She opened the sliding door as quietly as possible, closed it behind her, and eased through the shadows. Karen was determined to surprise him. She didn't want to take a chance that he'd see her and make her go back into the house. No, he wouldn't see her until she was in the pool with him. He wouldn't see her until she suddenly was right there beside him.
She tossed her robe into a chair as she eased toward the water. She watched the powerful strokes of her brother's arms, remaining in the shadows until he made a turn and began moving away from her. Then she stepped quickly across the apron of the pool and eased over the side, into the water. She suppressed the thrill that the cool water sent through her body. She tingled, loving the crisp exhilaration her naked body experienced. Brad was making his turn at the far end of the pool. Karen took a deep breath and ducked beneath the surface. She gauged his direction and speed, swimming underwater toward him.
Then he was suddenly against her. She grabbed him, playfully drawing him down with her. The touch of his skin thrilled her. The knowledge that he was as naked as she added to the thrill. She wrestled with him as he overcame the first moment of surprise. His hands grabbed at her lush body. He caught a tit in one hand and pulled at it playfully. His fingers rubbed across her nipple, sending delicious tremors through the heaving globe. Karen thrust the breast anxiously against him, then broke free of his grasp. She needed a breath of air and didn't want him to recognize her, not yet. She wasn't sure whom he thought it was in the pool with her, but she didn't want him to realize that it was his kid sister. Hell no!
She was lucky. Karen saw his head out of the water when he came up for air. He was looking in the other direction, though. He was searching the dark pool for her while taking great gulps of air himself. She drew in a long breath and ducked back under the water. She swam toward him and grabbed him again. This time she got her hand on his cock. She came up from behind him and reached around. She ran her hand up his thigh until she got hold of his meat.
She could hardly believe it. Brad had a hard-on! She had expected to grab a soft pecker. Instead she felt a huge, stone hard cock. She held it tightly, rubbing her tits against his back while he fought to turn and face her. They thrashed in the water as he turned. His face plunged into her tits as she changed hands, grasping that wonderful piece of hard meat with the other as he turned toward her. His mouth sucked on her tits. His tongue lapped at a nipple. His hands roved along her body, driving the blonde into a frenzy of delight.
He took a quick gasp of air again and returned to her tits. By now he had his cock against her legs, pumping it toward her like he wanted to stick it into her pussy. Karen managed to get her head out of the water and draw another saving gasp of fresh oxygen. Then she felt his cock hitting against her clit. Brad was hunching that monster up at her like he was determined to get it into her. It was the most fabulous experience Karen had ever had. She relaxed in his arms, hoping he could manage it before he recognized her. Wouldn't that be something? Wouldn't it be hilarious if Brad actually fucked her before he knew it was her?
It didn't work that way, though. His head came up from her tits. He was laughing as he looked at her. He was laughing one moment and frowning with shock the next. Karen was about to duck her head under the water again. Brad grabbed her by the hair, though. He pulled her up and stared at her. His eyes were glittering even in the moonlit pool.
"Karen!" he gasped. "What the hell are you doing out here? I thought you were Anne!"
The blonde was about to plead with him when she realized what he had said. It would have been all right if she had been Anne! He had been trying to get his cock in her because he thought it was her older sister! She felt a moment of anger, then realized that she might be able to use this slip of his tongue.
"You'd have fucked Anne!" she accused. "You were all set for a good screw, weren't you? Your cock was all big and hard. You were trying your best to stick it in me. You thought I was Anne. You've been screwing Anne, haven't you? You and Anne have been fucking together all summer!"
"That's none of your business!" he snapped at her. "What Anne and I do doesn't concern you. Now, you get out of this pool and get your clothes back on!"
"Sure," she answered him, bouncing about in the water. "Soon as you finish what you started."
"The hell I will!" he gasped. "I didn't start a damn thing. Get out of here, Karen. Get out of here now!"
"What's the matter?" she taunted. "Did you discover that I'm not so young, after all? That was a grown woman's tit you had in your hand, wasn't it? My pussy has hair on it now, Brad. I'm fifteen. I'm older than Anne was when she started. I'm older than you were, too, I bet! I just bet you that you've fucked girls younger than me."
Her brother tried to turn away from her. He pulled back from their embrace despite her clinging to him. Something about the tension in his body told her that she was right. Something about his actions also told her that he'd liked the tit that had been in his hand, had enjoyed the ripe breasts that he'd been kissing so fervently.
"You want to!" she accused. "You've got a hard-on still! You want to fuck me as bad as I want to be fucked!"
Brad swam away from her. He swam to the edge of the pool and climbed out. He was still hard. In the moonlight she could see it. His cock was hard and throbbing. She got out of the pool and caught him before he could go in the sliding door. She pulled him into the shadows, toward a waiting chaise lounge. The luscious young blond rubbed her maddening body against him, her lips pleading with him.
"Anne says that I'm not too young," she told him. "I'm old enough to cunt suck with her! Didn't she tell you about that?"
"No!" he gasped in surprise. His moment's pause was his undoing. In that pause he looked down at the lovely young blonde. His cock pulsed eagerly as he saw those gorgeous tits and remembered how they had felt beneath his lips. He could see the deep shadow of her crotch and imagine how sweet it would be…
"Mmmmmm," Karen sighed as he eased her down onto the chaise. "Ohhhh, yesss!"
He slipped down beside her. Brad reached for her tits. He cupped one of her lovely breasts, amazed at how full and round it was. It was firm and hard, yet soft and light at the same time. Damn, it was beautiful! He ran his fingers sensuously around it, tracing its shape. He cupped it again from the side, then from beneath. He caught it in his hand and rolled it about. He teased at the nipple as she moaned softly in her growing delight.
"You are a big girl," he muttered hoarsely. "You're a damn big girl. At least, you've got the tits of a big girl."
"I've been trying to tell you that," Karen murmured softly. "I've been trying all summer."
She had gotten her hand back on his cock and was tracing its great curving sweep with her fingers. Her fingertips examined the delicious size of his head, then ran along his pulsing shaft in amazement. God, he had a beautiful cock! This was even more exciting than she'd dreamed a cock would be. She caressed it more firmly, closing her fingers around the hard meat and feeling the powerful throbs that shook it.
"There's a lot of summer left," her brother reminded her. "We get you into action with Anne and me, and we'll really have a great vacation."
"You sure changed awful fast," she teased him. "Five minutes ago, you wouldn't have touched me. Now you're looking forward to a summer of fucking."