First time for cousin

This happened about 10 years ago when I was 22. I had just graduated from college and was looking for a job. My parents were going to Florida with my uncle, aunt and their three daughters. The oldest daughter Joan was 17, with legs that wouldn't stop and breast that ached to be sucked. Her two sisters were 14 and 10, both pretty good lookers. The 14 year old was developed with small but very firm titties, and younger one was just starting to sprout. I rode with my father, uncle and Joan all the way to Florida. We drove it non-stop, which was about 24 hours. My mother and the rest of Joans family were in a separte car. Joan and I were in the back seat, and talk most of the way. She had a short skirt on (this seemed to be all she had in her wardrobe), on and every time she moved I tried to get a peek at her pussy. I think she noticed what I was doing, and began to tease me by spreading her legs ever time she tried to get more comfortable. I got a really good glimps of white panties with dark blondish hair poking out. The first night in Florida, Joan and I went for a walk. Joan asked if had liked what I saw on the way down. Somewhat embaressed, I asked what she was talking about. "Come on, you know exactly what I'm talking about. You tried to get a glimps of my crotch". I told her, "its normal for a guy to try and sneek a peek, and I'm your average horny guy". She then asked if I had ever "done it". "Done what" I asked. "Fucked someone before" she replied blushing. I had been sexually active since the age of 12, mostly beating my meat, and for some reason I was very honest with her and told her so. At this point she grabed my hand and pulled me into a wooded area. She sat down next to a tree, and I followed. Totally by accident, yes it was truely an accident, I sliped, and my face ended up in her crotch. I could smell that musky smell coming from her pussy and I immediatly got hard. Joan jumped a little, but didn't move, so I asked her "whats this" and moved my tounge to trace the outside of her lips throught her white panties. I could feel her jerk and heard a small gasp, but she didn't push my head away. I pulled back her panties, and there before me was the pretties bush I had ever seen. Her outer lips were covered with dusty blond pupic hair, and they were open just enough I could see her swollen clit poking out and her young wet slit all the down to her ass. By this time I was going crazy with lust, I slid my tounge into her slit and heard her moan with delight. I looked and noticed she had her eyes closed and that she had moved her hand into her shirt and was playing with her tits. She moved her hips into my face, and almost screamed. I was so afraid that someone would hear her that I took one hand and covered her mouth. I moved my tounge all around her clit, then down to her ass, and back up. When I reached her clit the hand that wasn't touching her tits grabed my head and pulled me into her. At this point, she came, and it was the strongest longest orgasm I have ever felt on a woman. After her orgasm, she lay back with her eyes shut, her little pussy wide open and beckoning. I half unbuttoned/tore her shirt off to reveal two breasts that were perfectly proportioned with nipples about the size of quarters. I pulled my pants down and straddled her, with my ass on her pussy. She opened her eyes to see what I was doing, and I began to stroke my dick as fast as I could. She looked at me and reached underneath my ass to touch herself. This did it. I couldn't hold back any longer. I let go with the biggest load of my life. I shot all over her face, neck, and tits. Her mouth was open because she was still breathing heavy and I noticed that a stream of cum went from her chin to her forhead. I actually think she liked the taste of my cum because she licked her lips. I rolled off of her, my cock still throbbin, and just said "wow". She looked at me and said "you know I'm still a virgin and no one has ever touched me like that. I always wondered what a man looked like when came and what it tasted like" She looked at my cock, and gave it a few more strokes then, wiped her face, buttoned her shirt, and pulled me up. My night of fun had come to an end. We're both married now, but every time I think about this sexual experience, I have that urge to pull it out and start jacking off.