"Shove it in and out!" he instructed her, his ass hopping up and down on the rock, pinning her wrist down at an uncomfortable angle each time he slapped down. She pressed repeatedly against his prostate and he moaned, unable to keep still.
"Fucking good!" he squealed. "Do it! Do it! DO IT!"
He came like a river in her mouth. She started to choke, much of his jism oozing down the corners of her mouth. Still, she managed to swallow a lot of it and what she tasted was definitely to her liking. In fact, she preferred his gism to Kathy's more watery cunt fluid.
Tommy frantically squeezed Margaret's tits as he ejaculated into her mouth, filling it with his thick, stringy essence. Margaret sucked and swallowed. She couldn't get enough of his bubbly cream.
When she finished milking him dry his cock was limp. He felt thoroughly drained. Drained but satisfied.
"Tommy! Margaret! You two down there?"
Without thinking, they leapt to their feet. His heart pounding, Tommy managed a weak smile. "It's okay," he said to Margaret, who was visibly trembling. "It's only Kathy."
"Do you want to dress? Is it okay if she sees you naked?"
Tommy giggled. "Yeah, it's okay. It won't be the first time."
Kathy climbed down the rocks, smiling when she saw her brother and best friend standing on the flat rock.
"Well, well, what have you two been up to?"
"I've been teaching Margaret tick-tack-toe," Tommy said.
"Oh, I bet you have. I thought you both might be interested to know Mom and Dad went into town just now for lunch and a movie. I guess – they needed a break in the routine. That means the house will be empty for the afternoon."
"Great!" Tommy exclaimed. "We can have an orgy!"
Margaret looked at Kathy. "The three of us? Together?"
Kathy shrugged. "Why not?"
"You two seem awfully casual about fucking all of a sudden. Is there something you haven't told me?"
"Should we tell her?" Kathy asked Tommy.
Tommy shrugged. "Why not?" He turned to face Margaret. "Kathy and I have already fucked."
Margaret couldn't believe what she had just heard. She looked dumbly at Kathy, then at Margaret.
"I was going to tell you," Kathy said, putting her hand on Margaret's shoulder and squeezing gently. "It happened just before you arrived. I guess Tommy and I have always felt that way about each other, but were afraid to do anything about it. It's like you and I. Think of all the pleasure we could have enjoyed before that first night at your house."
"It's-it's just a shock, that's all. I mean you are brother and sister…"
"I know, I know. I can understand. But it's more than just being brother and sister. We want to have more than that kind of innocent relationship with each other. We're certainly not the first to do it. Just because society today doesn't look at that sort of thing too kindly doesn't mean it's automatically wrong."
"I-I guess you're right. I mean, we're all good friends. More than just good friends, so why not really enjoy each other?"
"Exactly!" Tommy piped in. "But I suppose we could have been more subtle letting you know about it. I'm as much to blame for it as Kathy. Sorry."
Margaret smiled. "Forget, it. It's just as well everything is out in the open. Let's get dressed and have a little fun!"
Margaret and Tommy quickly got back into their bathing suits and the three of them scampered back up the rocks and raced down the beach to the house. Tommy led them and he was careful to go around Edna's house, by the sand dunes, so they wouldn't be seen. There would be time for Edna later.
They went in through the kitchen. The house seemed eerily quiet.
"It's nice not to hear those typewriters clicking away," Tommy remarked as they all mounted the stairs, two steps at a time.
"Whose room shall it be?" Kathy said. "In whose room shall this great event take place?"
"The guest room has the biggest bed," Tommy said. "Why don't we go there. Besides, Margaret will feel right at home!"
Once inside Margaret's room, the door closed and locked behind them, the two girls looked at each other and smiled.
"What's going on?" Tommy asked, seeing their mischievous smiles.
Both girls advanced toward him, pushing him back on the bed. He started to giggle. "What's going on!" he demanded.
"Just lie back and let us do all the work," Kathy said.
Quickly taking off their own clothes, the girls then undressed the teen, poking him playfully in the ribs. Their eyes widened with pleasure when they saw his erect cock.
"It's so beautifully big," Margaret gasped.
They lay on either side of him, sandwiching him between them. Kathy took his balls in her hand and began kissing them. Margaret gripped his cock and ran her tongue up and down it, sending shivers along the teen's spine.
Their hands were all over him at once. On his thighs. His calves. His belly and chest and shoulders and neck. The girls were reaching underneath to caress his buttocks, the small of his back. His arms and fingers and neck and cheeks and lips. He closed his eyes and sighed gratefully, thinking, what more could a guy ask for?
He reached up and fondled Margaret's round, pale tits, making the nipples stand out like tiny soldiers at attention, while she tongued the rim of his mushroom-shaped cock head, making his prick head swell to three times its normal size.
She fisted him, then went down on him until her lips were kissing his pubic hairs.
Kathy, meanwhile, caressed his scrotum, taking first one ball, then the other, into her mouth and sucking on them like candy. She reached underneath to slip her middle finger between his quivering ass cheeks and pressed it against his puckered red asshole.
Tommy moaned, his cock feeling as big as a skyscraper.
"How does that feel?" Margaret asked, her tongue drilling deep into Tommy's gaping piss slit.
"You don't even have to ask," he groaned. "I think I just found heaven on earth!" His fingers trembled with anticipation as they lifted up Margaret's round tits. She leaned over him so he could suck on her enlarged nipples.
When he got tired of feasting on her pointed red knobs, he swung her around on top of him in a sixty-nine position, spreading her legs, her open beaver just inches from his eager lips.
He pried open her slit with thumb and forefinger, then began chewing on her curly pubes. Margaret giggled, but her giggling soon turned to moans of pleasure when his tongue slipped into her gash and made direct contact with her sensitive clitoris.
Her head bobbed up and down as she sucked his awesome tool. Her eyes looked with Kathy's and the two girls smiled at each other. Kathy slipped her digit deep into her brother's rectum, cork screwing it up and up until she felt his prostate gland.
From that point on the teen found it very difficult to remain still on the bed. He writhed under his sister, Margaret moving with him as she lay on top of him. The bedsheets became hopelessly entangled around his body.
The bedsprings sounded and Tommy's slim buttocks moved up and down on the mattress. The smell of female quim sauce filled his nostrils. There was not only Margaret's but Kathy's. The girl was busy finger fucking her friend while she continued sucking on Tommy's thick tool.
The three teens quickly established a mutually satisfying rhythm, each one giving pleasure to the other until an unbreakable link was formed. Fingers became sticky and mouths drooled saliva. Tommy's Adam's apple bobbed up and down continuously as he swallowed. Margaret's rich spicy fuck sauce. Kathy moaned as she felt her clitoris vibrations. She sucked Tommy's nuts as if her life depended upon it.