I slept with my second cousin

I was never really close to my cousin growing up. One day at a family party my cousin and I were drinking heavy and started talking. The conversation lead to sex and she told me her all of her favorite sex positions and how much she liked oral sex. After about an hour of talking and hearing her stories I was very horny and started to have sexual thoughts towards her. The day turned to night and we light a bon fire out back and sat talking. After awhile, everyone else went to bed and we continued to talk, the conversation still on the subject sex. I couldn't stand it any longer and asked her to give me a demo of her oral skills. To my surprise she asked me strip down and she would do more than just a demo. I had my pants unzipped and open in a matter of seconds. When her hot lips touch the head of my dick I couldn't help to push as much as I could into her mouth. After a short time, Or it seems, I moved down to remove her shorts and pulled her panties aside to taste her. The smell and taste of her juices drove me mad with lust and I stood up and stuck my dick into her. We had sex right there for over an hour. It's been a few years and we have had sex a few times since then, but I would like to know if it is normal for someone to lust for their cousin.