Holly arrives home unexpectedly to discover her mum and dad making love. This prompts her parents to invite Holly and her brother to join them in their bedroom to see some 'practise baby making' at close hand.

It was a beautiful sunny Saturday afternoon in 2004 and Thomas and Holly had decided to go swimming, leaving me and Sue alone. With the kids out the way, Sue suggested that we use the time wisely - in the bedroom.

Before long we were both undressed and getting down to some adult fun. We began with Sue kneeling on the bed and me entering her from behind. I used one hand to play with her tits and the other to rub her clit. I was close to cuming when Sue said that she wanted to go on top. We quickly changed positions and my wife wasted no time in sliding down onto my penis. She began to rock backwards and forwards, grinding herself against my prick and rubbing her clit and moaning with pleasure. I had one hand on her tits and the other on her bum.

We were both so immersed in what we were doing, that we failed to hear the front door opening or the footsteps on the stairs. In our excitement, we had also neglected to close the bedroom door behind us, and the first we knew of the childrens' premature return was when Holly's little face appeared at the door.

Because of the position of our bed, Holly saw us side on. She stood there stunned for a second or two, then turned and left without a word.

"Shit!" I said, "She's seen us"

"Don't worry, she knows where she came from", Sue replied calmly. "I had better go and see if she's OK though."

Sue raised herself off my penis and went to the wardrobe to get her dressing gown. Putting it on, she went to find her daughter, closing the door behind her. I got dressed and went downstairs to get a drink.

Thomas was in the kitchen and he explained that the swimming pool was closed so they had come home. I guessed that Sue was upstair s talking to Holly about what she'd seen, so I decided to stay out their way.A short while later, Sue came downstairs.

"Is she OK?" I asked.

"She's more than OK about it. In fact she wants to see more." Sue replied. I asked her what she meant and she explained that she had asked Holly if she would like to watch us 'practise making a baby' and Holly had apparently said yes, she would.

"She's done a little about it at St Andrews and she's curious to find out a bit more." Sue explained. "If it's OK with you, I've told Holly she can sit in with us tonight"

"What about Thomas?" I asked.

"Ask him if he'd like to join us too?", Sue replied.

"I'm not sure" I said.

"Are you worried about letting him see you doing the most natural thing in the world?" Sue asked. "Anyway, how can we include Holly without Thomas?" she added. After a lengthy discussion, I finally agreed to my wife's idea.

While Holly helped her mum prepare dinner, I took the opportunity to talk to my 10 year son. I began by asking him what sex education he had received at school recently. From what he said, I gathered he knew the basics of how babies were made.

"Would you like to watch Sue and I practise making a baby?" I asked him nervously.

"Are you and Sue going to have a baby then?" Tom asked, looking surprised. I told him that we weren't, and that him and Holly were quite enough thank you!

"Why are you going to practise then?" asked Tom.

"Most parents who have enough children still want to practise because it's very enjoyable" I told him. Thomas seemed suprisingly keen on the idea.

"What about Holly?" he asked "Holly's going to watch too. Is that OK?" I said.

"Yeah" replied Tom.

Sue was pleased when I told her that Thomas was up for it and we agreed to begin the 'lesson' at 9 o'clock that evening. Sue asked me to bring a couple of chairs into the bedroom for the kids to sit on, and these she positioned by the side of the bed.

"Ready?" asked Sue.I nodded. "Thomas..... Holly" she called. The two children came into the bedroom and Sue told them to take their seats while she explained to them what was about to happen.

"You both know how babies are made, don't you? Sue asked the children. Thomas and Holly both nodded.

"Good! but we're still going to test you. Sue said sternly, before turning to me and winking.

"OK, Holly, tell me how a baby is made?" her Mum asked her. The little girl thought for a moment then spoke in a soft voice.

"The man puts his willy inside the lady's diddle"

"Duncan, see if Thomas knows" Sue said.

"OK, Tom, how are babies made?" I asked the 9 year old. "The man puts his willy inside a woman's hole......... and his sperm comes out...... and joins with an egg and that makes a baby grows in her tummy." Tom explained, albeit a little hesitantly.

"Well done both of you!" Sue said, giving them a little round of applause. "Now, we're going to show you how it's actually done. Remember though, that we are only practising. We aren't going to make a baby tonight. Please ask us any questions as we go along"

With the children sitting comfortably, Sue and I got started. We began by holding each other in our arms and kissing. Then we helped each other to get undressed. Sue turned to her daughter.

"Holly, do you remember the proper name for a man's willy?" Holly smiled nervously then said she couldn't remember.

"Help her out Thomas" said Sue. "It's called a penis." her stepbrother replied. Sue carried on talking to her young daughter.

"Holly, at the moment you can see Duncan's penis is soft, but before a man can make a baby with a woman, his penis needs to grow longer and fatter. I want you to watch Duncan's penis and let me know if you see it grow." Sue and I began to cuddle and with my hands on her bum, my penis began to stiffen.

"Mum?.... it's growing!" Holly whispered. Sue gently removed herself from our embrace and turned my body towards Holly. She knelt by her daughter's side and looked at my penis.

"Are you sure?" Sue asked the child, in a sceptical tone.

"Yes, Mum, it WAS growing!" insisted the 7 year old.

"OK, keep watching it. Tell me if you see it growing again" Sue and I returned to our embrace and this time, I began fondling Sue's 34B tits. I felt my penis hardening.

"Mummm! It's growing again." Holly anounced. Sue stopped and knelt down, turning me to face the 8 year old. My penis was now semi erect and was just inches from the child's face.

"I think you're right, Holly" her Mum said. "But It needs to grow a little bit bigger still. Tell me if you see it grow any more." Sue and I hugged again and this time, she began to rub her vulva against my penis, immediately making it fully erect..

"MUUUMMM!.... It's grown more now!" Holly cried excitedly, bouncing up and down on her chair. Sue inspected my erection, to her daughter's delight.

"Good girl! Can you see his penis is now longer than before?" she asked.

"Yes, and fatter!" Holly said proudly.

"Now, it's time for Duncan to put his penis inside my vagina, or as it's sometimes called, 'sexual intercourse'." Sue told the children. Sue climbed on the bed facing her young audience, drew her knees up to her chest and parted her legs as wide as she could. Holding her vagina open, she told the two children to look inside.

"This is where your Dad's going to put his penis, Thomas." Sue explained. Tom lent forward to get a proper look at his first real live vagina. He studied it carefully for a moment, then lent back.

"Put it at the entrance, then wait", Sue whispered to me. I mounted her, holding my prick ready at her hole.

"Holly", said Sue, " I won't be able to see Duncan's penis once he puts it inside me, so I need you to help. When you see his penis going In, say 'in'. When you see it coming out, say 'out'."

"OK Mum" replied the little girl, feeling very important that she had a job.

"Ready?" Sue asked me, and I immediately pushed forward.

"In!" cried Holy excitedly. It took a moment or two for me to get fully inside her. Each movement of my hips providing Holly with an opportunity to continue with her limited, but fairly accurate little commentary. "In.... out...... in.... out........ in.... out...."

Once my penis was all the way in, I began to fuck Sue properly. Raising myself up so I could watch her boobs wobble about. This also had the advantage of allowing the children to have a much clearer view of what was going on.

"In..... out.... in.... out.... in.... out... in... out.. in" The sound of Holly's shrill little voice was threatening to push me over the edge before I was ready. I had to keep stopping and waiting for the feeling to subside, before starting again.

We continued our 'practise baby making' for the next couple of minutes, until I felt I was nearly ready to cum. I then began a series of rapid short deep thrusts into Sue's cunt.

"In..out..in.out...in..in...out.in...in..out" cried Holly excitedly, now finding it difficult to keep up. That was it. My balls couldn't take any more, and my sperm was on its way.

"Arrrggghhh... Jesus Christ.... Sue... I'm cuming... I'm cuming...... yeah.... oh baby" I pumped my sperm into Sue with a series of urgent thrusts, her vagina muscles squeezing every last drop of semen from my penis.

"In!" squealed Holly, making her final pronouncement as I collapsed on top of Sue, hugging and kissing her.

Sue asked Thomas and Holly if she was OK. They both said that they were.

"Duncan" said Sue, "pull out of me so I can show the children." I rolled off my lover, curious as to what she was going to do.

"Duncan's sperm is now inside my vagina", Sue explained to the children. "Would you like to see it come out?" The children said that they would. Sue placed her hand over the entrance to her vagina and proceeded to squat on the bed facing Thomas and Holly.

"OK, watch" said Sue I got up off the bed and went around to stand behind the kids. Sue removed her hand and lent forwards. Nothing happened. Sue shifted her balance slightly but still nothing. "

I can feel it in there" she said to me. She adjusted her position once more, leaning a little more forward and placing her hands on the bed in front of her for support.

"Here we go, I can feel it coming now" she said. The children and I watched as small globules of thick creamy white fluid dripped one at a time from Sue's vagina. Wiggling her bum produced a small trickle, which slowly dribbled out to form a little pool of semen on the undersheet, before rapidly soaking into the material leaving a wet patch.

"I think there's still some more in there" Sue said, looking between her legs. Returning to a more stable position, she pulled her outer lips apart, causing another little trickle to leak out.

"I think that's it now" Sue said, and she came around to sit on the edge of the bed facing the children.

"Now, if we were trying to make a baby rather than just practising, I would have left the sperm inside me. Then the sperm would try to swim up into my womb to find an egg to join with. If that happens, a baby starts to grow in my tummy."

"How often do you need to practise?" asked Thomas "We like to have sexual intercourse as often as we can. Practise makes perfect." Sue told him. "Is there anything else you'd like to ask about what you've seen?" she asked the children. The kids both shook their heads.

"It's a lot for you to take in", she continued. "If you'd like to ask either of us any questions over the next few days, then please do."

"One very important thing", she said sternly. "You mustn't tell anyone about what you've seen tonight. Making a baby is a very private thing. We don't mind you two knowing about it, but you must NEVER, EVER tell anyone else. Is that clear?"

"Yes" replied Thomas, his voice shaking a little.

"Holly? Do you understand what I said?"

"Yes mum, I won't tell" Holly replied.

After we had put the kids to bed, we talked about what had happened. Sue told me that she had experienced the best orgasm she had ever had. "Did you like Holly's little contributions" she asked me.

"I loved it when she kept saying "It's growing" I said, imitating Holly's voice.

"I thought you would" Sue replied.

"And the 'in out in out' too" I told her. "I'll get her to join in next time then." my wife said with a mischievous smile on her face.

"Next time?" I said "That was only their first lesson. I think they need a lot more, don't you? she said smiling.