She Thinks I Don't Know - 1/8

Jacob uncovers a shocking secret.

Mar 01, 2026

Content warning: This story contains Dub-con themes. Please be aware.

I gripped the handful of hair in my fist and pulled my wife’s sister’s head even harder. The increased arch in her back allowed me to force the final two inches of my thick cock into her stretched asshole, virginal no longer.

“Aaaaahhhh, that hurts, Jacob!” she cried out as my hips pressed against her pretty ass.

I slowly pulled out, enjoying her groan when I slammed back into her. I pressed my hips firmly against her tender backside and held there.

“Well, Jennie, leaving aside the fact that we both know you love this, you need to decide if this pain is worse than the pain your husband, family, and friends would feel if they found out your and your sister’s dirty secrets.”

Wait, wait, I’m sorry, I’m getting ahead of myself. It’s just such a great part of the story that I couldn’t control myself. We’ll get there.

This will all make more sense if I start at the beginning.

Which was about 5 years ago when I married Jessica, the love of my life. We started as casual fuckbuddies, but it quickly became apparent that we were connecting in a way neither of us ever had before. It seemed as if we had finally found true love, and we were married within the year. The twins came a year after that.

We were living the idealized happy life. We had fun hanging out together, we co-parented very smoothly, and our sex life was great, very loving and intimate. I did feel that Jessica may have had a hidden kinky side that she would only occasionally reveal, but I was sure I would be able to get her to open up and explore that with me eventually.

After the kids came, I began to notice my wife exhibiting a subtle behavior pattern. My sensual and intimate wife would become more sexually charged. She would want more frequent sex, and wilder sex, too. One time, she pulled me into a bathroom at our friends’ house to give me a blowjob!

But it wasn’t just about the sex. Jessica would also become moodier and more irritable. It seemed like if she wasn’t fucking me, she was angry with me for some reason. It would become quite confusing, especially when she would suddenly revert back to her old ways. My loving wife would reappear, and the surprise blowjobs would go away. Finally, about a year ago, I made the connection about what would trigger her change.

Girl’s Night.

An angry slut would go out, and my affectionate and gentle wife would return.

“What did you get up to last night, baby?” I would always ask my suddenly very cuddly wife. The answer was always the same.

“Jen and I met the girls at the club. We spent the night drinking and dancing. With each other, of course,” she would say, trying to reassure me how innocent it all was.

So, I tried it. Extra date nights with clubbing and dancing were added into our schedule. Jessica always enjoyed herself, and I had hoped these nights were enough to keep her happy. But the night she fucked me in the parking lot of the club after yelling at me in the bar showed me that the cycle remained unchanged. Something else had to be happening on Girl’s Night.

I get it. I should have trusted her, given her space, let her be her. But I had to find out what the trick was to keep my wife in her happy place. Fortunately, the next Girl’s Night was just around the corner.

I spent a few days getting organized and was ready to investigate Girl’s Night. When Jessica left in an Uber, I enacted my plan. My mother came to watch the kids, and I went to “an urgent work meeting”.

I was an asshole, I admit it. I tracked her. An RFID tag in her purse allowed me to avoid messing with her phone, so she would never need to know. I just needed to find the secret, and everything would be great. Or so I thought.

As expected, her Uber first took her to her sister’s house, but when they got on the highway leading out of town, I grew concerned. Staying several miles behind them, I was able to follow them to the city. When the tag finally stopped moving, I waited 10 minutes and went to the location. I was surprised that there wasn’t a nightclub or restaurant, but only what appeared to be an adult store of some kind, The Diamond.

Entering the establishment, I saw the store area was adjacent to a club-like area. I could see the lights and hear the music. Since I didn’t see Jessica or Jennie in the store, I went further back.

I paid a $50 cover for entrance into the club. There were groups of people gathered around a couple of elevated stages. On one stage a young lady danced as she slowly removed her clothes, while on the other a pair of naked women were making out and obviously about to go much further.

I didn’t get much of a chance to watch, however, because that’s when I caught sight of Jennie following Jessica up a flight of stairs in the back of the club. I made my way through the crowd and was able to glimpse them going left down the hallway at the top of the stairs.

I crept up the stairs slowly to avoid running into them on the landing. I reached the top, saw no one, and began to head left when I heard an attendant behind me.

“That side is for sucking. It’s fine if you want to but turn on the pink light so other guys know it’s a man in there.”

I turned to him with a look of surprise. “Um, no, I’m not sucking. Did you see the women who just came up?”

“Oh, you want one of them! I don’t blame you; they were hot. They went into booths 5 and 6. If you go to the right, you’ll see if they are available. If the green light is on, you can go in.”

What the actual fuck?

“No, no, no, no, no,” I muttered as I went to the right and around the corner. I saw the numbered doors and made my way to door 5. The red light was on, and the door was closed. But the light over door 6 was still green.

I couldn’t believe what was happening. I guessed this was some kind of glory hole place and my wife was behind one of these doors. She might be sucking a cock right now! My biggest surprise came when I realized I was as hard as a rock. My dick obviously had different thoughts about this than I did.

I burst into room 6, fully intending to confront my wife and drag her out of here directly to a divorce court, but when I saw the actual glory hole, I was shocked into silence. My cock throbbed in my jeans. I didn’t know what to do.

“Come on, baby, give me what I came here for. Give me your cock,” the woman on the other side said.

Holy crap! That was Jennie!

I don’t know why, but I didn’t want her to look through the hole and see me, so I quickly stepped closer to the wall. Now she could only see my pants.

“Well, get him out then,” I heard her say.

Despite my own intentions and better judgement, my cock and hands seemed to agree with my sister-in-law, because before I realized it, I had opened my pants, and my stiff shaft was through the hole.

I felt the first mouth other than my wife’s on my cock in years and was amazed how good it felt. My sister-in-law sucked me almost violently, not nearly as gentle as Jessica. Jennie also seemed to be able to get more of my cock down her throat than her sister. I had never had a blowjob like this.

The thought that this was my wife’s sister sucking my cock, not even knowing it was me, was inflaming my lust. I couldn’t believe how hard I was.

“Mmmmmm,” I heard Jennie humming around my throbbing cock head lodged deep in her esophagus. I had never felt anything like it. I wondered if Jessica knew that trick.

Holy fuck!

I suddenly remembered that Jessica was in the booth next door, possibly humming on some stranger’s cock. Rather than kill my erection, the idea was just what it took to finish me.

With a grunt, I exploded and shot my cum into my wife’s sister’s mouth. Jennie slurped and slurped, swallowing every drop. I don’t think I ever had an orgasm this powerful. My knees went weak, and I had to lean into the wall to hold myself upright.

“Mmmmmm,” I heard Jennie moaning as she drank down what felt like a gallon of my seed. When I finally finished spraying, she released my still semi-turgid cock with a loud ‘POP’.

“Thanks, honey,” I heard her say, “that was a lot of very tasty cum!”

I dropped my voice an octave so hopefully she wouldn’t recognize me when I answered, “No, thank you. That was great.”

Turning away so Jennie wouldn’t be able to see my face, I rushed out of the booth and closed the door behind me. The red light over door 5 was still lit.

Same guy? Another guy? Fuck! I didn’t even want to think about it. I glanced at my watch and saw I only had 30 minutes before I told my mom I would be back. I would barely make it. Since I needed to process this whirlwind of terrible before I could decide anything, I quickly walked down the hallway, passing a man going the other way. A look over my shoulder and I saw him go into the room I just left.

My mind was spinning. I got the hell out of there.

“Just in time, I was getting worried. Is everything OK at work?”

“It’s just a little stressful right now, but I’ll figure it out. How were the kids?”

“Not a peep all night. They slept the entire time. They won’t even know I was here.”

“Thanks, Mom. And don’t tell Jess, I don’t want her to worry over nothing.”

“Of course, Jacob. I have to get back to your father now.”

It seems like Jacob has some thinking to do. Learn what he decides to do in the next installment!

To be continued —