OK let's try a little experiment. Here's two similar beginnings to a story, but in one it's about his stepdaughter, and in the other it's about his real daughter. (Both girls are 18, if that helps.) You tell me which story I should continue - do you want to read about daddy/daughter, or stepdad/stepdaughter? Choose A or B ...
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*A is for Angelica, the daughter*
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It all started with the tee shirt.
My wife and I were in bed, talking quietly about the kids and the day and whatever, and I started getting a little frisky. Rubbing her shoulders turned into caressing her ass, and then we were kissing, and I was biting her neck, and she was squeezing my cock through my pajama pants. With a low growl (I wasn't even sure the teens were asleep yet) I pulled down my pants while she pulled down her underwear, and in a moment I was on top of her.
I pushed up her tee shirt and started sucking on her nipple. She whimpered a little, and while I massaged both breasts, thumbing and pinching whichever nipple I wasn't sucking, she whispered encouragements, and moaned as quietly as she could. I pressed my growing hard-on against her, again and again. I pulled back on my knees to rub the head of my cock against her glistening pussy lips, dipping in just slightly, then teasing her clit with its warm firmness.
She pulled her shirt down slightly to play with her nipples through it, stroking and scraping her flesh through the thin material. I cocked my head slightly.
"What shirt is that?" I whispered.
"I dunno," she said. "It was on the floor next to the bed, so I grabbed it."
I knew exactly what shirt it was. In large letters, it advertised a popular restaurant in Colorado. And only one of us had been to Colorado in recent years: my daughter, Angelica, on one of her weekends with her birth mother.
I leaned forward, pressing into her inch by inch. She wasn't quite wet enough, which I love - that bit of resistance. (She's told me she loves it too.) She reached her hands up under my own tee shirt to grip my back as she spread her legs further, pulling me inside her.
Suddenly, I pictured my daughter beneath me, in this shirt I'd seen her in so many times. Slender, blonde, with a runner's build - so beautiful, and looking more like her mother every day. I shook my head with a violent jerk, as I started pulling out. I cupped my wife's breast in one hand, thumbing her pebbled nipple, and forced myself to focus on my wife's face. So different from my daughter ... Angelica's smile was less full-lipped than my wife's, but no less loving, and her forehead ... her forehead would be dotted with sweat just like that, if I was inside her ...
Oh God!
"I love you," I growled, focusing again on my lovely, sexually adventurous wife. Her breasts might have sagged a bit with age, but she was still an amazing lover. So ready and willing, so into trying new things, and - I squeezed her breast again - and ... *younger than this one, firmer, not over-large, but like a succulent peach under this same tee shirt, so many times, how would they be bouncing right now ...*
Fuck! Not now, not now ... I needed to stop thinking of my daughter ...
My wife's head was thrown back, her mouth open. It was so hard to stay quiet sometimes ... Her eyes strained with pleasure and need and with the clashing, desperate, conflicting desires to scream and to stay silent ...
My muscles were straining - pushing toward the peak. I couldn't quite reach it. "Chase it," she hissed. "Chase it, go get it." She was watching me intently, with that little smirk she wears when I'm getting close. She loves watching me go over the edge.
I couldn't. I was balanced near the top, but I was at war with my libido, too many thoughts, shifting focus. Beating away thoughts of that innocent child to try to focus on my wife, but ... it was too much distraction. I was chasing it, but my orgasm was elusive.
Fuck it. I closed my eyes, and imagined. Who would it hurt, really?
Her tight little running shorts, the long legs I'd noticed without realizing I was noticing them - I imagined them wrapped around me, imagined the shorts pushed aside to make room for my cock. Oh Christ, her young pussy would be so tight around my shaft ... squeezing it ... milking it dry ... And her nipples, god the nipples, big as cherries on those peach sized breasts that I'd seen so often, my baby girl hardly ever wore a bra, those fat, thick nipples poking out through the big letters on the Colorado shirt as I pounded into her again and again.