Confused about something that happened while swimming with my cousin?

My cousin and 2 other people and I were swimming and playing around. My cousin (female) is 36 and I'm 16. When we were playing, she lunged for a ball and her bikini top slipped down and I was in the front row for the boob show. Out of respect for her I averted my eyes and dove under water nonchalantly, giving her an opportunity to fix herself. But I still couldn't help myself from noticing her breasts. Honestly, they were magnificent, and I have always been aware of her sexual attractiveness. I thought about it in the shower later and can't stop thinking about it, and part of me wants to see more. I know some of you will say sicko but go f yourselves if you can't help me to deal with these feelings. So bottom line question is what should I do about my sexual attraction that was made even stronger by this incident?