We explore our true feelings for each other, and manage a conventional life to the outside world. I still go to work, Jenny, has made good progress in her college.
Her petite frame delayed her passage into womanhood and made her the target for some of the school bullies, but that is all behind her now.
Our love for each other gave her the confidence to stand up for herself. Nature caught up with her a few months ago, She now has full control over her periods and she is on the pill, for the time being.
Her hips are starting to give her a woman's shape and her boobs now fill a 32a bra, not exactly 'melons', but oh so cute and incredibly sexy.
Before Jenny was born, her mother and I were going through another bad patch, during which I had a fling and a daughter, with a work colleague.
Sky is now 18 and although I have always paid maintenance and everyone knows who everyone else is, Sky and Jenny have never met. Even I have only met Sky a handful of times.
That is all about to change as Sky's mother is about to get married and wants me to, 'get to know my other daughter', whilst she goes away on honeymoon with her new husband. In other words I am a cheap, long-term baby sitter.
After much discussion between Jenny and I, we think we can make it work, without revealing to the world, what a lot of people just wouldn't understand.
I have booked the necessary 3 weeks off work, the first 3 weeks of the summer holidays. Our plan is to let Sky have 'Jennys room'. Apart from keeping her clothes in there, for months now, Jenny and I have shared the same bed, but our cover story will be that Jenny is on the travel bed in my room, so that Sky can have her privacy.
We even buy and set up a travel bed. We may even lean across it and fuck a few times, but at least it adds to our secret.
The day of the wedding comes. A quiet registry office do, with Jenny and I among the guests. This way Sky's mother and new step father can leave the very afternoon of the wedding and Sky can return with us.
My two daughters, half sisters, sit in the back of the car during our drive home. Both girls chat happily and it seems they will definitely get along.
Jenny is wearing a new, thin summer dress and Sky, with her role as bridesmaid, still has her very revealing dress on. Jenny was given the chance to be a bridesmaid too, but declined, as she felt she didn't really know anyone.
As I glance in the mirror, I see Sky is very different to Jenny. She is a full six inches taller and has a very developed figure. A hint of puppy fat remains, but her boobs draw the gaze of any man who meets her. She must be the envy of her school year with, what I am guessing are, perfect 36d, teenage tits.
Jenny and I catch each other's eye and we are both aware that we are both looking at Sky's tits. We share the same knowing smile.
I wonder for a moment how my little darling Jenny would look in such a low cut dress.
Jenny asks me, "Daddy, when we get home, can I show Sky up to her room?"
"Of course," I reply. "It looks like you girls are getting along. That's wonderful."
"Thank you daddy," Jenny answers.
On the few occasions I have met Sky, she always just called me 'dad' and it was never really comfortable between us, now it seems things are changing for the better.
Sky asks outright, "May I call you Daddy too, it sounds so nice?"
I reply, "Of course, Sky. You can call me anything you feel comfortable with."
At which point Sky bends and whispers in Jennys ear. Both girls giggle.
"Ok," I say, "What's the joke?"
Sky continues giggling, but Jenny gives the answer, "Sky said her mum calls you the 'biological one', but we both prefer Daddy, Daddy."
Again they both continue laughing. I am so happy my girls are getting along. It will make the next few weeks much easier.
The rest of the drive home was very similar, lots of whispering and giggling. Lots of me checking the mirror and the faces and bodies of my two daughters.
It was past 6pm when we arrived home, not late at all, but it had been a long day.
"I think pizza for tea, girls. What do you two think?" I ask.
"Yay, pizza!" They both reply.
"Ok," I continue, "I'll bring your cases in Sky. Jenny will show you around and I'll just nip out and bring back our tea."
"Ok Daddy," they reply.
Jenny continues, "Yes Daddy, of course daddy, love you Daddy!"Again they both laugh, as Jenny is teasing me and we all love it.
Sky has two cases which I just put inside the hall way, "Ok girls, I'll get the pizza. It may take a while. This time of night there's bound to be a wait. Jen, when you've shown Sky around, sort some cokes for you both and get the plates ready for the pizza."
"We won't need plates for pizza, daddy and we'll be fine," Jenny states and again laughs.
Sky adds, "You have to eat pizza with your fingers. It's a well known rule, daddy." Followed by more laughter.
It seems that during the drive home, at some point I became hilarious, or I'm being teased. I think my two girls are in cahoots, either way everyone is still happy, so long may it continue.