Author's Note: This is the last chapter of this series. I plan to write a sequel, although I have other stories to write also. Try and be patient! Thanks for all of your kind comments.
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The sound of Carol's voice was like a cattle-prod into Tim's side. He jumped off of his daughter's sweaty body, horrified, trying to find something to cover himself, to hide his too obvious shame in front of his wife. He found himself crouching behind the side of the bed, mortified.
"Mom!" Marie's voice was a squeak, a child's guilty shriek on being caught doing something wrong. She found the covers and hurriedly pulled them up to cover her nakedness. Then she saw her mother's face.
Carol had been watching for some time. The union of her husband and her daughter, in her bed, showing a passion, a heat that she could never have imagined. It had been primal, animal, and God, how it had turned her on.
"Oh, dear," she said calmly. "I didn't mean to startle you so. And I won't keep you in any unnecessary suspense." Her eyes found her husband's. He was in a state of shock, clearly. Typical. The only person able to keep some sense in the situation was the woman, she feared.
"Uh, Carol, honey," Tim stuttered. "It's, uh, not what it looks like."
She laughed, walking over to the bed. She sat down on the edge across from where he was still crouching, and took her daughter's hand in hers.
"I'm not sure, Tim, how you could explain this as anything other than what it looked like. Believe me, I saw enough of your naked ass pounding into this pretty daughter of ours to be sure. In any case, you have no need to try to find excuses."
"You're not mad, Mom." Marie was looking at her with wonder, still clutching the sheet to her chest. She was gorgeous, her dark brown hair sticking to her cheek and forehead, her cheeks flushed.
"Mad, Marie? No," she smiled. "How could I be? I did everything I could to engineer this. I'm just surprised at how quickly it came to fruition, as it were."
"Engineer this?" Tim's mind was slowly trying to comprehend the turn of events. His wife? Had been trying to get him to... "But why?"
"Why?" Carol looked thoughtfully at her husband. "Why. You should know me well enough to guess that that question is more complicated than it appears." She smiled at him wryly. "In any case, if I'm going to explain myself, I'd rather that you weren't hunkering down back there as if you were taking cover from enemy fire. Come join your daughter up here."
Tim still appeared shell-shocked, so she patted the bed. He slowly stood up, his body still covered in a sheen of sweat, his pubic hair wet and matted around his sadly diminished penis. Marie held the sheet up and he slid under it, still careful to keep some space between him and his daughter.
"Now, how shall I begin?" Carol looked from Tim to Marie, her beloved family, and smiled reassuringly at them. "Let me try to answer your question. There are several reasons why I've tried so hard to bring this about. First, I'm getting older. No, wait, let me say my piece, and then you can talk," she said to forestall Tim's interruption.
"I'm getting older, and you, Tim, you like younger women. No, I haven't felt any slacking off of your passion towards me. But I know how you feel, and I also know that I swept you off of your feet before you had a chance to experience much else. I've felt some guilt about that. Not much, but I have. But that's probably the smallest part of this.
"Second, I know that you've always wanted to have more children, and I can't oblige you in that manner. Going along with that, I suppose, is that I've been feeling the desire to become a grandmother, as surprising as that sounds. So, since I could not be the one to provide you with more offspring, I came across this as, well, an alternative."
Marie gasped at this, and Tim looked positively stricken. But before either of them could object to her explanation, she rushed on.
"And lest you think I'm being entirely selfless, well, I guess the most important reason is still unsaid. I think, actually, that the other reasons are more or less rationalizations to make up for this last one. It's the hardest to reveal, but I've lived with it for too long to deny it any longer.
"The last reason I wanted to get you two together, and the most important reason why I can't get mad at you, is that I'm having an affair. Yes," she nodded as Tim opened his mouth to speak. "Yes, an affair. I've been unfaithful to you, Tim, but that fact is actually not as important as whom I'm having an affair with.
"You see, Marie, Tim, I can't judge you for sleeping with each other, as I'm sleeping with my own son."
Carol blushed as she unshouldered the burden of the secret she had been carrying quietly for so long. But her gaze never wavered, and she met the incredulous gasps of her family with stoicism. Let them think what they would. The die was cast.
"What?" Tim was completely caught off guard. This was beyond astonishing; it was incomprehensible. "IāI don't believe you. You can't possibly be telling the truth."
"No?" Carol looked at her husband, and seemed to come to a decision. "I'm sitting here with a pussy full of his sperm."
"Oh, shit, Mom," Marie squealed. "That is too fucking cool!" She dropped the sheet in her excitement, leaning towards her mother. "Can I see?"
"Oh, my, Marie," Carol blushed. She was surprised at her daughter's reaction, but more surprised at her own sudden reticence. "Maybe in a bit, sweetie. It's a bit sudden all at once."
"Cool?" Tim looked at his daughter, aghast. "Cool, you say? You think it's all right that your mother is fucking your half-brother?"
"Don't be a hypocrite, Daddy," Marie frowned, punching her father in the arm. Carol couldn't help but notice how her pert breasts swayed with the movement. She really was a lovely thing. She felt inordinately proud to have mothered such a wonderful girl. "You just fucked me, didn't you?"
"Ah, yeah," Tim said, flustered. "But that was different."
"Really, Tim?" Carol twisted her mouth in disbelief. "How so?"
"Because you forced us together," he shouted, outraged. Carol and Marie looked at each other. Marie rolled her eyes in disbelief. Carol just smiled. "Uh, no, it's true," he went on. "Marie and I never would have gone this far without your encouragement."
"Daddy," Marie said in an exasperated tone. "You want to be careful there. You're gonna make me think you aren't, like, attracted to me or something."
"Um." Tim looked at his daughter, sitting with the sheet around her hips, her sweet little tits unabashedly exposed. "No, uh, no, sweetie. That's not what I mean."
"Come now, Tim. Be honest. You never thought that I knew what was going on, did you?" He stared at his wife, then shook his head.
"And who was it who pushed himself against me at the car that first night, so that I could feel everything a girl wants to feel on a date? Was it Mom?" He smiled ruefully. "It's true, Mom," Marie turned to Carol. "He was so bad."
"Take a little responsibility, Tim. I may have sown the seeds, but it was you two who tended them and brought them to harvest."