Caroline started it. They were sitting after breakfast, after their mom had gone off to work. School was out and Carl and Caroline were home for the summer break. Caroline was reading the local paper, reading out snippets of news to Carl, trying to make him laugh, because Carl was on a low. His girlfriend Rhonda had gone home and it would be a month before he saw her again. After the intimacy they had shared, Carl was feeling lonely. And horny.
“Hey, Carl. Listen to this!”
There was a strange tone in Caroline’s voice. “Listen to what?” said Carl.
“This. ‘Fun, people! July 14th is National Nude Day! Get those clothes off now!’.”
“So?” said Carl, then, “Oh. That’s today.”
“Yeah, it is,” said Caroline, a strange note in her voice. Carl looked at her, really looked at her. His twin sister was good-looking, sure, with the same tawny-blonde hair as himself, except on her it looked good. But from the sound of her voice it seemed that his usually shy sister was thinking of going naked. Maybe she was, she seemed a lot more open after being away at college.
“Where?” said Carl. It always half amused, half frightened him that sometimes he and Caroline seemed to have the telepathy thing going, and somehow he knew Caroline was going to do this.
“Dover Point,” said Caroline. “It’s a nude beach now. They’re doing a special for National Nude Day, free admission to couples and family groups.”
“Whoa,” said Carl. “Not me.”
“I’m a girl, you’re a boy. That makes us a couple,” said Caroline. She grinned at her brother. “Don’t tell me you’ve given up trying to catch me naked?”
Carl flushed. Caroline was right, he admitted to himself. He had tried to take a peek – no, truth, several peeks – at her, but somehow she always knew if he was around.
“Well?” demanded Caroline.
“Okay, I admit it,” said Carl. “I have tried, but you’re a hell of a looker, sis, so you can’t blame me.”
“I don’t,” Caroline said softly. “I’ve tried to catch you a few times, too.”
Carl blinked, surprised. “Sis,” he said softly, “I don’t think I’ve got the nerve to do it in public.”
Caroline made a face. “Me either, truth be known.” She brightened. “Why not here?”
“Here? You mean, in the house?”
“No, stupid, in the back yard. Look, we have that lovely pool out there. I think only one corner can be seen from outside, and we could move your van to block that. The rest of the back yard is screened because of the trees and the slope. We could go naked, no sweat.”
Carl looked at his sister, beautiful, animated. He knew already he was going to agree, yet he hesitated. “What if someone comes?”
Caroline laughed. “Who? Our friends are away. Mom’s at work.” She shrugged. “Take a chance, bro.” She fixed him with a look. “You want to see me naked? Fine, but I have to see you naked, too. A special offer which might never be repeated, to celebrate National Nude Day.”
Carl stared at her. “Okay,” he said slowly. “It’s a deal.”
“Great,” said Caroline, throwing the newspaper down and springing lithely to her feet. She opened her robe to reveal her bikini. “I’ll go and dump this in my room. See you in the pool.” She grinned. “Don’t forget to move the van!”
“Sure thing,” said Carl absently as she left the room, the vision of his sister’s slender, bikini-clad, soon to be unclad, body vivid in his mind. His prick twitched and he grimaced. That could be awkward, if it acted up at seeing Caroline naked. Think icy thoughts, Carl, he told himself, icy thoughts.
A few minutes later, as he started his van and moved it forward to block any view of the pool from the road, or indeed from the driveway, Carl was startled to see his sister’s slender loveliness flash across his vision as she ran lightly forward and made a neat dive into the pool. ‘She was serious’, he thought, the vision lingering, her high, taut breasts vivid in his mind’s eye. He swallowed, parked the van and made his way thoughtfully into his bedroom. Moments later, naked under his robe, he went out to the pool.
Caroline, who had been on their high school swim team, was doing fast laps of the pool and Carl just watched her for a moment, enjoying the display of athletic grace. As she turned Caroline caught sight of him and slowed, letting her feet find bottom, just her head showing. Carl couldn’t make out any detail of her form because of the disturbed water, but the glimpse he had caught came back to his mind.
“Come on, Carl, the water’s lovely.” He hesitated, and Caroline laughed. “Come on, the water feels great when you’re naked. If you’re shy, I’ll turn my back while you get in.”
“No, it’s okay.” He untied his robe, his back to Caroline, praying that his prick would stay down. He threw the robe onto a sun lounger and turned back to the pool. Unheard by him, Caroline had swum closer and was standing just six feet away, the water level now below her breasts. They stared at each other.
Carl let his eyes roam over Caroline’s upper beauty. Her hair, short, was plastered to her skull; her nipples were erect, eraser-tip size, on inch-across areolae, her breasts firm; not large, but standing proudly from her chest. In her turn Caroline saw her brother as she had never seen him before, as a stud male. A good-looking one, too, she thought. Carl’s prick, despite his willing it not to, was half-erect and Caroline felt a twinge in her pussy.
Shit, she thought, I bet that would feel good. It’s as big as, or even bigger than Jimmy’s, and that feels good. She shook herself mentally. It’s not going to happen. Pity. Aloud she said, with a grin, “Nice prick, bro. Come on, I’ll race you. Ten laps. Loser acts slave for the other. Deal?”
“Slave?” said Carl. “To what extent?” He grinned. “Incidentally, sis, nice tits.” Very, very nice.
“Thanks,” said Caroline. “To what extent? How about, for an hour, the loser does exactly what the winner asks, no arguing? You could manage an hour, surely?”
“Anything?”
“Um, yes. Anything.”
Carl grinned. “I bet I’m still faster than you.”
Caroline grinned right back at him. “Have you been swimming every day at college?”
“Not every day, no.”
“I have.” Caroline held up her hand. “Pull me out. We’ll start on a dive.”
Carl held out his hand and hauled his sister from the pool. His eyes dropped to her groin despite his efforts not to look. Caroline had trimmed her pussy hair to a small tuft on her mons. As far as Carl could see, she had shaved her pussy clean, otherwise. His eyes caught hers and she gave a knowing grin.
“Yes, bro, cleared for action.” She turned and poised herself ready at the pool’s edge. “Ready?”
Carl moved up alongside her, trying to decipher her cryptic phrase. “You call it, sis,” he said.
Caroline dropped into a racing crouch. “After three. One, two, three, go!”