My stepsister_(0)

My name is Nate I am 31 yrs old. My mom just remarried three months ago. Her husband has a thirteen year old daughter named Anber. She has long blond hair,blue eyes and milky white skin. Ever since my mom startsd dating Rick two years ago I have always thought Amber was hot even at eleven. Amber and I get along really well. Rick and my mom went out of town last weekend I wached Amber while they were gone. My mom droped Amber off at 9:30 friday evening. I told her she could sleep on my bed because I live in a one bedroom apt. While Amber got ready for bed I steped out side to take a couple tokes off my pipe. When I came back in Amber was sitting on the couch waching t.v. She was wearing a pair of short shorts and a t shirt. I could see she didnt have a bra on because I could see the outline of her semi hard nipples. Her tits are only a hand full but there nice. I could not help but to check her out. I new it wasnt right but I am a horney fuck anyways. I have a major foot fetish and her feet were so pretty, her toes were painted with pink polish. We wached a couple movies then she went to bed about 1:30 am. she went and laid on my bed. About an hour later I walked in there to check on her she was laying on her stomach with her little feet pointed out where I could see the wrinkles on the bottom of her feet. I love to the wrinkles on the bottom of womens feet. I could not help but to stare at them . She was out cold and her feet were turning me on well of course her legs and ass was too. So I got on my knees and leaned over and started smelling her feet. They smelled so good,by this time my dick was gettng hard so I started rubing my nipples while smelling her feet. I always rub my nipples when I masterbate. So when I couldnt take anymore I stood to my feet and pulled my dick out and started to jack off. After about three minutes I was stroking fast and hard,you could hear the sound of my sack and my hand slaping, you know the sound I am talking about. I was so focused on her feet and thought she would not wake up. Well all of a sudden she raised her head and looked back and caught me I was fumbling with my dick trying yo put it back in my shorts. I was so scared all I could think about was telling her dad on me. I said I am sorry Amanda please dont tell on me. She said I wont. I said I find you really pretty and I was playing with myself looking at you. She smiled and said really,thats ok. Then I asked then I told her about looking at her feef and she said thats weird. Yes it is but I love them. Amber can I look at your feet and finish playing with myself she said sure so I pulled my dick back out and started to look at her feet snd stroke it then I said Amber can I put my dick in between your feet and stroke my dick like that , she said I guess so I put her feet together and put my dick in between her feet and closed them on my dick and started to feet fuck her. I was talking to her while I was doing her feet. I would tell her how pretty she was and how much I was enjoying doing this to her. She was smilling saying it tickled. I was holding her feet together with my left hand and rubing my nipple with my right hand,she asked me why I was rubbing my nipples, I said it feels better when I play with myself then I leaned over and ran the back of my hand over her nipples and said does that feel good? She said yea it feels ok. You will like it more when you get older. Her nipple got hard and I pointed that out to her and rubed it agin and it got fully erect she ran her hand over it and blushed. so Iwent back to fucking her feet, I fucked her feet until I felt the cum coming up and I asked her if she has ever seen cum she said no so I grabed my dick and squirted on the top of her feet. then I cleaned them off for her. She went back to sleep. I could not sleep because all I could think about was her telling on me. The next morning we were talking and I made her swear that she wouldnt say anything. Later she said to me that was cooll what I did last knight and I quickly asked her if I could do it agin she said yes. I did it agin that knight and she let me play with her titties even suck them, I even let her help jack me off she is liking it more and more. She never said any thing to the folks. I am going to have her over agin soon I asked her if she wanted to come back and she said yes. Look I want to fuck her bu t she is thirteen, a virgin and my step sister. I never thought I could feel something like this for a little girl but I do.What should I do? I could be fucked if I get caught. Thanks for your replies.