[MF] I [37m] saw my gf’s younger sister [27f] full frontal nude

This happened over the weekend. Went to a wedding and stayed at a hotel in the same room as my gf’s younger sister and her bf. Wedding was through so we got back to the hotel late night and were changing into comfortable clothes for the hotel after party. She was in the bathroom changing with her bf when I walked by as her bf was opening the door. Well there she was, fully nude in front of the giant hotel bathroom mirror. My eyes instinctively traveled to her legs as I examined her body from top to bottom. From her bald pussy lips to her tight stomach and up to her perky tits and perfect pink nipples. Her skin was so fair and her figure slender and sexy. By the time my eyes reached all the way up, I locked eyes with her. We stared for a brief moment before she gave me an absolutely seductive wink and closed the door. I have been thinking about it ever since and get so hard every time. I wouldn’t care so much if it wasn’t for that wink at the end. She a pretty big brat sometimes so never really thought of her like this until now. But now all I want to do is dominate her beautiful body.