I am a 15 year old black guy, well endowed for my age, we have my female cousin staying with us who walked in on me while I was having a pee early in the morning, she laughed out loud at me because she could see my penis pointing and the fact I couldn't stop. She is 2 years older than me and since then she keeps making comments about how often I go, the other night she locked my bedroom door from the outside, I found out when I got up, everyone had gone to work, she was downstairs, 7.