M/F – How I ended up being FWB with my ex-step sister – Long

Quick disclaimer – English is nor my first language so bear with me.

This story starts almost 15 years ago, and has a bit of a build up.

My mom and dad had recently split up, and my dad started dating a new woman. She had a daughter from a previous relationship that was just a year younger than me. At the time we were just 11 and 10 years old, so nothing sexual happened for a while still. We just quickly became good friends and loved to hang out with each other.

Fast forward 5 years. By now my dad have bought a house with his new gf and they married making us step siblings. Since my dads new house is very close to my moms I would spend much time with them, and over the time became very close with my step sister. At the time we're 15 and 16 years old, and gone from being good friends to being very flirty with each other. Still nothing sexual – my step sister would always have a boyfriend, but she would flirt and tease me mercilessly whenever her bf was not around. It drove my pubescent mind crazy and I spent most of my time in my dads house with a semi in my pants or a raging boner in hand behind a locked bathroom door. I would masturbate every night in bed knowing she was lying just inches away from me on the other side of the wall, and I think she knew what I was doing as the bed was squeaking badly with my rapid hand movement.

There was crazy sexual tension between us, and as I said, she loved to tease me. During the summer when we were 15 and 16 years old we went to Spain for two weeks. Since it only was a two bedroom apartment we stayed in, we had to share our room. She would deliberately wait for me to come into the room before closing the door and changing into her bikini, making sure to give me a show while stripping down. When we went to bed at night she would take of her bra and panties under her blanket and throw it at my face, then proceed to giving me nipple slips or showing her ass while wearing a wicked she-devil blueballing dominatrix smile on her face. She would also tell stories about the sexual exploits she had with her boyfriend and tease me when I got hard.

Fast forward another 3 years. Im 19 and she's 18. By now, I'm out of my shy shell, have had some experience with girls and grown a lot more confident than I was before. Our parents have broken up, so we're not step siblings anymore. She has also just broken up with her boyfriend of the past two years, which also happens to be my best friend. Me and my best friend has planned a trip across the country to watch a concert, and ended up having an extra ticket for the show since a third friend had to cancel on us. Since they're still friends after the break up, we invite my now ex step sister to join in as we knew she loved the band we we're seeing.

It's a 12 hour drive where we're going. I'm driving with my step sister riding shotgun and my lazy ass friend sleeping in the back. She's flirty as always with me, but this time I notice something is different. Her hand is resting an extra second on my thigh after slapping me for something stupid I teased her about. When I was 16 I'd just blush and be completely passive, but with my new found confidence I love flirting. I mockingly do the same slap on her thigh and resting my hand there every time she says something stupid or tease me. I can tell already she's loving it, but nothing more happened until we get to our hostel.

We stay in a cheap ass dorm room hostel, but luckily we get a room by ourselves. There is 5 single beds and one queen size bed which I am quick to call dibs on. We decided to head out for some drinks, but after spending 12 hours in the heat of a car with no AC we decide to get a shower first. Since its a dorm room hostel, there are no bathrooms connected to the rooms. The only shower we find on the fool is a coed shower room with three showers in. We need to share the space where we get undressed, but the showers are separated by glass walls and doors of the blurry kind you cant really see through. As we enter the room, my step sister runs over to the middle one and calls dibs. I've found out later she is kind of an exhibitionist, so I guess it made sense. My friend is a bit more shy and hesitant to shower with us in there, but quickly gets undressed when he see's me and my step sister get naked and step into our designated showers.

Now her teasing steps up a few notches. Not long after the water is on, I see her pressing her boobs up the glass of her shower too show them off to me. By now its been a few years since I last saw them, and they have developed into a nice set of perky c-cups resting on her 5"8 frame of 120lbs. This makes me instantly hard in my shower, so I step over to the glass and press my dick up against the glass to show her what she did to me. I can see her vaguely checking out my completely average package, and using her hand to stroke against the glass on the other side. My god how I was wishing that glass gone. Before we end our little tease in the shower she turns around and presses her ass up against the glass and slowly grind it up and down where my dick is pressing on from the other side. It made me wild with desire and I had to move away from the glass so I wouldn't end up cutting a glory hole with my dick right there I was so hard. As we stepped out of the shower she made sure to give me a full frontal flash of her rocking body before she wrapped it in a towel, which almost led to a really awkward dressing room as I was only in a towel and my friend had no idea about the shenanigans we'd been up too which made it even more exciting.

As the concert wasn't before the next day, we decided to get some food and get to bed early since we left at 7 in the morning from back home. Everywhere we went she continued her teasing. She would use any excuse to touch me, and if my friend was walking ahead of us unable to see she would pinch or slap my ass lightly while looking me dead in the eye. I would always repay her in the same way, or even push it further by moving my hand from her ass and down between her legs. At one time she even had to swallow a small whimper, which to this day I keep in my wank bank. Through the entire dinner she kept me rock hard. She seated her self next to me while my friend sat across the table. She started slowing caressing my thigh, slowly moving up until she was stroking my dick through my jeans for almost a full half hour. I was hurting from being hard or with a semi for most of the day in slim-fit Levis by now, and came very close to blowing my load by the end of dinner. Made holding a conversation hard which made my friend ask what was wrong with me since I usually talk a lot in good company. "Uuhmmmm headache".

Our flirting and teasing continued until we came back to our hostel. I had some problems getting undressed without giving away my fairly obvious boner to my friend, but managed after a while and got in the big bed as they got in they're small ones. Of course I had forgotten to brush my teeth, and I when I got up to do so in the sink in our room, my step sister got up and laid down in my bed. For the sake of my friend not getting suspicious I told her to fuck off, but I could tell by the look in her eyes and mischievous smile that would not happen so I said "I called dibs, so I'm not moving at least" and got in. I laid with my back against her, and she immediately started caressing my thighs and ass while I had a returning problem with an erection. At least this time I could hide it under my blanket.

Teasing stops, sex starts

As I mentioned earlier, my friend is lazy as fuck and was soon snoring. As soon as I heard this rolled over to face her. We were laying face to face and she had that incredible mischievous smile on her face that I wiped of by kissing her right on the lips. She sighed heavily and whispered in my ear that she had been waiting all day for that as I moved my hand from her outer thigh up to her ass and g-string panties. I pulled on them so hard they made a way to loud ripping sound, and we froze for a second to see if my friend would wake up. He probably didn't hear it as he snores at about 9k db, so we had a little giggle as her mischievous smile returned when she lifted her ass up to pull of her panties. She then pulled down mine and started slowly stroking my dick as my hand found its way to her shaved pussy and started gently working her clit. She was so wet it was practically running down her thighs, and she whispered she'd been as such for most of the day before biting my ear lobe. I felt like I was going crazy if I didn't get to feel the warmth of her sweet pussy with my dick soon, so I commanded her to turn over so we were laying in a spooning position. She spit on her hand and rubbed some on my dick and guided me in, and it was the best feeling I've ever had after all those hours of being hard in my pants with no release…

We didn't stay like that for long as she couldn't keep some rather loud moans from escaping, even though I was holding her mouth with my hand to keep her from getting too vocal. We grabbed out underwear and walked naked across the room and into the hallway of the shitty, almost empty hostel, and found the stairwell. I took position on the platform between to floors as she got on her knees a few stairs above, and I gave her a spank hard enough to leave a red mark on her ass. By now she was almost wet and sticky the entire length between her legs and knees and begging me to fuck her hard. So I did. I had one hand grabbing her hard by the ass and the other grabbing a fistful of her hair pulling her head backwards as I fucked her as fast and hard I could with the size my genes provided me with as she was moaning loud and furiously working over her clit with one hand. Because of the 12 hour build up for this, neither of us lasted long. She came within 2 minutes and where her orgasm left, my started. I usually dont shoot ropes of cum unless I'm extremely horny, but this night I blew on over her ass and lower back before the rest more like spilled out of my dick and onto the floor… Which had wall to wall carpet, good luck cleaning that up.

We didn't have sex again during the trip, but would make out furiously whenever my friend went to the bathroom or took a shower. It did turn out to be my best FWB-relationship though, and continued for another 6 months or so until she confessed she had feelings for me and wanted more. She was a good lay and sexy as hell, but her crazy-hot scale wasn't really matching up so I ended it (she was very hot but even more crazy and VERY controlling, I can't stand that in a GF).

Have some more stories of her if this one was enjoyable.

Source: reddit.com/r/gonewildstories/comments/36m43x/mf_how_i_ended_up_being_fwb_with_my_exstep_sister