Sammy looked up from where she was sitting in the sand-pit, putting the finishing touches to her magnificent sand castle.

"Not yet, Mike," the nine year old begged plaintively. "I haven't finished my castle."

"Yeah, well it's okay for you," said her older brother, "but I'm bored."

"Can't we stay till I finish my castle? complained the little girl. "You could play on the swings while you wait for me."

Mike sighed heavily. His little sister still believed that because he played with her, he must be enjoying their games. The truth was, the only games that he enjoyed with the little girl were the ones that gave him an excuse to see her panties or, if he was really lucky, he might occasionally catch a glimpse of what was underneath them.

"Swings are for kids," said Mike impatiently. "I'm a bit old for that sort of thing."

Sammy pouted at him. "I'm not a kid," she said, "and I like the swings."

"Of course you're a kid. Nine years old is still a kid."

Sammy patted one of the turrets gently, the tip of her tiny pink tongue stuck firmly between her lips as she concentrated on the job.

"I can't be a kid," she said finally, with a note of triumph as she stuck a small paper flag in the topmost turret. "I've got boobs now."

The matter-of-fact way that she said it indicated that the little girl did not attach too much importance to her newly forming breasts but her older brother had not only noticed the tiny swellings, that had seemed to appear almost overnight, he was burning with curiosity about them.

"A couple of little pimples on your chest doesn't make you a grown-up," he said, teasing his sister. "Like a couple of hairs around your willy doesn't make you a man?" queried the little girl with, what appeared to be, wide eyed innocence.

Mike looked away to hide his embarrassment. It was one thing for him to be curious about his little sister but he was not prepared to discuss his own body with a kid who was four years younger than he was. "Anyway," he said defensively, "you shouldn't go talking to people about your boobs."

Sammy sighed and stood slowly. "You aren't people - you're my brother."

Innocently oblivious to her brother's attentive stare, she flipped up her short skirt and brushed the loose sand from the seat of her white panties.

"You want some help with that?" asked Mike, half seriously.

Sammy giggled and shook her head, blonde hair flying around her pretty face.

"Nobody is supposed to touch me there, mummy said so," she said primly.

Her serene expression betrayed nothing of the tiny thrill of excitement, that rippled through her tummy, at the thought of her brother brushing sand from her bottom. The strange new sensation puzzled her but it felt nice in an odd sort of way.

"I'm not nobody - I'm your brother, remember?"

Sammy grinned ruefully. "Okay, so you're my brother, but just the same..."

"I don't want to touch you there," Mike shrugged, trying to hide his disappointment. "I just offered to help, that's all."

He hadn't really expected his little sister to take him up on the offer but her blunt rejection shattered the fantasy he had been building in his mind.

"All done now, anyway," giggled his sister. "See?"

She wiggled her bum at her brother in innocent provocation as her small hands gave one final brush to her panty covered bottom.

"So what d'you think of it?" she said provocatively.

"What makes you imagine that I think anything about your bum?"

"I meant my sandcastle, silly," she said with a toss of her head. "Why would I care what you think about my bum?"

"It's fine - very nice," muttered her brother, knowing that his sister was teasing him and slightly annoyed that she had succeeded.

He was well aware that the innocent little girl deliberately exposed herself to him at every opportunity but he could not work out why. He wasn't about to complain though - he enjoyed the occasional glimpses of her little girl's body. He just wished that it was more than a fleeting glimpse. Essentially, Sammy was every bit as innocent as she appeared, except that she had somehow worked out that her brother liked to study her little body. The flashing glimpses that she gave him were nothing more than a game to her - a game that some hidden instinct told her she should not be playing, which somehow made it even more exciting......(cont)