Mommy's little girl - Sex Stories

Mommy's little girl

My name's Jonathan. I've been with my girlfriend, Emily for a while now. We're both in our thirties. We go along well. She believes in free love for all everywhere. She was raised by hippies, you can tell. She's particularly open minded about sex. We often play out our respective fantasies with each other, even encourage me on some dark shit sometimes. She says we ought to explore our own desires, even thoses we fear. To a certain limit, of course.
I've always found her beautiful: dark blond hair, freckles, a sensual mouth and deep lovely dimples every time she smiles. Physically, she's what you'd call a MILF: not tall but heavy breasted, a thin waist and pretty wide hips. A little fat around the belly and on the ass. Just enough to jiggle when she walks around in her undies. I might add she has what kids on the internet call "slight cellulite". I just love it.
I moved in with her and her daughter a few months ago. Her name is Sofia, she's 15 years old. We go along nicely too, she's kind of come to see me as a father, especially since I moved in. She even calls me daddy. It felt a little overwhelming in the beginning but I've come to like it. We make a nice, close family.

But there's something odd I've started to notice: I'm under the impression that she's been making glimpses at me. I remember once, I got out of the shower and forgot my clothes in the bedroom. So I wrapped a towel around my waist and as I went out walked past each other. I couldn't believe how she ...

... was eating me with those eyes. And when our eyes met, she saw that I saw and she blushed so hard her whole face turned red. I rationalized after that encounter that she was just awakening to sexuality. She was discovering her attraction towards male, teenage hormones and all that. But a few days later I had a weird discussion with her mother. It's after dinner Emily and I are all alone, talking around a glass of wine. And out of the blue, she asks me:
-Do you find her cute, Sofia?
Uneasy, I answer:
-Is that a trick question? Because you are beautiful and she looks like you so...
-I never ask trick questions! I just want to have your opinion.
-Well, yeah, she is.
-Because she thinks you're handsome. Well, that's the word I'm using, she used another when we talked about you.
Suddenly nervous, I didn't know how to react. So I say:
-What of it then?
-The word she used starts with the same letter. What of it? Well I think she's coming to that age when she wants to start experimenting. Sexually, I mean.
My nervousness was definitely not going down with this new statement. I clear my throat and took a sip of wine, waiting for her to continue:
-How would you feel about trying something with her?
I almost spill my drink.
-What do you mean trying something with her?
-Well, kissing for starters. She tells me she's never kissed a boy. And a few of her friends already have and she feels like as long as she hasn't tried it, she can't be seen as mature as her friends. You know ...