Sophie was unusually quiet during dinner that evening and when I looked at her, sometimes I caught her staring at me with a faintly quizzical expression on her face. I could tell she was still thinking about the conversation we had had earlier about sex. I think I was almost as nervous about this as she was, but eventually I plucked up courage and said "Sophie?"

"Yes, Daddy?"

"Has Mommy never talked to you about boys and sex?"

"Not really, Daddy, every time I bring the subject up, she just says I'm too young and changes the subject."

We both sat there silently for a few moments, eating our dinners, digesting what had been said.

"Okay, let's get dinner finished and the dishes put away, then we can pour ourselves a drink, sit down on the sofa and have a little best friends chat. 'Coz that's what we are now, isn't it baby? We're best friends?"

"Yes, Daddy, we are" said Sophie, solemnly. "We have secrets that only we know, so we MUST be best friends!"

"Damn right, girl!" I said.

"Daddy! You said a swear word!"

"Oh don't worry about it, hun, you'll be hearing a few more so called 'swear words' in a few minutes!"

"I will?" enquired Sophie, a surprised expression on her young face.

When all the dishes were in the washer, I poured myself a whisky on the rocks and made up one with lots of lemonade for Sophie, but in the same sort of glass as mine, and as I handed it to her, I could see the pride in her face that she was drinking the same drink as Dad ... well, almost.

We settled down on the sofa and chatted for a while about school and the other girls and what they knew or thought they knew and what Sophie had heard and what she didn't understand. "Sophie" I said "do you know the proper names of the male and female sex organs?"

"What? Like willy and that?"

I laughed. "No, hun, willy is a slang name for the male sex organ - the proper name is a penis, but most people these days call it a cock, or a dick. I think when we talk about it, we should use the word 'cock'. Then there are the testicles ..."

"What are they?" Sophie said, wide-eyed.

"They hang in a little sack beneath the man's cock, and that's where he makes and stores his sperm and semen, ready for when he wants to make a baby. Most people call these a man's 'balls'. Have you heard that word?"

"Um yeah, I think so - I wondered what they were, Daddy!"

I tell you what, baby, I think it would be better if we both got undressed and I could point out the various bits as we talk about them - it'd be a lot easier. I got up and closed the blinds on the window, put another log on the fire and started to unbutton my shirt. Sophie rather nervously stood up too and pulled her top up and over her head. She hadn't put her bra on today, I noticed, her thin cotton vest showing the swell of her budding breasts and the nubs of her nipples.I felt my cock twitch and begin to stir.

"Baby, I need to tell you something before we go any further."

"What, Daddy?"

"You know I said you're a very sexy young woman?"

"Yeah"

"Well, when a man gets naked with a very sexy young woman like you, certain things start to happen."

"What do you mean, Daddy?"

"Well, his cock starts to swell and go bigger and longer."

Sophie looked quizzically at me, her head coked to one side.

"Why?"

"I'll explain all that later, hun, let's just finish getting undressed."

Sophie accepted this and pulled off her vest, giving me my first uninterrupted view of the two firm little mounds of pubescent flesh on her chest, each topped with the cutest dark pink nipple I had ever seen. I tried not to stare and took off my shirt, then started unbuckling the belt of my jeans. Sophie did the same and pulled her jeans down and stepped out of them. I did the same and then pulled my boxers down, exposing my by now semi-erect cock. Sophie stopped dead in her tracks as she saw an adult male cock for the first time. Slowly her face turned up to me and said, "Holy crikes, Daddy, that's huge!"

I smiled down at her and said "it's not that big hun, it's probably about average for an adult male."

"I've only ever seen a couple of the boys at school when they've wanted to make us girls scream, and they were TINY compared to that!"

"Take your pants off, hun, and we'll carry on. Are you warm enough in here? I've put another log on the fire."

"Um, yes, Daddy, I'm fine. Can I have another of our special drinks?"

"Sure can, hun." I said, making up another for her. I poured a drop of whisky in and then thought again, pouring another small measure. Adding the lemonade and stirring, I passed it to Sophie. "There you go, hun, this will help keep us warm too! Now hop up on the sofa with me and we'll continue our chat."

Sophie scrambled up alongside me and I put my arm around her shoulder as we sat staring into the fire and sipping our drinks. I could tell by her voice that the whisky was having an effect on Sophie, she was getting very giggly.

"So, you know now what a cock and balls are. Do you want to touch them? If you touch and hold my cock, you will probably see what I was telling you about a man getting ready to make babies when he's with a sexy young woman."

Sophie put her drink on the coffee table and turned to me. My cock was laying across the top of one thigh, still slightly engorged from Sophie's proximity. She tentatively put her hand out and picked it up.

"It's heavy, Daddy!"

"Try sliding your hand up and down it a few times, see what happens."

Sophie looked down and gripped me tighter then slid her hand up and down a couple of times. My hand was still over her shoulder, and I slipped it down so that my fingers were brushing her nipple. This, combined with her hand motions, made my cock start to swell further. Sophie could feel the change under her hand and see it visibly getting thicker and longer. She looked up at me for some sort of confirmation and I just said "That's great, baby, you sure you've never done this before?"

"Um, n-n-n-o," Sophie stammered.

"Well, you're doing a real good job, baby - you're a natural!"

Sophie beamed up at me and resumed her stroking until my erection was complete and my breathing was starting to get a little ragged.

"Sophie, baby?" I croaked, my throat getting very dry.

"Yes, Daddy?"

"You remember me telling you earlier about sperm and semen that a man makes in his balls ready to make babies?"

Sophie just nodded, wide-eyed, at me.

"Well, if you carry on holding my cock tightly like that and rubbing it up and down faster, then you might get to see some come from my balls and out of the hole at the end of my cock."

"Oh, okay, Daddy, I'll try!"

She bent her head down and resumed her stroking, biting on her lower lip with concentration.

"Oh, baby" I breathed, feeling the first stirrings in my balls "that's great, I can feel the cum getting ready."

"Cum?" said Sophie, puzzled.

"Yes, hun, 'cum' is the word most people use to describe the sperm and semen that comes from a man's cock. When that happens, it makes the man feel really good and have what is called an orgasm. Just keep pumping my cock, baby ... that's right ... faster now, faster ..."

I looked down and saw my 10 year old daughter's hand wrapped around my cock, my one hand was feeling up her right tit and I could hold back no longer.

"Baby, I'm cumming!!!!"

Suddenly, great ropey strings of cum erupted from my jerking cock. Sophie squealed, partly in shock, and partly in delight at what she'd done, I think. A couple of drops splashed on her face, some landed on her tits and the lots dribbled down the sides over her hands.

"Keep rubbing, baby, but a lot slower .... yeah, that's good, slower ... slower .... bit more .... that's great ..."

"Daddy?"

I realised I had laid my head back on the back of the sofa and closed my eyes, my orgasm being one of the best I'd had for a long, long time.

"Yes, hun?"

"Did I do that right?"

"Yes, baby, I said, giving her a big kiss and hug "you were fantastic. If that's the first time you've done that, then you're a natural at all this. I don't think I will have to teach you much."

Sophie looked up at me with her big brown eyes and murmured "Oh, I think you probably have a lot more to teach me, Daddy."