Samuel and Samantha were born fraternal twins, about 15 minutes apart. Both often got tired of explaining why they didn't look alike. Their parents had thought it cute to give them similar names.
Samantha was born first by about ten minutes and by her eighteenth birthday she had grown into a pretty, willowy blonde girl with light blue eyes. Her twin, Sam, was half a foot taller at six feet and had a slim, long-distance runner's physique. His hair took after his father, being a light brown and he had hazel eyes.
In family pictures you might have thought the pictures of Sam and Samantha were early life pictures of their parents. Sam took after his dad in more than looks, he was into sports, swimming in particular. He held his school record for both the 100 meter butterfly and crawl. Samantha on the other hand was nothing like her mother. She was more tomboy and as they grew up she was always challenging her twin in some way or another. She could swim almost as well as her brother but though Sam coaxed her to join the girl's team at school she just wasn't into team sports.
She did go out for the diving team, her willowy body in the skin-tight diving suit was perfect for clean rips and she had talent but she quit the team after only a month. When Sam asked her why she said the coach kept touching her in ways she didn't like. Ways only her twin was allowed!
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Samantha rolled on her side and grabbed her twin's manhood. Sam growled.
"Jeez, Sammy. Give it a rest." He gave her an appealing look.
"Its been almost an hour, Sam." She pouted prettily.
He sighed. His twin was a nymphomaniac, he was certain!
"Aren't you supposed to be meeting Kelly at the mall? I thought you two were going to shop today."
Samantha sat up on his bed and giggled.
"She called me early yesterday and said she had to go with her parents to visit her uncle's ranch." She grinned. "You've got me all to yourself for the weekend."
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Their parents had brought them up close, being twins, and even dressed them alike during their early years. This was facilitated by Samantha's tomboy personality, she'd rarely worn a dress or skirt until she was in junior high and the school had uniform requirements.
So the twins grew up with a very close brother/sister relationship. Far closer than their parents would have liked had they known. The twins played the usual sex games as they entered puberty. Samantha, first to feel the tug of puberty, was the one to initiate the time-honored game of "show me yours and I'll show you mine". Sam was a willing participant but it wasn't until a year later, when his own pubescent hormones hit, that he actually showed a real interest in his twin's nubile body.
Once that happened they began to play more seriously.
♡♡♡
Sam rose and headed for the bathroom for a shower. His twin joined him but he ignored her playful hands as he quickly washed and slipped into his swimsuit to head outside to the backyard pool.
Samantha pouted at him but he just grinned and blew her a kiss. "Patience, Sammy."
♡♡♡
Once hormones had kicked in for both of them there was no turning back. As usual, Samantha was the aggressor. She was soon giving her twin hand-jobs and showing him how she liked to masturbate. They discussed incest in very frank terms and both agreed that what they did in private was no one else's business. Their mutual masturbations and heavy petting soon grew into oral sex. For some years Samantha liked to sneak into Sam's bedroom at night and they would satisfy their young lust together. Soon Sam was pushing his twin to go further still.
Samantha might have been more aggressive than her twin but she wasn't unthinking. She'd had all the "feminine hygiene" classes and understood about sex and pregnancy. She refused and told him why but promised.
"When we graduate from high school and I'm on contraceptives I'll let you fuck me."
He did talk her into trying anal sex.
"You can't get pregers doing that any more than swallowing cum, Sammy."
Samantha had bee hesitant but Sam took it slow, using a finger for a long time to get her used the the feel of something back there before he first entered her with his cock. Like the rest of his body, his manhood was slim and only a bit longer than average at six and an half inches, Samantha had enjoyed keeping a record of its size as they both matured sexually just as Sam liked to keep track of the soft swellings on his twin's chest. He was circumcised and a little over an inch thick. It made for a mostly painless first experience for his twin which he was grateful for and after a while became almost completely painless. Samantha grew to enjoy the feel of her brother's slim cock deep in her ass. It became a semi-regular part of their sexual relationship.
♡♡♡
Sam dove into the deep end of the pool and hugged the bottom as he stroked the length to the shallow end. As he rose he sighed with delight. It was going to be another hot day and they would probably spend most of it right here in the pool and relaxing on the patio in the shade a large old maple tree that cast a convenient shadow over the back of the house.
He heard Sammy call and looked toward the house. She waved from the patio and his eyes widened in delight. She was naked!
He chuckled to himself. With their parents gone for a long weekend visiting relatives out of state they had the house to themselves. Add to that their nearest neighbor being a quarter-mile away and the tall, solid wood fence that enclosed the whole backyard there was no reason to worry about being spied on.
He climbed out and walked toward her. Samantha pursed her lips at the sight of his swimsuit. Sam just shook his head as he skinned out of it and dropped it on the flagstones near the table.
"Should have known you'd go nudist the first chance you got." He laughed.
Samantha sat down and pointed at his penis, withered by the cool water of the pool.
"Hello, Mr. Stubby." She giggled.
Sam snorted and sat down beside her and reached for the tall glass of ice-tea his twin had brought out for each of them.
"It won't stay that way long with you running around all sexy nude like that." He grinned, letting his eyes linger on the small but perfectly shaped tits he loved to kiss and fondle.
"Good." She laughed. "I've got big plans for it this weekend."
"Oh yeah?" He looked at her closely. "Want to clue me in?"
"You'll find out in time." She gave him her coy look.
Sam grinned. "Does it include your pretty round ass?"
"Jeez, Sam. Give it a rest." She giggled, quoting him from earlier. "You already stretched my poor butt-hole this morning. Its still tingling."
Sam shrugged. "I'm just curious. You're devious."
"No hints." She ignored his remark.
They sat for a time, gossiping about the graduation dance just passed and friends from school, relaxing and sipping their drinks.
"So what did you and Joe do after the dance." Sam asked his twin casually.
"We fucked like rabbits for over an hour." She said and watched her twin's eyes widen in shock before adding. "NOT! God, Bro. You're so easy to tease."
Sam shook his head ruefully.
"Actually, I let him play with my boobs and gave him a hand-job just to be fair."
