@2

"You can't be! Aren't both of you on the pill? How have you managed to get pregnant? Is this some kind of sick joke?"

It was Susan who spoke first. "I thought I was too old. It never occurred to me that I might still be fertile. I never planned for this to happen."

There was silence again, with both she and Marcus looking at Molly, who refused to raise her head and meet their gaze.

"Molly? How have you managed to get pregnant? You were on the pill, weren't you?"

Molly began sobbing, her voice cracking as she tried to speak.

"I came off it... I wanted Marcus's baby... I wanted him and me to be a..." Her voice trailed off as she continued to cry.

It was the end of November, and Christmas would soon be upon them. Susan and Molly discussed their predicament often, but neither of them could induce Marcus to take part or even give an opinion on what was to come. By the time the festivities started, the sex that they had once indulged in had ceased.

After the New Year, he made a decision and announced to them both that he was moving out. There had been tears and recriminations, especially from Molly, but Susan could understand what he was going through.

He was still young and not ready to become a father yet. If it had been that reason alone, she sensed he would have stepped up to the mark. This was different, though. Whichever gender she gave birth to, it would be Marcus's son or daughter, but also, ostensibly, his brother or sister. It was the same with Molly. She would bear a child, one that would be her brother's but also either his nephew or niece. It was too much for her son, and she understood why he decided to walk away. It had been fun; that was all that he had wanted. He had never asked his sister or mother to get pregnant, and there was no way he could have a proper relationship with either of them.

They managed, after a fashion, helped by the money that Marcus agreed to send each month. Susan worked right up until the last moment, and Molly continued at college. Just like her mother, she put in an appearance each day until her baby was due, returning almost immediately to finish her course.

They both missed Marcus and not just for the sex; he had been a shoulder of support for the both of them.

With Molly now at home looking for work, she took care of both babies so that her mother could return to her job. When Susan was off, she looked after them so that her daughter could have some freedom. Molly had a girl, and her mother a boy, but they had no idea where Marcus was to inform him.

Their pregnancies had brought them closer; mother and daughter were now the best of friends. More than a year would pass before Susan heard from her son again. Her daughter had found work, earning a wage nearly three times what Susan could. It helped immensely as they did a swap, with Molly working and her mother staying home to raise the two children, who were now becoming toddlers.

Susan had just put Brian and Debbie down for their afternoon naps when the doorbell went. She swore for a second, hoping it had not disturbed the two kids.

Her heart leapt when she opened it. Standing on the doorstep was her son.

"Hello, Mum."

Dragging him inside, she wrapped her arms around him, holding him tight and remembering the past. Susan wanted to cry when he raised her face and kissed her.

Holding her at arm's length, Marcus looked her up and down.

"You've lost weight, and you look fantastic."

Susan blushed. After the birth of her second son, she lost weight. She wasn't as slim as her daughter, but she was still svelte compared to before.

"Are you coming home?" She asked hopefully and was disappointed when he shook his head.

"I'm sorry, mom, it wouldn't work here. However, I've had an idea."

In the lounge, after she had made coffee, Marcus outlined his thoughts.

"I have been working away, several hundred miles from here. Other than my workmates, nobody knew me. Nobody would know you or Molly. It would be a fresh start. I know it would not be easy, but there is plenty of work there. Molly could find a job, and so could you -- just a part-time one if you wanted."

Susan immediately understood what he was suggesting -- moving away to an area where no one would know them. Where they would look just like an ordinary family. Who was to say that Marcus and Molly were brother and sister?

She started to get excited as more possibilities sprang to mind. The three of them could have a life together again, and her son would return to her bed.

The thought awakened desires; it had been over a year since he had last made love to her. She could feel the desire building between her legs and her nipples hardening as they began to throb.

"I think it's a great idea. We just need to convince Molly. We could sell this house. I'm certain we would get a decent price for it. Have you somewhere in mind?"

Marcus laughed. He could see that his mother was all for it.

"If the little ones are asleep and it will be several hours before Molly gets home... we could always." He raised his eyes upward.

Susan allowed him to undress her, his eyes sparkling as he exposed her body bit by bit. By the time she was naked, the bulge in her son's pants looked painful.

Marcus decided that, if anything, she looked more desirable than ever. In no time at all, he was naked, his erection pressing against her mound as they closed on each other and kissed. His mother's breasts were crushed against his chest; she may have lost weight, but she still had an ample bosom.

After such a long abstinence, foreplay was forsaken. All Susan wanted was to feel his manhood inside her once more. She was on the bed, legs raised and open, as she watched Marcus slip between them. And then she was in seventh heaven as his cock spread her labia and pushed its way into her hot, moist pussy.

Marcus thrust into his mother steadily, watching her face as he fucked her. There was no denying that he had missed her; he missed abusing her body. With her loss of weight, she looked even more delectable than she had previously. Her eyes opened, and she smiled at him for a second. And then it was quickly replaced by a groan, a look of pleasure spreading across her face as he continued to shag her.

The impetus of his hips increased, their groins smashing together. Susan's legs came up, wrapping around him as, with each thrust, she dragged him inside her fanny and became vocal as her climax approached. His hands went to her tits, making them bulge as he gripped them firmly, her nipples standing proud, enticing Marcus to bite down on them, nipping each teat between his teeth.

It was a headlong dash for the finish line, his mother's cries muffled by the pillows so as not to wake the kids, as he filled her now-sloppy cunt with his seed.

They had half an hour of sweet talk, with Susan, at last, telling her son about the occasion she had witnessed him and his sister indulging in sex.

"Is that something you would like to try?" His eyes shone with excitement. As she had predicted, Marcus was all for the idea, his arousal developing once more as he imagined being in bed with his mother and sister.

Before he could become frisky again, the sound of the toddler's waking took his mother from her bed. It was a penalty he would have to learn to live with if Molly and Susan accepted his proposal.

She brought them in for him to meet -- the first time that he had seen his son and daughter. He watched as his mother dressed, amusing the two infants until she took them downstairs, and he could get dressed as well.

His mom glanced up when he went down. 'You're going to stop for tea, aren't you?'

"Yeah, I need to pitch the idea to Molly."

Marcus and his mother chatted as he bounced his daughter up and down on his knee. At one point, both legs were going, as his son insisted, he wanted a turn as well. The sound of the front door opening brought him back to the present. He waited with bated breath as his sister entered the lounge.

Molly was in shock. She did not know whether to be angry or delighted.

"I'll feed Debbie and Brian. You have an hour; why don't you go upstairs and talk?" Susan suggested.

By talk, she meant sex. Molly still pined after her brother, and if this idea was going to work, she needed her daughter in the correct frame of mind.

It was inevitable that they would end up in bed. Molly only speculated but was pretty sure that Marcus and her mom had already indulged.

Afterwards, he explained his idea to Molly. "That is what I thought... it would mean we would have to pretend to be married, husband and wife."

It was what she had dreamed of when she had stopped taking the pill and then gotten pregnant.

"I need to give it some consideration," she told him, "we have our daughter to think about now."

Marcus nodded.

"Are you staying the night?" she asked.

"Why? so that I can spend it with you?"

Her face flushed a little. It was as though he could read her mind, which wasn't hard.

"I suppose mom will want you in her bed," she said, taken aback by her brother's reply.

"I believe our mother would like to join us in bed," he laughed.

It took Molly a while to get her head around his statement, but his mouth nuzzling her breasts, and his finger stroking her twat, helped to persuade her.

They dressed and then went downstairs to eat together, with the two women disappearing afterwards to put the children to bed.

After a decent amount of time had passed, Marcus rose to his feet.

"Should we?" he asked.

"Hopefully, this will be a night to remember," he thought as his sister and mother went ahead.