[MF] How I [21M] spied on my stepsister’s [18F] masturbation session

This’s happened some time ago and was the start of Katie and I’s adventures.

I’d always loved my family very much. Ever since my mother divorced my scumbag of a father it had been pretty rough. We barely got by but little by little, we managed.

Honestly, it wasn’t the happiest time of my life. I’d be bullied for looking poor and wearing the same clothes repeatedly and it didn’t particularly help I had always been tall but very scrawny. To this day I am very lanky and basically all limbs but I’d learned it had its perks. It’s always the tall skinny guys packing, I’d read on the internet multiple times, and you know what, not to toot my own horn too much, but I guess I was proof of that.

Anyways, everything changed when I finished high school, my mother got in a relationship with some new guy with a daughter from previous marriage, and we moved in with them, ending a sad but very learning part of my life.

As suspicious as I was of the new guy and as protective as I was of my mother I had to say it was all unjustified. The new guy, John let’s call him, would become a great friend to me and a kind support to my mother. He was a sous chef at a local Italian restaurant and made some of the best food I’d ever tried. I inspire to one day be able to cook for my own family like that.

Money was still a bit of an issue, John not making much and my mother, always in between jobs, not really bringing home the bacon either. On top of that I just started university and the amount of course work that dropped of me really prevented me from getting any meaningful job. I picked up some weekend work when I could, aka when exams weren’t beating my ass and forcing me to study day and night.

We got by though. When you have a loving family that you know you can return to and you know they’ll support you no matter what, things are easier even in the darkest of times.

Let’s talk about my step sister though. At first, when my parents first started dating, I remember us being very apprehensive of one another. There wasn’t a huge age gap but obviously we both had our reasons to be not trusting, and we went on not really interacting with each other, even after my mother and I moved in with them permanently. There was no animosity at all but I guess we both had our own things to do and never really paid much mind to the other person.

Opposite to what I went though in high school, Katie was always very popular. She was pretty, opinionated, and funny. She was always fascinated with makeup and fashion and it really made her shine when it comes to appearance. I’d always wondered where she got the money for all the clothes and cosmetics and she told me once that the thrift store had been her second home. I guess that made sense.

She was always on her phone, popping off on social media, and was basically the stereotypical teenage girl you can probably easily imagine. Long dark blonde hair, big blue eyes, and a petit figure always accentuated by what she wore.

Couple years went by, I was on my 3rd university year. Katie turned 18 a few months back. To celebrate, she went for a sleepover at her girlfriends and returned the next morning. If you ask me (and judging from her Instagram feed) she went partying then and had *a lot* of fun. It wasn’t really my thing to be judgemental but I was a bit jealous. She had been living her best life. Partying, drinking alcohol, and god knows what else while my 18th birthday consisted of my mother and I getting McDonald’s and watching some shitty cable movies.

But anyway, let’s get to the spicy stuff, huh?

It all happened one hot Spring Monday. Both my parents were at work and I was supposed to be at uni, grinding my way through the last year of my education. Katie had been sick throughout the week before and she got doctor’s leave that let her stay home for almost two weeks. I’d shake my head and call her a slacker every time I saw her and all she did in return was pretend to cough and act very miserable and sickly to my face. Little shit.

To my surprise, that day, one professor had some kinda accident on the way to work and had to last minute call off the three hour lecture we had planned. I did a happy dance in my head, said bye to my friends, and went home.

When I got there, I tried to be as quiet as possible. See, Katie was supposed to be resting in bed but I knew for a fact she’d be on her laptop, probably blasting music and having the time of her life home alone. I wanted to catch her red handed and had my ‘A-HA!’ moment when I saw her out of bed.

Well. To my utmost surprise she was indeed in bed.

Wet handed.

Head down on the pillow, ass up on her knees, plunging two slender fingers into one of the prettiest pussies I’d seen in my life.

I was floored. Standing there like a statue, Jaw dropped to the floor. I don’t know how I managed to not drop my schol bag I was holding then.

I couldn’t believe the door to her room was half opened and giving me the perfect view at her peach shaped ass in the air, trembling slightly each time she put fingers inside her little pink pussy.

After what seemed like eternity but in reality was probably five seconds I managed to glue my eyes off her and, as quietly as I could, walked back down the stairs and out of the house.

At least that’s what I planned on doing. My dick was rock hard in my jeans, rubbing uncomfortably against the fabric of my boxers. I looked down at the impressive bulge in my pants and swallowed as I turned around and walked back to her room.

Even without visuals I could hear her very little, muffled moans and even managed to pick up wet noises her fingers were making.

Her pussy must have been thoroughly drenched. Clenching around her fingers in soft, slick shackles.

I braved a peek and saw her in the exact same position. I noticed she had earphones in her ears and was obliviously listening to something. I wondered what that was. Her small breasts weren’t really visible so my gaze quickly went back to the grand prize.

And, indeed, she was totally drenched. I could make out wet spots on the white bed sheet, below where her ass was shaking in pleasure in the air.

I didn’t dare to move, my cock trapped painfully in my tight jeans, begging to be touched. At one point, she pulled both fingers out leaving her pink flower slightly gaped and I swear I almost cummed right then and there, witnessing that perfect pussy in its whole glory. She began abusing her clit and rubbing on it fast.

I was mesmerised. I don’t think I blinked for the entirety of that time. I could not move away, I could not stop looking. It was wrong, all of it. She was my sister. She was family. But at that point, I didn’t care. Some primal instincts took over. Her pussy was so perfect and beautiful I swear you’d all be in the same position if you were me.

Maybe thirty seconds had passed and she started to shift. She rose on one elbow and… that was enough to had me scramble back. I immediately moved away and rushed downstairs making sure I was being as quiet as a mouse.

By then my erection was gone. My excitement was gone. All I felt was panic. I was mortified. I just witnessed Katie finger herself. Why didn’t she close the door to her room? Was she trying to get caught? Questions and worries were flying through my mind as I exited the house and stood on the front porch thinking what to do next.

An old woman neighbour walked by with her tiny chihuahua on a leash. She looked at me, we exchanged greetings. She walked past. Immediately, I looked down but thankfully the bulge was all gone, scared away by the absolute mortification of what I’d realised I’d just done.

After a little bit, I went home, slammed the door loudly and yelled ‘I am home’, just to be sure. I sat at the kitchen table, uni bag still clenched in my hand. Images of her naked slender figure assaulting my mind one after another.

It took maybe a minute for her to run downstairs like nothing has ever happened. She was as bubbly and talkative as ever. Any sign of flushed skin covered by the fact that she was supposedly sick and bed ridden. I looked her up and down, careful to be as casual as I possibly could. Baggy joggers and some nondescript black tank top. Nothing out of ordinary.

I explained why I am back home early and we had breakfast together.

An hour later, I jerked off in the shower thinking about sucking on my stepsister’s pussy and drinking her sweet juices. I came harder than I’d ever come.

^(I hope you enjoyed that! Sorry for any grammatical errors. English is not my first language. Second part coming soon. Feel free to pm me with any questions. Cheers!)

Source: reddit.com/r/gonewildstories/comments/h7krnu/mf_how_i_21m_spied_on_my_stepsisters_18f