It is fair to say that in many ways Gary and Jan were the quintessential Aussie kids.
Born just a year apart, they were the eldest two of four children, growing up in a typical Aussie family, in a beachside town north of Sydney. Gary was 19 but still living at home, and Jan had just turned 18.
Their Mum and Dad, like almost all the parents in the region, both worked... their dad at a nearby steelworks, and their mum as a freelance book-keeper for a number of small businesses in the town.
All the Anderson kids did OK at school, they had the usual complement of friends, and they shared the almost universal Australian love of the beach.
Perhaps the only unusual factor in their lives was the closeness that the kids felt for each other...and particularly the closeness between Gary and Jan.
While most of their friends seemed to merely tolerate their siblings, Gary and Jan genuinely liked each other's company...and often seemed like great friends, rather than brother-and-sister.
Perhaps it was that closeness. Perhaps it was their shared love of the beach, and of sunbathing. Perhaps it was that each had, unbeknownst to each other, discovered the joys of porn via the internet. Perhaps it was the phase of the moon? Who knows?
But whatever the cause, some spark was struck that hot January day, a spark that ignited a lust that neither of them knew they had.
It had begun like any other summer's day. The kids had been on holidays since the week before Christmas, and weren't due back at school until the last week of January, still a fortnight away.
The summer had been typical: long, hot, languid days with clean clear azure skies and just enough breeze blowing in from the ocean to make this temperate climate the best of all possible worlds.
The Anderson kids, like most Australian youngsters, had spent the majority of the summer within a bushman's Cooee! calling distance of the water-either the beach or the local public swimming pool was where you would find them most days.
But today would see a change in that pattern. Sandra, the third of the Anderson children, was due to start High School when the term resumed in two weeks. That mean a new school uniform, new books, a new bag...and THAT meant a trip to nearby Newcastle.
Along with the daughter, Mrs. Anderson decided to take Billy, the youngest of her brood, on the shopping expedition, as he was growing out of all his clothes so fast, they too would need replacing before school resumed.
For Gary and Jan this was a bonus...it meant they needn't be tied down looking after their siblings and could spend the day lounging about in the sun without interruption.
"So...you going down the beach today?" Jan asked her brother as they finished their breakfast cereal.
"Well, I thought I might go over to Banana Bay instead," Gary replied, referring to a small beach in a national park just south of the town. "Wanna ride over there with me?"
"Why not," Jan responded. "I'm getting bored with the same old people down at the surf club. Hey...we could make lunch, and take it, and spend the whole day there if you like!"
"Kewl," Gary exclaimed. "I'll go get the bikes ready, while you make us some sandwiches, eh?"
Half an hour later, and the two were laying down their bicycles, having ridden along the bush track leading to the secluded beach that got its nickname from the copse of fruit trees growing just back from the small stretch of sand.
"Jeeze, Louise, what did you put in that backpack?" Gary asked, as he slung the bag containing their lunch on the sand. "It feels like it weighs a tonne!"
"Oh, just a few sandwiches, some fruit...oh, I know what was so heavy...I put in a couple of two-litre bottles of water in case we get thirsty" Jan replied.
"Thirsty?" Gary snorted good-naturedly. "I'm sweating like a pig already after that ride, and carrying that backpack. I'm gonna strip off my shirt".
With that, he tore away his T-shirt, showing a deeply tanned torso that reflected a childhood spent in the sun.
"Not fair," Jan laughed. "You guys can just rip your top off anywhere. Us girls have gotta keep some parts of us covered up no matter how hot and sweaty we get."
"Oh, I dunno," Jim replied half-jokingly. "There's only the two of us here...and I'm not gonna complain if you want to get comfortable."
Jan looked quizzically at her brother for a moment, seeming to weigh something up in her mind. Then she smiled, as she came to a decision.
"OK then, smartypants...want to go skinny dipping?" she challenged.
Gary looked at his sister, gauging whether she was joking or serious. He saw a half-smile play across her lips and thought she was in jest, so said "OK...I'm game."
But the he had misread her expression... something he realized as his sister first lifted off her t-shirt... and then reached behind and undid the straps on her bikini top.
Within moments, and before his startled eyes, Gary was treated to the vision of a succulent, near-perfect pair of globes on his sister's chest, with their tan-lines cutting diagonally just above the small brown nipples, were exposed to a man's view for the first time.
"Oh wow," he breathed, as he drank in the sight.
But before he could comment any further, Gary watched in amazement as his sister reached down and slid both her shorts, and her bikini bottom, to the sand, to stand there, arms akimbo on her hips, her splayed fingers pointing to the soft downy hair covering her mound.
It was as if she were saying to her brother "well, what do you think?"
What he thought was that he had never seen anyone as downright sexy as the vision that was suddenly before him.
The sheer grace and symmetry of his sister was startling.
Her hair was burnished red, and surrounded her face like a teak photo-frame before falling, gently, to her shoulders.
Her neat brown eyes had flecks of green in them, as she challenged her brother with a look, and her slightly upturned nose and high smooth cheeks were dusted with a light coating of freckles, like cinnamon sprinkled on apple.
Her breasts were pert and somewhat conical, with a chocolate brown aureole covering a full quarter of their ripening globes, and they held a promise to her future babes-or men-that would later suckle from their succulence.
Gary's eyes were drawn down, across her lithe and tanned stomach to the reddy-brown patch of fur that both covered her womanhood, and announced it to the world.
All this crossed Gary's mind in an instant or two, and he was still gathering his thoughts when Jan raised an eyebrow and said "Well?" Are you going to join me?"