Mom held my hand walking up the stairs, my uncle, with his strong hands on my shoulders. My heart was pounding through my chest. Did I want this? My head told me, no, but my raging erection told me otherwise.

We reached the door to the bedroom, and I panicked. I turned away to leave.

“Whoa, where you going, champ?” Mark said, grabbing me by the arms.

“Oh, no. You can’t back out now, young man!” my mom said in her usual stern voice.

She opened the door for Mark to virtually carry me into the room. He lumped me onto the chair facing the bed (the same angle I placed the hidden camera). Mark quickly slipped out of his clothes and leaped onto the bed, while mom removed her pants and made a sultry walk to the bed.

Mark knelt behind her and helped peel off her sleeveless turtleneck. She wasn’t wearing a bra, so her D cups popped out from underneath. Mark then placed his hand inside her panties, and she gave out a little moan.

"Mmm, you're so naughty, Mark!" Mom purred.

"Only naughty for you, Susan," Mark replied.

My mind was spinning. 'This can’t be happening.' I thought to myself. 'It's adultery. It's incest!'

Even so, I remained still, erection pressing against my pants. Even the way they spoke their names to each other was hot.

Mark took off mom’s panties and gave her vagina bush a little tap. He then grabbed her arms the same way he carried me into the room and pushed her onto her back. He rubbed his enormous penis against her bush, mom licking her lips, then he penetrated mom’s vagina to the point his own pubes were in friction against hers.

“Ooooh!” mom moaned.

Mark’s rhythm sped up, placing his hands under her buttocks and lifting her off the bed, causing the bed to rock. Mom supported herself by clutching the headboard. I squirmed in my seat, pondering whether I should rush out the door in embarrassment.

They changed positions. This time in the reverse cowgirl position. Facing me. Mark’s balls slapped against my mom’s vagina. I looked at mom in the face. She was looking at me with a sly grin on her face. I turned away in shame.

“Daniel! You’re supposed to be learning here!” she bellowed.

I turned my head back. Mark’s huge penis accidentally popped out and a speck of pre-cum landed on my arm. Both mom and Mark laughed.

Mark sat up on the edge of the bed and mom slid off his penis. They had a sudden make-out session making pleasurable moans. Mom gave Mark a hand-job, her marriage ring and gold wristwatch blurring from the motion. Mark was fingering mom and playing with her bush, causing her to shiver.

Mark stood up, his penis inches from my face. Mom looked up at him lovingly, a look she had never given dad. Her hand gently caressed his arm, then he pulled her up. The couple, pretty much standing over me were in a passionate embrace. Then out of nowhere, Mark grabbed her buttocks and lifted her off the ground. Mom’s leg narrowly missed my face.

“Haha, sorry sweetie!” mom told me.

He carried her to the other side of the room and fucked her standing up. Mom looked almost petite against Mark's muscular frame.

“Oh, god, Mark! Yes! Yessssssss!” mom squealed in delight. Her boobs bounced and chain necklace swayed from side to side.

"You like it, Susan?" Mark smirked.

"Oh, Marrrk! Barry could... NEVER do this!"

Mom saying "Mark" in such a sultry way made my penis ache. I needed to release it from my pants. I momentarily hesitated, then I pulled down my pants.

I quickly regretted it, as they saw me grabbing my penis. Mom hopped off Mark’s penis and stormed across the bedroom to me. Her hands on her hips.

“Disgusting young man. Who said you could masturbate?” mom sternly said.

“I... uh...” I stammered.

“Oh Susan, let him this one time, dear.” Mark intervened. “He’s a growing man after all!”

'Growing man?' I thought. 'I’m twenty-eight.'

Mom turned to look at Mark, who was climbing onto the bed, then back to me. Her stern face softened.

“Ok, fine. Just this once!” mom said while ruffling my hair.

Mom joined Mark on the bed and gave him a blowjob. Mark let out a moan and ran his hand through mom’s short, mousy blonde hair. His other hand rubbing mom's bushy vagina.

After a short while, mom raised her head, leaving a loud ‘pop’.

“I want your cum inside my pussy!” mom purred to Mark.

I had never heard mom sound so dirty! It was almost as dirty as her cheating on dad with her own brother.

Mom propped herself up onto the headboard, her arms outstretched. Mark shoved his penis inside her and sawed in and out. The strict, frigid mother who had raised me, was enjoying her own brother's penis. Her eyes rolled up and her mouth widened. She was in ecstasy!

Mark was close to climaxing.

“Ready, Susan?” Mark breathed.

“Yess! Do it, sweetheart!” she screamed! 

Mark came inside mom, both of them making loud noises which echoed throughout the room.

I ejaculated as well, a few moments after Mark.

Mark’s penis slowly left mom’s vagina, leaving a trail of white semen.

“Mark… Wow!” mom exclaimed.

“Just giving my girlfriend what she's been missing for twenty-nine years,” Mark said, in a snide remark about my dad.

Mom gave a, "Whew!" while wiping the sweat off her forehead. 

They got into a cuddling position, mom's leg leaning over Mark and brushing against his penis, Mark stroking her backside.

“You know, I think we’d make some gorgeous kids!” mom said with a huge smile, stroking his chiselled hairy chest.

It only occurred to me just now: could mom still get pregnant at her age?

"Course they would be, Susan. They'd have a stud for a father!" Mark said.

Mom let out another purr of delight, then kissed him again.

They eventually looked over at me.

“Daniel! We’d almost forgotten you were here!” she said.

“How's that for 'sex education' champ?” Mark asked.

I was speechless.

They laughed together at my response and kissed for a short time longer. They whispered something I couldn't hear, and they got up.

“We’re going to take a shower now,” mom said. “Afterwards we’ll cook up a nice meal.”

They walked out of the room, arms around each other as lovers.

My heart was beating rapidly. I had literally just witnessed my mom and uncle have incest sex in the flesh. Incest sex in mom and dad’s marital bed.

'Dad,' I thought. He was none the wiser.

I felt dizzy. I mean, how many guys get to experience something like this? I shakily got up and walked to my bedroom. I heard the sound of laughter from the bathroom.

It was late evening, and I heard my mom call me down for dinner. It only just occurred to me that I had been sitting upright on my bed in the dark, for over an hour. My mind was still swimming. I pulled myself together and joined my mom and uncle at the dinner table.

Mom was wearing a revealing camisole, my uncle wearing a vest which highlighted his muscles, as well as his Rolex watch. That was dad's anniversary gift from mom!

'How dare he?' I thought.

I almost called him out for it, but for whatever the reason I didn’t speak up.

We ate in silence, mom and Mark holding hands and exchanging loving glances at each other. 

“I’m finished,” I said, wanting to leave and never come out of my room again.

“Sweetie, Mark and I brought a movie for us to watch tonight. Sit with us!”

“Nah, I ought to-“

Mom gave me the stern look she always gives, so I stayed with them.

We sat on the living room sofa watching a rom-com. Mom and Mark cuddled up on the sofa, occasionally kissing and lifting Mark's vest to caress his abs. I tried my hardest to focus on the movie, yet I felt my erection grow several times. In my peripheral vision, I saw the usual golden glow of mom's watch vanish into Mark's pants. Maybe absent-mindedly or not, she was playing with his penis.

Once over, I said my goodnights and went to my room. A short time later I heard them come upstairs. I peeked outside my door one last time. Both were fully naked, with their clothes in a trail across the floor. Mom was clutching Mark's penis towards the bedroom, and they left the door slightly open. I heard them having sex again, but this time they sounded softer, much more sensual than what I witnessed. I lay in silence, heart pounding.

I briefly fell asleep and woke up from a wet dream involving mom and Mark, and tiptoed my way to the bathroom to clean up. I stopped to look in my parent's room. Mom was propped up, naked and with her eyes closed, wrapped in my uncle's strong arms. Her usual stern expression looked content. Mark was looking down at her, caressing her breasts as her necklace shined in the moonlight. Mom lifted her hand to bring Mark's head closer and gave him a tender kiss.

She whispered, "I love you," to Mark. It made me reconsider my feelings. Yes, they were siblings having an affair, but they were also two middle-aged people who were clearly in love. Mark looked up and saw me. He put his finger to his lips, implying that they didn't want to be disturbed. I weakly nodded and carried on to the bathroom.

The next day had almost returned to normal, at least when the two of them were at work. During my alone time, I could barely concentrate. I kept repeating the same events over and over. In a short amount of time, I had witnessed the ultimate sin, and it all began just because I wanted to see mom masturbate on webcam. 'What an utter fool,' I thought.

Mark stayed over again that night. I kept my distance from both of them, leaving my room only to sit with them at the dinner table.

Dad unexpectedly returned the next day to surprise us, much to my mom's dismay. It was lucky Mark was working, so mom was able to tell him not to return that evening. Mom quickly popped out to return Mark's belongings when she "forgot" something at work. Other than that, it truly was as though nothing had happened.

Mom was back to her stern old self. Dad asked mom what happened to his Rolex, and mom gave me a “Don’t you dare say anything” look. I wanted to tell him; I really did. But, like what mom said, it would destroy him.

Mom and Mark still sent naughty texts to each other, mom telling dad it was her friend Julie from work if he ever asked.

Out of the blue one evening, mom told me she had something important to tell Mark, and to keep my dad company while she phoned him. Dad sat there blissfully unaware, watching the television.

The next morning after dad had left for work, mom opened my bedroom door. 

“Daniel? Are you awake?” she asked.

“What is it, mom?” I asked, sitting up, trying to act casual.

“Mark has booked us a hotel room in a few days.

My heart sunk. They want me to watch them again, using me for their sex kinks.

“Us?” I asked.

Mom sat next to me on the bed.

“No, sweetie, just me and him,” she said calmly. “You see, you watching us together like that was a one-off, and it shouldn’t happen again.”

She placed her hand on my thigh again, feeling her watch and wedding ring on my skin.

“Your uncle and I are in love. And people in love often create miracles. Daniel, last night, I found out that I'm going to have another baby."

I looked at her, in shock.

"I called Mark to tell him the news, and as a celebration, we booked a fancy hotel for the night... Remember when I went out for that meal with Julie? Well, the 'meal' part was true, but it was with Mark. It was such a magical evening. I looked into Mark's eyes and I couldn't see myself with anyone else. By now, it was more than just sex. We mutually agreed there and then that we would start a family together. I drove us back to Mark's place and we had sex with the intention of conceiving. We’ve been trying for a baby for about a month since then." 

Mom continued.

"Before you set up the camera, Mark and I had already had sex in my bed. In fact, we spent more time in my bed than I did Mark's. It was only when I saw the hidden cam did we decide not to do it there for a while, until I had the silly idea of having sex in front of the camera. Once again, I'm sorry you had to see us like that, but you would've found out about Mark and me eventually.”

'Yet you had sex right in front of me the next day,' I thought.

“Anyway,” she continued, “Mark's my boyfriend, and I will be going to the hotel to celebrate our new beginning. When I return, I will divorce your father. Please don’t be angry with me, Daniel. You can’t help who you fall in love with. ”

"Is... Is that why you gave away dad's watch? Because Mark is your boyfriend?" I asked.

"Yes, Daniel. Please don't think I just gave it to him for no reason. It is a sign of love on my part," she said.

Still feeling numb, I just nodded. There was a moment's silence between us until mom spoke up.

 “As... the baby may have “genetic” problems due to myself and Mark being blood-related, as well as being older parents, I’d appreciate it if you help us raise your new sibling.”

Again, I nodded. I was in shock, but I nodded.

Mom hugged me and kissed me on the cheek.

“Thank you, sweetie. Everything’s going to work out fine.”

The fateful evening where mom and Mark went to “celebrate” couldn’t have come any quicker. Dad was told she was going to the hotel with her friends Julie and Trish. They know about mom and Mark. Apparently, they’re very supportive of the whole scenario, because in truth they've always thought my dad was a loser, and Mark was the "stud" she deserved. Makes me wonder what they think of me, considering I'm a carbon copy of my dad. I sat through the night, nervously wondering what they were getting up to.

Mom returned the next day, acting like a giddy teenager. She told us she had a lot of fun with "Julie and Trish". Ordering room service and staying up all night, followed by a relaxing jacuzzi bath. Poor dad seemed genuinely happy for her.

As mom promised, she divorced dad after a few weeks. He was traumatized, wondering what he had done wrong. Twenty-nine years of marriage and all of a sudden, bam, divorce. Mom gave him a half-truth, that she just didn’t love him as much anymore. He now lives on his own in a small apartment, while mom has the house. 

Mark moved in and settled in quickly as “man of the house”, even claiming mom's marital bed as his own. Mom is no longer the "matriarch" now that Mark has taken over, although she still maintains her strict persona. Early into mom's pregnancy the three of us went on a vacation. Some... interesting events happened, but that's a story for another time. But since then, I've gotten into a bad habit of spying on them having sex.

Nine months later, mom gave birth to a healthy baby boy, a relief to all of us. She named him Bradley after Mark’s middle name. As I promised mom, I help with my new brother-cousin. I now have a part-time job working for Mark at his gym. It's not much but it helps towards supporting my little brother. 

I wonder if he’ll grow up knowing that his parents are related...