i never intended for any of this to happen. My wife and i where visiting her family out of state for the holiday. we were all swimming and drinking for most of the weekend. My wife has this cousin that just graduated high school. this girl was not super skinny but she had curves in all the right places. I love my wife and never thought of cheating on her but it is hard not to notice this girl especially when in a bikini. any way one night i couldn't sleep and my wife was passed out so i decided to go for a late night swim to relax and clear my head. i had just finished swimming a couple laps and was leaning against the side of the pool enjoying the cool water. my eyes where closed and all of a sudden i hear a voice, mind if i join you she said. i was startled and quickly turned around to she my wife's cousin standing there. i told her she scared the shit out of me and thought everyone was asleep. she apologized for scaring me and said she couldn't sleep and i guess had the same idea as me. i told her sure she could join me and i helped her ease into the pool. i decided to do a few more laps and i wasn't paying attention and didn't see her at the end and bumped into her and came up for air and to apologize when i see she is not wearing a top exposing her perfect little B cup tits. i asked what are you doing? she then goes on to tell me she has had a crush on me for some time. she then tells me she has fantasized about being with me. i tell her we can't i'm married to her cousin. she says i know and moves in closer pressing her breast against me and i feel her hand moving up and down the shaft of my cock. again i say we really cant do this. she then leans in and kisses me and then whispers in my ear, no one will ever know. she then proceeds to pull down my swim trunks revealing my now rock hard cock. she then grabs it and says looks like you want this as much as i do. she then leads me to the steps of the pool and has me sit just outside the pool and she stayed in. she then began giving me the best blowjob i have ever had. she was a pro going all the way down my 8 inch cock, sucking on my balls. my wife has never shown my cock the level of love this girl was now giving me. i was about to explode when all of a sudden she stopped and said my turn. we then switched places and i slowly removed the bottoms to her bikini revealing her smoothly shaved pussy. my wife doesnt even do that for me any more because she says it makes her feel like a little kid down there. i then without hesitation went down on her, her juices were already flowing and she tasted like heaven. she had to try so hard to not moan so loud because there were people still inside. i was moving my tongue deep inside her and massaging her clit when i could feel her begin to shutter and knew she was having an orgasm. she got back into the pool with me wrapped her arms around me and passionately kissed me and told me no boy has every made her feel that way. she told me she wanted me to fuck her right there in the pool and i was so horny i wanted her too. she wrapped her legs around me and i walked us to the edge of the pool about 5 foot deep. she was still so wet from her juices even in the pool water and i eased her down on to my cock. she was so tight she let out a little wimpier when i entered her. i asked if she was ok, she said yes that i was just so big but keep going. i finally got all the way in her tight hot pussy, it was a different feeling than im used to the heat of being inside her and the cool water on my balls. i began going slow so i didnt hurt her and after she got used to it she whispered in my ear, fuck me hard, so i grabbed her ass and she had her arms around the back of my neck and i started to slam her into my cock and she let out a loud moan of pleasure and i told her be quiet but i kept fucking her harder and harder and it was the hottest sex i have ever had i was about to cum and i told her i was going to and she told me to cum in her she was on the pill. i then had to biggest orgasm i have ever had, i actually went light headed and came what felt like a gallon in her. she then kissed me and said thank you and that she loved me, i told her i love you too. we had a few other opportunities alone that weekend and fucked outside and inside. we still text each other sexy messages since that weekend and my wife doesnt know a thing.