I am fortunate to work from home, as is my cousin Bianca who lives round the corner from me. My cousin who recently got married to a nice guy called Patrick has also become stepmom to Patrick's 12 yr old daughter Zenobia. Bianca on occation needs to go to meetings or meet with clients so she often sends Zenobia over to my house so I can look after her while she is away. At first Zenobia was fine, she would come accross to my house and swim,watch tv or just relax and play with my dog or sit and just ask me silly questions. However, lately things have changed and I am not sure what to do. Zenobia is been very sexual, flirty and very open about it. Let me explain, I went into the lounge to chat with her and when we were talking she put her hand down her top and I could see as small as they were she was touching her breasts. When I asked her what she was doing she told me she thought her nipples were cute and she wanted to touch them, she then took off her top and while pulling on her nipples asked me "don't you think so?" On another occation I went to the pool room outside to grab a cooldrink and make sure she was okay and while I was there I noticed she was laying by the pool jet with her legs open. When I asked her if she was okay and if she wanted to me for a cooldrink she stepped out the pool totally nude before SLOWLY wrapping a towel around herself. I asked her where her costume was and she pointed to the pool steps and told me she liked feeling the water on her naked body. My friend Roxy came around and Zenobia was hanging all over me as I prepared lunch for all of us. After lunch Zenobia started cleaning up the table and she stopped by me and picked up a paper towel and playfully wiped my face. Her fingers had clearly been in herself as we had been eating lunch. When I walked Roxy to her car she told me she had seen Zenobia playing with herself under the table and that she thought Zenobia has a crush on me and I should be careful. When my cousin picked Zenobia up one night she told me in front of my cousin that she could not find her black pen but if I did I would know it was hers. When I went to bed that night I found the pen under my throw pillows and it was clear that the pen had been inside her. This type of behaviour has carried on by me finding her panties in my underwear draw, her walkiing out the shower when she hears me and sending me nude pics of herself when I am on a date or even worse when her dad & I are together playing golf, watching sports or outside at the BBQ. Just last week she waked into my study naked to show me her first lady hair and then opened herself to me and asked me to show her where her clit was! Zenobia has even walked in nude on me when I shower , bath or I might be getting changed. I sat Zenobia down recently and explained her actions were wrong but she told me she could see my penis grow when she came in to my room and she liked that. I explained I was a man and that it was a natural response from my body to seen a nude girl and that it meant nothing. The talk did not do much good as Zenobia has just carried on as before! I have now resorted to lockiing my door when I am in my room but I dont see why I should be a prisoner in my own home. I don't want to cause trouble for her but it is getting to the point of no return for me. Any advice!