Almost 17 years.

My wife's baby sister and I say baby because she is 13 years younger and looks nothing like her, My wife is short and cute, Her sister is tall and skinny and annoying as FUUUUCK, Her only redeeming quality's her sister has is massive tits and a nice pussy, On my wife's 33rd birthday we were at a large outdoor concert that takes place every year on her birthday, It was the first year her sister had attended with us so she was sticking pretty close.
We had been drinking steadily since the afternoon and were pretty drunk by whatever time it was and her sister had decided she needed to go back to our camper for a little lay down, LOL. My wife had 5 other friends there so she asked me if I would walk her sister back since it was a long walk and she was pretty drunk and she was a bit afraid to go alone, I agreed and we headed off, There are about 10 different sections for camping and we were 3 sections away, Before leaving she used the portable washrooms and then we headed off, By the time we got half way through the second section she had to pee again, There were no bathrooms so she had decided to squat, She found a spot between two trucks and looked around, She peeled her panties off from under her skirt and hung them on the radio antenna of the truck.
She was giggling away and looking around, She said "keep six" so I looked around, I said "You're good", I was looking away but when I heard the pee hitting the ground I turned around and looked, She was squatted leaning against the truck tire, Legs spread with her feet as wide apart as she could get them. With the stadium lights, Campers and vehicles and the few scattered street lights it was actually very well lit, I looked and could see everything, She was holding her skirt and looking down as I stared right at her pussy, She looked up and caught me and said "Hey....Psssst...Hey", I giggled and said "Sorry but..." and she said "If you're sorry stop looking", She tilted her head to the side and scowled then said "Fine, Hand me my panties", I took them off the antenna and handed them to her, She used them to wipe then tossed them under the truck, Stood up and pulled her skirt down.
We walked back to the camper and she asked if I was going to go back to the concert, I said "Nah, I'm gonna start a fire and sit here", She asked if she could join me for a night cap and I said sure, I started the fire and she went inside to get us some drinks, We sat down and she said "I am sure I don't have to say this but...Let's not tell my sister that you watched me pee", I agreed and we laughed, She said "Well...That's the first time anyone has ever watched me pee", I said "It's the first time I ever watched anyone pee", We giggled and she shook her head, I shrugged and said "Sorry, I just couldn't look away, Your pussy is beautiful", She tilted her head and said "No, No it's not", I squinted and said "Oh absolutely it is", She scowled and said "I don't like it", I shrugged.
I was about half done my drink and she said "Well, I have to pee again, Wanna watch?" and laughed, I blurted out "Yes", She laughed and said "What??", I shrugged and she shrugged and said "Alright", I said "Hold on", I checked my wife's location and she was still at the concert, She said "Where?", I said "Behind the camper?", She shrugged and said "Go grab some toilet paper", I bolted into the camper and back and then we snuck behind the camper, Luckily we were on the outside row so no one was behind us, I pulled out my phone and she said "Whoa, Whoa, No pictures", I said "Just for a light?", She tilted her head from side to side and then said "Ya, Ok".
She pulled her skirt up and squatted down, She had her knees together, Took a deep breath and spread them, She sat there biting her lip then looked at me and said "Shy bladder", She looked down at her pussy and said "See, It's not that nice", She had just a small v of hair, Very pale pink outer lips and nice pink inner lips, Her inner lips however are dangly, She does have an ugly pussy but I wasn't going to tell her that, She has the biggest inner lips I have ever seen and they dangle probably a full inch or more, I said "I love that, I would suck on those lips", I told her "Pull them", She gasped and said "WHAT???" I said "It'll help you pee", Which I had no idea about but I said it, She said "Pull...My lips???", I said "Ya, Want me to show you?", She gulped and said "Ok", I stepped closer, squatted down and reached between her legs, I couldn't believe I was about to touch my 20 year old sister in laws pussy, I pulled my hand back, Licked my fingers and then reached out, I took her inner pussy lips between my fingers and massaged them, She made a little moan and I looked at her, She was wide eyed and covering her mouth, She put her hands on my shoulders and I kept massaging them then pressed my side of my hand against her clit, I could feel it was rock hard she started breathing heavily, Her hips twitched and she let out another little moan, I kept going and she moaned "Oh fuck", I felt her get wet, Like dripping wet, She moaned a little and I kept going, She was lifting and lowering her head and then tilted her head back and moaned shaking her body, I took my middle finger and slid it in her, She moaned "oooohhhh gawd", She was super tight but dripping wet, I pulled my finger out and she sighed, I sucked my finger off then slid it back in, I curled my finger and found her big, Puffy g-spot, she moaned and closed her eyes, Lowered her head and started shaking, She quickly shuffled her top and bra down, Her big tits flopped out, I looked at them, they are different sizes and still are, Big salami slice areolae with big fat nips, I cupped her tit and rolled her nipple and she gasped once, Looked at me wide eyed and then gasped again, She moaned "Oh fuck...I..Am..gonna" and the started flooding, She squirted and moaned "Oh fuuuuck...What the fuuuuuck" and I kept fingering her and rolling her nipple, She was shaking and had her hands at her sides holding and squeezing her thighs, She was peeing and squirting everywhere and it was running down my arm, She grabbed my arm as the squirt slowed, I stopped and held my finger in her feeling her pussy massage my finger.
After maybe 15 seconds she pushed my hand away and let a little more pee out then squatted there gasping for breath, She said "Ooohhh fuck, My abs hurt from cumming, I have never came more than once and what the fuck?", I giggled and said "Never squirted before?", She said "Fuck no and I am not sure if I liked it but....Wow", She sat up on the back bumper of the camper and was breathing heavy, I reached down and cupped her boob, She looked up at me and scowled, She said "Do you want me to help you cum?", In about a second flat I had my pants pulled down and she leaned back saying "Jesus christ", She reached out and stroked my cock and said "Oh man, It's big", She leaned forward and sucked me hard and fast, I came in her mouth and she swallowed it all moaning "Mmmhhhmmm", She sucked me clean and then stood up, We got dressed and then she put her hand on my chest, Looked me in the eyes and said "I don't know how you did what you did but you are a master...And...Jesus you have a big dick, Good for you".
We had gone and sat back down after she went inside and changed into sweats and maybe 10 minutes later my wife and her friends stumbled along. We all had another drink or two and went to bed, My wife's sister was staying in our camper on the pullout couch and in the morning I got up to make coffee and then turned around and she was laying there looking at me, She looked toward the bedroom door which I had closed and then pulled the blankets back, Spread her legs and bit her bottom lip, She cupped one of her big tits with her hand and bit her nipple through her shirt leaving a wet spot. I made big eyes at her while looking down at her pussy then she giggled and covered up.
For almost 17 years she has been a huge flirt and just does shit to mess with me, When my wife is in another room she will flash me her tits or her pussy, She has masturbated in front of me in situations where she could get busted like on our deck, In the boat, In the car, She sits in the back seat and flashes me when we go places, She has sat across from me, Slid her hand up her skirt or dress or shorts, Fingered herself then walked past me and put her fingers in my mouth, One morning after she stayed over I woke up and was having coffee in the livingroom in my PJ shorts, She walked over, Straddled me facing away from me, Pulled out my cock and jerked me off until I came all over the floor, She got off me, Took off her top, Wiped up the cum then walked downstairs and put on a different top. I see her about once a week, Once every two weeks at most and she almost always does something risky.
She makes me cum a couple times a month but mostly just messes with me and I love it, I hope we never get caught.

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