"I need to know. Is she my daughter as well as my granddaughter?"
"Why?"
"Because, ummm, I sort of fucked her."
"What do you mean, 'sort of fucked her'. Either you did or didn't."
"Then I guess I did."
"Oh, Daddy, how could you?"
"She came upstairs here during a thunderstorm, and I had to calm her somehow."
"But, Daddy, that's OUR Thing."
My fortysomething year-old daughter slammed her fists against my chest just as lightning flashed followed by the first clap of thunder. We had come up to my 'glass on three sides' third floor family room in anticipation of a show. And in my case at least, in anticipation of more great sex on my old swivel chair.
We had fucked almost nineteen years ago, on the eve of her departure for grad school. Since it was totally unplanned, we had not used protection. I recall hoping afterwards that she was on the pill. We had resumed our intimate relationship just a few months before when she had come to visit.
Now her eighteen-year-old daughter had come to visit and was just as afraid of thunder as her mother, so one thing had led to another.
After that storm had passed, I had asked my granddaughter what her mother would say.
She had replied that I could ask her myself, as my daughter was coming to visit the next weekend.
So, there we were. Not the best way to break the news, I guess.
The silence was interrupted by not just the pitter of rain on the windows. There was also the patter of little feet on the stairs.
"Grandpa, I'm scared again."
"Oh. Shit," I muttered, not meaning to say it aloud, but my daughter heard.
"Why, were you hoping to fuck me without her?"
Crickets. Or, actually, more thunder. I had no reply for that.
"Or are you hoping to fuck us both, but not sure your old cock is up to it?"
That was more like it, especially given where I had left off with my granddaughter at the end of the last storm. Her mother had called to make sure we were all right, and there was a lot of innuendo that they shared the illicit attraction to me and were not hiding it.
I guessed that I was about to find out how they really felt about it, because my daughter had punctuated her complaint by hugging me tightly and kissing me deeply, holding me there until her daughter came up the stairs.
My old cock started the swell from the proximity to my very available and sexy daughter, regardless of the approach of my granddaughter.
I was pretty sure the math was not right for me to have impregnated my daughter almost nineteen years before, but I had posted a version of my experiences on Literotica, my favourite story site, and overwhelmingly the readers assumed that I was actually the father of both.
"Grandpa, Mommy- what are you two doing starting without me? You both know how afraid of thunder and lightning I am, so you had to know I would come up to be comforted.
I fell backwards into my chair, dragging my daughter on top of me.
"Grandpa, are you playing with Mommy's titties? I know they are bigger than mine, but mine are firmer."
"It was an accident. I didn't mean to grab her there."
"But I'm glad you did," giggled my daughter.
She shifted and settled on my right knee, extending an arm out toward her daughter.
Another flash of lightning illuminated my granddaughter's tentative approach.
"Take the other knee. There's lots of room," my daughter instructed my granddaughter. I spread my knees wider to punctuate the invitation.
My daughter was obviously excited by the turn of events. I could see the hard points thrusting against the front of her sweater and feel the wetness of her panties soaking my leg. She and I reached out to her daughter at the same time. I can't speak for her, but I aimed to take a forearm to guide the young woman to my lap. But both of us ended up grabbing those firm young titties.
The next thunderclap caused her to jump onto my left knee, her flank rubbing up against her mother. She snuggled close to both of us. My cock was stiff, and bulging against my pants, but the way they sat, neither could necessarily feel it, and no one was looking at my lap.
My granddaughter kissed me first. Her mother reached an arm around her shoulders to steady her in place.
"Mmmm," the younger woman moaned, "the only thing better than Grandpa protecting me from the storm might just be the comfort of both of you."
"Is anybody else too warm snuggling like this?" my daughter asked. "Normally, we'd be in jammies sneaking up in the middle of the night."
She lifted her arm from her daughter's shoulder and tugged her sweater over her head, tossing it behind her. I wet my lips admiring how her red lacy underwire bra displayed her mature breasts. Even her daughter had to give her an appreciative glance before undoing the buttons of her own shirt, slowly, one at a time, starting from the bottom. Though I know what I was about to see, I found myself holding my breath in anticipation.
My attention was so fixed on my granddaughter that I almost missed the moment when my daughter cupped my throbbing member in her palm, rubbing it through my pants.
"I think we better let this weapon out to play," she said as she tugged my zipper. My meat rose automatically into the air. It was not cold though, because my daughter wrapped her fingers around my shaft immediately, stroking gently.
"Lick it, Mommy. I want to see you being nasty with your Daddy."
Her tongue wet her lips. I sensed that if she was not about to undo the final button holding her shirt closed, she would have slid to the floor and swallowed my hardness without pausing for permission. Instead, I was frozen in place watching her firm young titties emerge at the same time that my daughter slid to the floor.
Lightning illuminated the picture for me. My daughter at first teasing my tip before deep throating me while I got a fresh appreciation of my granddaughter's chest, with tits that needed no bra. After bobbing up and down from helmet to root, while I played with her daughter's nipples, my daughter raised her head, took in the image of our lust, and said, "I could make you come quickly in my mouth, but you need the stamina to fuck both of us."
