at home, he walked around the house just wearing his underwear briefs, purposely letting his sister see his thirteen-year-old cock creating a long, hard bulge in the front.
These thoughts were swarming in his brain as they finished their supper and Kristy walked around the kitchen cleaning up, her short skirt flipping and flying with each sharp movement of her slender hips. Eric saw the sly smiles being exchanged between the fifteen-year-old girl and Uncle Ted, but the boy still wasn't completely certain what it all meant.
After supper, Ted suggested that they watch a movie in the living room.
He went to his suitcase and came back with a video, saying it was a special movie that he thought his niece and nephew would really enjoy.
Kristy turned the lights off and darkened the room as the man put the video in the VCR and turned the TV on. They all settled on the couch — Ted at one end, Eric at the other, and Kristy in the middle between them sitting with one foot on the floor and the other curled under her. Eric furtively glanced down at his sister's crotch as she sat beside him, hoping to catch a glimpse of the area between her legs as the short skirt rode high up on her thighs. But, the hem still cover her there, though just barely.
Without any fancy opening or credits or anything, and with only a little bit of sound, the video immediately began with the far-away view of a large living room and what seemed to be about a dozen or so naked people sitting on chairs or laying around on the floor. As the camera view got closer and more focused, it was obvious that the naked people were all young teenage kids engaged in various sex acts with each other.
The camera immediately zoomed in on one very slender, blond-haired girl with small, pointed, child-like breasts as she knelt on the floor enthusiastically sucking a young boy's cock. Both of the youngsters were naked. The young boy sat on the edge of a large, over-stuffed chair, his skinny, hairless legs wide apart as the girl knelt between them, and he softly petted her head and murmured things that you couldn't quite hear.
With a jerky motion the camera moved to the side and got closer, focusing in on the side of the young girl's face. She held the boy's cock upright with both of her hands as her head slowly bobbed up and down, taking his shaft almost completely into her mouth. You could even see her sunken cheeks as she slowly pulled and sucked at the small, pale shaft with her tightened lips. Then, she used her hand to gently stroke up and down the boy's slender, slippery prick. Neither of the kids could have been more than thirteen or fourteen-years-old, but the girl certainly seemed to be experienced and completely at ease with what she was doing.
After a moment the angle widened, turned a bit and, right beside them, a somewhat chubby, homely-looking girl with very short, curly brown hair was on her hands and knees getting frantically fucked from behind by another young boy who seemed much short and smaller than her. The girl had large, soft breasts with long nipples that hung down and wobbled each time the boy's nearly hairless loins collided with her wide, pale ass as their bodies slapped frantically together.
At first, the boy held onto the chubby girl's hips as he pummeled her butt with his thin cock. Then, he paused a moment, leaned over her back and grabbed her large breasts in his hands, squeezing them in his fingers as he pumped quickly into her again.
The scene soon widened some more, and the camera began to pan slowly around the room, taking in more sex action by teenage couples and even groups of three or four young kids.
One girl seemed a little bit older than most of the other kids, maybe sixteen or seventeen. She had very long, thick, dark brown hair and large, full, very pointed breasts tipped with long, hard nipples. The naked girl knelt on the floor and straddled a boy's lap as he lay on his back. Slowly, she moved up and down over his loins as his cock slid in and out of her from below. At first the camera was focused down at her behind and you could see the boy's prick moving completely in and out of her. But soon the camera moved up her body and around to the side of her face and you could see she had her head turned to the side, her hand holding another boy's cock at the base as he stood naked beside her. The girl eagerly pulled at the long, slender sex shaft with her mouth, her large nipples long, hard, and erect as her breasts wobbled and bounced with her up and down motion on the other boy's cock.