[MF][cheating] I came inside my MIL

So in August my wife was away from home; she’s in sales and was travelling to meet some potential new customers. It’s common for us to spend our summer weekends at my wife’s family home and normally the entire family goes along. For various reasons on that Friday evening when I pulled in to the gated gravel driveway it was only my mother-in-law’s car that greeted me.

I took my bag out of my car and put it in one of the rooms upstairs. It’s a beautiful old building with dark wood interiors and lush carpets. It’s fun to sleep in a different room on each visit and just stare at the detailed features – intricate moldings and ornate sconces and gorgeous furniture – and wonder at the amount of craftsmanship that went in to them. All the bedrooms lead out into the main hallway and I chose one at the far end.

After unpacking I went downstairs. It’s pretty typical for evenings at the house to be spent drinking, talking and cooking (in that order) and this evening was no exception. By the time my MIL and I had dinner I was already pretty drunk. I don’t remember everything that happened but a couple memories stand out. First, I remember my MIL asking if I would put up some shelves in her bedroom. I agreed to help and remember her making a bad joke about needing firm hands and a heavy tool. We’d locked eyes and laughed before right on drinking more. This kind of stuff is not unusual. We make saucy little quips about each other all the time. I’ve always appreciated the cheeky sexual tension in our friendship and I know that she really loves my being hands-on around her house.

The second thing I recall from that Friday night: I don’t remember exactly how I made it to my room but I have this image burnt into my mind of MIL stopping in my bedroom doorway to say goodnight. She was holding a glass of water. I was undressed down to my boxers and about to get in to bed. She was in a night gown that had this sheen to it. I could’ve sworn, in the dim light of the lamp beside my bed, that the gown was open at the front. I have a distinct recollection of the ties of the gown hanging at her side and, while we were talking about plans for the next day, I caught myself staring intently at the crop of hair between her legs. And I also think I remember her looking at me like she didn’t mind that at all. I think
she might have been staring at me as well. I have this impression that she came and sat next to me on the bed but no memories after that. I woke up naked in the morning with my boxershorts on the floor in the far corner of the room. I don’t remember how they got there.

I should probably describe a little of what my MIL looks like. To be frank, she looks just like my wife. They’re both shorties, 5’3 at most, brunettes, perfectly shaped and they’re both absolutely gorgeous. My MIL has deeper set features, a wrinkle here and there, and lines of gray running through her hair. All of those things really contribute to her beauty. I’m kind of a butt man and she has a really nicely defined ass; not huge but delightfully round. The same is likewise true for the rest of her body: everything’s beautifully proportioned and pleasingly curved. I’d never thought of my MIL in that way but I sort of knew I was on to a good thing when my wife introduced me to her. I remember thinking that if my wife ages anywhere near as gracefully then I was going to be a very content old man.

Anyway, as I said, I woke up next morning completely naked. My bedroom door was wide open and I had intense morning wood. I was a little embarassed but mostly kinda curious about how I went from sitting next to her on the mattress to being stark naked with my shorts on the other side of the room. I’d woken up laying on my back at the edge of the bed with my legs hanging over the side and my hands resting behind my head. I don’t lay like that unless I’m really pleased with myself or my cock is in someone’s mouth and
they’re giving me a really good blowjob. There was a spilled glass of water on the floor at my feet that I assume was hers. I still don’t really know what happened so I haven’t beaten myself up too much about it. But my best guess is our friendly “sexual tension” boiled over and I fell asleep while she was giving me head.

I grabbed tylenol from my bag and shut the door, then spent an hour in bed letting the painkiller do its work. The hangover slowly dissipated. Around 7, from down the hall, I heard my MIL getting up and dressed. About ten minutes later I heard what sounded like an electric drill driving a bunch of screws and stalling. Pulling
on some fresh underwear and my jeans I opened the door and saw her screwing a shelf bracket into the plaster just inside her bedroom door. She heard me approach and cheekily told me to get my heavy tool out and start helping.

I moved in closer to get a better look at what she was working on. As I got near she stood up to admire her handy work. Her gaze was moving from the bottom brace up to the first shelf and then as she looked at the top-most shelf she took a step back for a better perspective. She was standing right in front of me, facing away and looking up at the shelf. Our bodies were in contact. She was up against my morning wood. In my rush to see what was going
on I’d just pushed it to one side when I put on my jeans. She didn’t say anything. She just stood there poised against it, looking up at the shelf. For a second, through a bleary-eyed horny autopilot, I pressed into her, grinding through my jeans into her back. Again it was only a second before I caught myself but I immediately felt that same pressure going the other way. She’d followed my lead and was rolling her hips backwards into my crotch. Neither of us pulled away. For a while we just stood there pressing against one another.

It must’ve only been about thirty seconds but we were really grinding into each other. Both our mouths were open forming silent “O”‘s and we were both totally transfixed in our contact. Her behind was kneading my hard on through our clothes and my hands were on her hips pulling her against me.

By this point I was wide awake and a bit lost in the moment. Hell I was really fucking turned on. I slipped my thumbs under the elasticated band of whatever athleisure spandex things she was wearing. I pinched the band and dragged it, along with the underwear beneath, down around her knees. Her buttocks were exposed, white and pale and round. In the cold early morning light I could see the small bumps of goose flesh forming over the
curves of her cheeks. It struck me that her ass looks now like my wife’s will in twenty years. It was absolutely beautiful. I lost it. Heat ran through me. I kinda knew at this point there was no turning back.

She was still grinding against the bulge in my pants.

I unbuckled my belt, unzipped my jeans and rolled them down my thighs. I pulled my dick up over the band of my boxer shorts and took a moment to enjoy the scene: my MIL bent forward in front of me with her hands on the shelves in front of her, her leggings pulled down to her knees, her hips pushed back and her bare behind just fractions of an inch from my erection that was twitching like it was ready to pop at the slightest touch. I gripped my shaft and watched her watching me as I slapped my erection’s thick head against her ass cheek once, twice, three times.

Silently except for the creak of a floor board I bent my knees, still holding my shaft, and lowered myself until the head of my cock was pointed straight up at the narrow slit of her cunt. I pushed my hips forward and up. Resistance at first, but i felt a little give and moisture on my tip. I pulled back barely an inch and tried again. I remember we both breathed in, short and sharp, and she
made the slightest, softest “unh” in her throat. My hips remained still for a second and then I was moving in again. Her hand was on my pubis and she pushed back on me – she didn’t want it too deep yet. I pulled out most of the way before giving a shallow thrust, then a second and a third and a fourth and… Gently, tentatively, silently, we were fucking.

It didn’t take long for this gentle screw to become hard sex. Barely a few seconds passed before each push by me was met by her more firmly rocking back, taking it all in. The wetness I’d felt on first entering her spread along the full length of my cock and mixed in to my pubic hair, and from there to her buttocks as they slapped back against me. Some of it was white but mostly it was clear. It was slick and hot and the sight of it all blended together with the smell of our sex and the sound of our breathing and made me feel animal.

We were still being as quiet as we could but were both panting pretty hard. I felt sweat starting to form on my brow and neck. My pecs were bulging because my arms were outstretched and taut as I was yanking her rear into me. I remember her arm reaching back, her fingertips switching variously from running through my short pubic hair, to pushing at my pelvis in counterpoint to my thrusts, to squeezing the base of my hard penis, seemingly trying to pull herself further on to it. I became fixated watching my erection as it moved into her, her cunt parting and sliding over it. I was rushing towards the edge. My prick felt heavier and thicker and hotter. I was
fucking her with all the strength I could exert. I bent forward and kissed the nape of her neck. I bit her shoulder. I felt the satisfying crest of an orgasm. I ejaculated. My cum spat into my mother-in-law’s body. I tried to subdue my groan but I couldn’t. Each time my cock swelled and spurted semen my spine tingled and my brain exploded and I saw fucking fireworks.

As the wave receded I gradually slowed down and let my hands rest at her hips. Her fingers that had previously been so fiercely clenched around my cock were now tracing soft patterns on my thigh with their nails. I gently slapped her ass and massaged her buttocks, sliding myself in and out of her slowly. I didnt really want to leave her. I massaged her coccyx and lower back. I kissed her
shoulders. We were both quietly giggling in that post-coital satisfied way, like we’d gotten away with something naughty together. I finally pulled out of her completely. A few drips of cum fell onto the floorboards before I was able to lift my underwear’s band up over my dick and pull up my jeans. She slowly stood upright from her bent pose, pulling up her leggings. I saw that she was flushed red at her neck line and in her cheeks. She didn’t turn to me or acknowledge me at all. She stepped inside her bedroom and shut the door behind her. I went back to my room and texted my wife to ask how she was doing.

I’m certainly feeling guilty. I don’t regret it at all but I know that finding out would really hurt her whole family. My MIL and I hung out more over that weekend but we both treated it like nothing had happened. This was, I guess, practice for the coming weekends with the rest of the family. The event just sort of disappeared. I questioned for a while whether it was just an intense dream fueled by all the alcohol that night. But our friendly sexual tension started taking on a different quality. The jokes sounded the same to everyone else but alluded to things we liked about each other’s bodies or to the things we’d done together. If she was feeling down I’d jokingly tell her atleast she had a sweet ass, or she’d goofily grip a banana and give me a big smile telling me it reminded her of something. It’s been an incredibly sexy, incredibly addictive, and incredibly dangerous secret to share with her. As a couple
months went by our flirting got progressively more explicit. It ended up boiling over again in November. This post is already way too long to go into that but it was good to finally get this out of my system.

Source: reddit.com/r/gonewildstories/comments/acnkvq/mfcheating_i_came_inside_my_mil