"My God," Kyle groaned, "you want it too, Sis? So soon again? Looks like I'll have to take you both at once."
But the two pussies were locked together again, and Marcy was panting as she ground into the other girl, thrusting frantically in her efforts to find release.
"Hey, she's about to cum," Karla laughed, and used both hands to crush the girl to her. "Wow, I never knew a chick who could cum so fast from just a little friendly cunt rubbing."
"Are you cuming, baby?" Kyle breathed in her ear, his hands moving up to her breasts and squeezing hard. "Are you about to cum and overflow with groovy cunt juice?"
Marcy hardly felt his touch or heard his words; her whole being was concentrated on the furnace of lust his sister was fanning into an all-consuming blaze by rubbing into her cunt lips.
Marcy trembled, and Kyle slid his hands down to her belly, his fingers pressing rhythmically at the very base of it. "There she goes!" he said, just as Marcy sobbed convulsively and her vaginal muscles quaked with her orgasm.
When it was over, she sagged weakly against Karla. "Thank you," she murmured.
"That was nothing," Kyle said, turning her around to face him. "Feel what I've got for you."
He thrust his hips forward and bucked against her, not entering her, but just pushing his cock so close it rested lengthwise between the lips of her cunt. Fresh waves of lust swept through Marcy, and she could feel the labia tightening as he teased the head of his cock along them.
"Does it feel good? Do you want it?"
"Yes – oh yes," she said. "Give it to me!"
"Gladly," he said, getting his hands under her bottom and tilting her backward into Karla's arms. Marcy's legs floated up on either side of him, and he stepped forward, the resistance of the water holding him to an exquisite slowness as the head of his cock started to push between the receptive folds of her cunt.
"Ohhhhhh," Marcy moaned, as Karla inched her upward until Kyle could place his hands on her waist and she could reach his shoulders. Then she clasped her heels at the base of his spine and began to ride him, feeling the marvelous friction touch every nerve ending in her throbbing vagina.
He didn't stretch her as Dr. Villiers had. The tip of his shaft rested comfortably against the far end of her canal, rather than threatening to shove on through her back when he was in her fully. It wasn't as wildly painful nor as incredibly erotic as being assaulted by the doctor's cock, but it was more than adequate. She could grip it with her inner muscles and feel them suck him deep as she pulled herself toward him and then pushed away, the water and Karla supporting her as she savored the delightful fucking.
Then Karla gradually let go of her and circled around their joined bodies, examining them from every angle. "I hope Dr. Villiers is getting a good shot of this," she said. "You two look splendid coupled like that. But maybe I could add to the total picture, not to mention your enjoyment, if I made it a threesome."
Marcy didn't pay much attention to the words, but when passionate kisses began to rain on her back and shoulders and buttocks, she knew what Karla meant. Then the red head squeezed between Kyle's chest and her breasts, and a mouth like a suction pump fastened on one nipple and then the other. Karla's fingernails scratched lightly down the crevice that divided the cheeks of her ass. Marcy gasped and lunged violently forward.
"Stop that!" Kyle said to his sister, holding Marcy tight against him for a moment. "You want it all to be over before it barely gets started?"
Karla giggled and transferred her attention to him. He had spread his legs wide to balance himself, and now began a gentle rocking motion to help Marcy slide back and forth along his prick while she rotated her pelvis and flexed her muscles to suck him deeper. Karla stroked and kissed her way down her brother's back and thighs, and when she reached his knees, she ducked underwater and came up directly under their interlocked genitals. She reached out a finger and touched Kyle's cock as it surged in and out of Marcy, then laid her finger along the length of the prick and let it ride into the cunt.
Marcy and Kyle both reacted strongly to the extra stimulus, and Karla broke through the surface of the water laughing. Then, as Kyle started pounding into Marcy so hard she was almost knocked from her perch, Karla got behind the other girl again, wrapping herself around her back and rubbing the big, pointed nipples up and down her spine. She curled around Marcy so tight that it seemed as though she must be trying to capture part of her brother's surging flesh.
Marcy gasped as the furry wet lips of Karla's pussy rubbed against her ass cheeks, and Karla's breasts jabbed into her upper back. Karla's fingers manipulating her breasts, plus the hard meat filling her, was driving Marcy berserk with lust. Her breath rasped in and out, and she raked her nails down Kyle's back as she jerked and writhed against him.
"Go baby, go!" Karla urged, working her fingers down to where her brother's prick was embedded in Marcy's blonde pussy. She found the girl's clit and began to massage it, while Kyle rammed in and out of the hot slit below.
Marcy let out a wild yell and came in a frenzy of movement, her head rolling and her heels kicking. Then she felt the throbbing of Kyle's shaft, as though her spasming cunt had pulled him over the precipice into pleasure's deepest abyss. The hot gush of his ejaculation filled her to overflowing.
Marcy sobbed with joy as Kyle shuddered and smashed into her again, emptying himself completely into her cunt.
When he finally disengaged himself from her and set her on her feet, he gave her a little swat on the butt. "Wow, you almost sucked me dry, you hot-cunted witch!"
"And I feel as though I've been run through a wringer," Marcy said, sinking down into the water to rinse off the last of the soap.
"You two stop talking like that," Karla said. "I've only cum once and my cunt is burning like fire. Don't you dare be worn out!"
"You know me better than that, doll," Kyle laughed. "Remember that night in Acapulco when I fucked you in the mouth, in the cunt, and in the ass and still had enough strength left to sodomize the bellboy and blow that bearded actor, what's-his-name?"
Marcy did feel a little tired. In the last two days she had engaged in more sexual activity than she had ever dreamed of doing in her whole life. She had been fucked, had her cunt eaten, and blown a man. It was all kind of scrambled up and run together in her mind, and she told herself it didn't matter how much more she did. Some other time, in some other world, she would rest. Right now, she would gorge herself on all the male and female flesh she had access to. She plowed through the water and clambered up onto the slanting side.
"Lie down, sweet Marcy," Karla said. "Just lie still and rest and let us both make love to you."
Marcy stretched out, flinging her arms and legs wide. The Karlows came to her, one on either side, and crouched beside her, their flushed faces close to her breasts.
"Love apples," Karla breathed, cupping a mound between her hands. "Firm, crisp, delicious love apples." Her lips fastened greedily on a nipple, and she began to suck.
"And I'll eat this one," Kyle said, and began laying it all over with his hot, wet tongue.
Marcy looked down at the two red heads, and listened to the sucking, slurping sounds of the two mouths. Then she lay back and let the fantastic pleasure quicken and reheat her blood.
She let herself drift in a lustful haze as four hands moved over her body. She could distinguish between the slightly heavier masculine ones that crawled up one thigh, and the lighter-fingered feminine touch that tickled like feathers across her belly. But both were moving steadily toward the same target.
What a strange sensation it was to lie there in a few inches of warm water and feel these two golden people worship her body. The Marcy of three days ago would have been shocked and horrified at the mere thought of having sex with another woman; she would have been incapable of imagining fucking a man and a woman at the same time, much less a brother and sister! But that was the pre-Dr. Villiers Marcy. This was the new, liberated Marcy, and she was not only doing it, she was thoroughly enjoying every second of it.