Surprised by [M]y new flatmates sister [F]

About a month ago I got a new flatmate to live in the second bedroom in my apartment, I had been living by myself for a few months (I really like my own space) but decided to ease the pressure with mortgage, bills etc that I would get someone to fill the room. I advertised the room and pretty quickly had applicants. I quickly settled on Stef (*name changed), she was around my age at 27, had a good job at a law firm and seemed really quiet and nice when we met. Stef is one of those pleasantly attractive people that just always seems to look nice, she has a natural smile and always dresses very neat. She is softly spoken and wouldnt hurt a fly!

Two weeks after Stef had moved in, her younger sister was in town and of course come over to visit. Sasha is 21, and while sharing some of the same traits as Stef, she is also completely different. She has the same natural smile and softly spoken as Stef but thats where it ends. While Stef dresses relatively conservatively (albeit extremely nice), Sasha dresses to impress. The first day I met her she was wearing tight highwaisted black jeans, and a see through black top with a small bra underneath, completely showing off her body.

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For clarification, Sasha is about average height with shoulder length wavy blonde hair, and a typical 21yr old body that is really naturally fit. It is one of those bodies that she doesnt have to work much for, but is blessed. A small waist, with a perky & round booty that has that nice little wiggle when she walks, and maybe D cup tits that she even tries to accentuate more with the use of pushups bras and low cut tops. She knows she has a banging body and in true millennial fashion loves to show it off. Her look reminds me of a tiktok girl with thousands of followers that are there to just check her out, and watch her shake her booty. In saying all that, at first Sashas personality is in complete contrast with her look. She comes across as quiet and nice (just like her sister), but there is some underlying cheeky side to her.

Sasha normally lives in a different city, about 5 hours drive away, but she was staying for a week. However she was staying with some other friends of hers in the city, and not Stef, as Stef thought it inconsiderate to have a guest over for a week after only just moving in (for the record, I wouldnt have cared). Sasha was come over a few days in a row to visit, and because I am working from home I was always around. Stef unfortunately has to go to the office quite often so the visits are usually when she is home from work.

Now, one afternoon I had stopped working early and gone for a run, I had just got home and taken a shower. Thinking I had an hour or so until Stef was home I casually exited the bathroom naked and headed towards my bedroom. I was wandering in my own world when suddenly out of nowhere someone shouts out ‘HEY’. I stop in my tracks, look over in shock at the couch to find Sasha sitting there on the couch. Standing completely naked and probably like a deer in the headlights, I quickly throw my hands in front of my package and apologise saying I didnt know anyone was home. Sasha explained saying Stef had lent her the key so they could meet here after work, I had not answered the door, so she had let herself in. In my surprised state this conversation all took place while I was walking through the living room right in front of Sasha to find something to cover up with. Sasha was sitting really relaxed on the couch, smiling and almost acting as though I wasnt naked. After having a bit of a laugh about the whole situation (after I was dressed), there was some mild flirting on both sides but then Stef eventually returned. I didnt give it much thought as a realistic option to push anything forward with Sasha.

However, later that evening after I was already in bed, I get a message via instagram from Sasha. It was just a funny meme about finding the perfect shower temperature, with a message ‘saw this and it made me think of you because of what happened earlier! haha’. I responded making a bit of a joke by apologising about making her have to see me like that. She replied with a wink face, followed by ‘actually it was more than enjoyable viewing for me..’. From that message, things escalated extremely fast. Within about half hour we were almost full on sexting, and she was sending me very provocative snaps of her in her sleeping attire, which was a bra and panties. Before we had gone to sleep I had told her if she still had the key to let herself in tomorrow, and a joke about having to see her shower.

The next morning, low and behold, Sasha knocked on the door (the key had been returned to Stef). She was dressed in tight jeans again, with a cutoff t shirt that showed off her belly, and clearly wearing no bra as her nipples were visible through the white cotton material. As soon as the door was closed behind her, I had her pushed up against the wall, making out. I almost immediately pulled her top over her head, exposing her tits, with pink nipples and so perky. Within minutes I had Sasha stripped down to her tiny black g string, and I was in my underwear. Playfully I span Sasha around and spanked her, she looked back at me with a look that could only be described as devil-ish. I guided her towards the bathroom, considering taking a shower together. But by the time we got in front of the bathroom cabinet/mirror I couldnt help myself. I pushed Sasha forward against it and got behind her. Her ass was even more impressive than I had expected, full and juicy yet perky. I gave her a couple of hard spanks, and she let out some little squeal/moans.

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After a considerable amount of foreplay using my hands, Sasha was dripping wet and moaning. Her voice had suddenly gotten much higher pitched and she was starting to talk dirty to me. Next thing I remember is Sasha moaning while I fucked her from behind in front of the mirror. Hard and fast thrusts were making her ass cheeks jiggle and her tits bounce a little in the mirror. When I reached forward and pulled on Sashas hair, she let out a long moan and started calling me daddy. Begging me to fuck her tight pussy harder and harder. I completely obliged, going as hard as I possibly could. I pulled Sasha back by her hair and put my hand around her throat gently. This made her exclaim ‘choke me, I am about to cum on your cock’. I squeezed tightly and true to her word, she started gasping while her legs shook, having a hard orgasm. This nearly sent me over the edge, but what Sasha did next completely did. After her orgasm finished, she spun around dropped straight to her knees, taking my cock in her mouth. She looked up at me, asking if I wanted to cum all over her face. I a few long deep sucks further and I was covering her face in an enormous load. She was under my cock, tongue out, and milking every last drop out. It was a sight to behold.

After we cleaned up a little, we ended up fucking twice more. Just as intense and even rougher than the first. I couldnt believe that this was the younger sister of the quiet, nice new flatmate. Sasha told me that it had to be a secret and not to tell Stef, I had to agree. Unfortunately the next day Sasha had to go back home so we didnt get the chance to repeat it. However, whenever Sasha is horny she snaps me the most outrageous nudes. All different positions and angles, and once we are sexting she will show me snaps of her with her toys. If only Stef knew what I did to Sasha in the apartment that day, and the type of content that Sasha sends me now! I assume it will eventually fade out, but its damn hot for now!

Source: reddit.com/r/gonewildstories/comments/m21r05/surprised_by_my_new_flatmates_sister_f