Grandma's Secret
Copyright© 2025 by SquattingEagle
Chapter 8
Incest Sex Story: Chapter 8 - Brother and sister stumble on their dead grandmother's diary and start reading it. Grandma's life was interesting to say the least and it opens the door to a more intimate relationship between the siblings.
Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa Consensual Fiction Incest Brother Sister Oral Sex Pregnancy
Friday
Audrey and I had agreed to go back home in the afternoon and be there in time for dinner. This also meant I really had to go to the university in the morning, as there was a lot of work I had been putting off these days. I much rather would have spent our last day alone with Audrey, but if I didn’t get my work done now, I’d be in serious trouble later. If I did my best and worked as quickly and efficiently as possible, there was maybe time for some quality time before we went home.
It was around noon, and I was in the university library, reading articles, when my phone buzzed. It was a text from my sister, saying, “Big news. Need to talk now.”
I knew that, as much as I hated to, I would have to postpone my work a little more. I quickly copied some of the articles I needed to read and went home. As I closed the door behind me, Audrey got up from my couch and walked up to me. She looked anxious. Whatever she had discovered, it had left quite an impression on her.
“Here, you’ll need this,” she said as she handed me a glass of scotch.
“Is it that bad?” I asked.
She nodded. “Sit down and read it yourself.”
I did as she said and picked up the book.
“I came across a random bit of trivia a few days ago, and it reminded me of something that happened at Donna’s wedding, six years ago.”
“After the wedding, when all the other guests had gone home, Donald came to me. He asked if Michael’s parents had been present. I said, of course, in fact, they had been sitting next to me and the couple. He said that was what he thought. I asked him why, and he said the strangest thing.
“He said, ‘They have blue eyes.’ I asked what he meant by that remark, but he wouldn’t tell me and said, ‘Nothing, just saying.’
“At that time, I didn’t know why he said that, but now I understand. A pair of blue-eyed parents can’t produce a brown-eyed son. What Donald was saying was that Michael couldn’t be their biological son. I keep thinking about it, and although it really is none of my business, I’d like to hear their story.
“I went to visit Michael’s parents. I delicately steered the conversation towards her son. After a few glasses of wine, she confided that she and her husband couldn’t conceive, no matter how much they tried. After a series of medical tests, it was discovered that she was infertile, and there was no hope of her ever having a baby. Sometime later, they started talking about adopting a baby, and that’s how they got Michael. Donald had been right; Michael is not their biological son!
“It was comforting to hear her story, how giving up a baby could make another couple so very happy. I could only hope my son, and my suffering, had made his new parents just as happy.
I tried to inquire if she knew anything about the birth mother, but she only knew what was told, that it was an unmarried woman who had given him up for adoption. I was a bit disappointed by that, as I would have liked to meet someone who had gone through the same things as I had, to finally have someone to relate to, someone who understood the pain.”
“So, Dad is adopted then?” I asked after I finished the page.
“Apparently.”
“And that’s what you wanted to tell me?”
“Just wait, it gets worse.”
“Worse?”
“Much worse.”
The feeling of unease was getting stronger again. I took another sip of whiskey and waited while Audrey leafed through the diary and handed it back to me. She was nervously walking up and down the room while I was reading.
“I casually mentioned to Donald that his suspicions about Michael being adopted were right. He wasn’t surprised at all. He just nodded and said he knew this already. I asked how he knew this. Donald hesitated a moment and then confessed that, after the wedding, he had hired a private investigator to look into it. I thought it had been excessive to hire a detective to investigate his niece’s husband, but he said I should listen first to what the detective had discovered.”
“Donald told me that the official identity of Michael’s birth mother was still unknown, but that his investigator had discovered enough. He proceeded to list the information his private investigator uncovered from the military records, like blood tests and place of birth. It was the very same home for unwed mothers as our parents had sent me to. An uncomfortable feeling grew inside me as I began to understand what Donald was telling me. It got even worse when he added that although Michael’s exact date of birth was not documented, the adoption papers were signed about three months after I was admitted. He stopped talking and just looked at me.
‘He is your son,’ he said, after a long silence. ‘Our ... son.’
“I didn’t know whether to laugh or cry, I still don’t. Donald admitted it’s mostly circumstantial evidence and even the blood tests are only about 85% certain, but he just knows Michael is our son, and he has known it from the first time he laid eyes on him. My stomach tightened and I was feeling sick as Donald’s words sank in.
“I stared at the wall, hoping Donald was wrong somehow, when I glanced at the wedding picture. I knew Donald was right, Michael’s eyes are the same. The same as my brother’s and the same as the son I had to give up.”
“Fuck me,” I sighed after I finished reading.
“Do you realize what this means?” she asked.
I nodded, slowly. “Dad is Mom’s brother.”
“Can you imagine ... Mom and Dad, brother and sister ... just like Nan and Donald?” Audrey said.
“And us,” I added.
“And us,” she repeated.
I downed the glass of scotch and took a moment to digest the news.
“So, that makes us ... cousins?” I asked.
“And second cousins too,”
“What the hell is wrong with our family?”
“Who knows,” she said as she sat down next to me and lay her head on my shoulder. “What do we do now?”
One thing was clear. This wasn’t going to change anything between Audrey and me. I still loved her and still wanted her. Facing our parents would be another thing.
“There’s nothing we have to do, baby,” I said, holding her hand. Slowly, she calmed down a bit.
“Nothing?” she said, thinking. “But what if they find out?”
“They won’t. You and I are the only ones who know the secret. We can keep it a secret.”
“I guess we can do that. Or at least I’ll try.” Then she looked at me. There was doubt and fear in her eyes. “And ... us?”
I pulled her onto my lap and held her in my arms. I kissed her on the forehead and assured her I still felt the same about her. This finally eased her nerves.
“I guess we’ll have to go home soon,” I said after hugging her for a few minutes. “Are you ready to face Mom and Dad?”
“No, but I guess I’ll have to do it sometime,” she said.
“Do you think they know any of this?”
“I don’t think so. I’m beginning to think Mom never read these diaries.”
“But maybe Nan or Donald told them?”
“Not that I’ve read so far.”
“Well, just try to keep a straight face.”
“What if I can’t?”
“Sure, you can, you’re a great actress.”
“I only-”
“You’ll manage ... Hey, I just thought of something.”
“And what’s that?”
“We are second-generation inbred kids ... We should be retards.”
“Hey! Watch who you’re calling a retard, retard,” she said and playfully attacked me. After a little wrestling, she was sitting in my lap, her arm around me. I was glad to see she was smiling again.
We cuddled a little longer, but there wasn’t much time left, so we packed our gear and got ready to go home.
Audrey tossed her bag in the back of the car and got in beside me. As we hit the road, Audrey was reading again. I could never read in a car; I’d be sick in seconds, but she could read for hours. I put a CD in the stereo and listened to a little Pink Floyd while I was driving. Not long after we hit the highway, Audrey turned off the music and read out loud.
“I asked Donald why, if he knew about Michael for six years, he hadn’t said anything. He explained that by the time the investigator got him the proof he needed, Donna was already pregnant. He then kept it a secret because he feared I would tell Donna, and they might split up because of it. By not telling, he wanted to protect me and my – our – family from re-experiencing the nightmares of our own youth.
“I understand Donald’s motives, but I wish he had told me though. I mean, we must have made love over a hundred times, Michael and me. What’s wrong with me? I’ve had sex with my brother, my father, my daughters, and now my son too. Donna and Michael will visit on Friday. I hope I will know what to do by then.”
Audrey stopped talking and read on silently until she saw something worth sharing with me, about half an hour later.
“Now that I know, it is hard to miss the similarities between Donna and Michael. I can’t believe I never noticed! Their eyes are the same, their hair, and lots of other things too. The longer I looked, the more I saw; the way they laugh and tilt their head, ever their fingers look similar.
It was impossible to hide my anxiety from Donna, but I just couldn’t tell her the true grounds for my distress. There were moments when I wanted to, but I just couldn’t do it.
“Of course, then came that time, after a few glasses of wine, that the three of us went upstairs. Maybe it was the wine, but as soon as we were all naked, and Donna was licking my pussy, I felt no more inhibitions. Michael offered me his cock, and I sucked him. I was giving my own son a blowjob, and I enjoyed it, just like I had enjoyed his father’s, years ago. Then, when he got between my legs and started fucking me-”
“Audrey, please. I’ll crash the car if you keep distracting me like this.”
“Sorry,” she giggled. “Just one little bit, then I’ll be quiet, I promise. And don’t worry, this is after they’re done.”
“Donna and I were lying in his arms. The distress had gone, and I was feeling happy. Happy that I found my son at last, and happy for the man he had become.”