Jerking off my step-brother, Spied on by our Uncle!

My step brother and I have to stay at my Uncles house while my parents are in Europe this summer. Even though we are both over 18 I guess our parents didn't trust us home alone. I don't mind so much because I like being the little lady of the house. I get to fix meals and clean and be responsible just like a grown up. My Uncle is pretty hot for an older guy. I've noticed quite a bulge in his pants sometimes when he first wakes up and comes to the kitchen for coffee. I'm talking quite a big bulge. I know I shouldn't be thinking about the size of my Uncle's dick but I cant help it my hormones are out of control lately. Its been kind of nice having more time to spend with my step-brother too. It's fun to boss him around and watch him do what I say. He rubs lotion on me while I sun bathe. I like his soft hands on my skin. His touch turns me on. I can justify myself because he isn't really related. Today I think I'm going to push it and see if he will agree to let me be the boss of his cock. I've noticed he gets turned on when he's putting lotion on me and if he does again today I will take him inside and finish him off. Yep, just like before, he got a hard on. I'm in such a frisky mood I can't wait to take him to his room and get ahold of his dick. This is a secret between us. We've always gotten along so well so this seems totally natural between us. I love the way his stiff cock feels in my soft hands. I love knowing that I am the one who turned him on. I can't hump him all the way but I'm going to get myself off by rubbing my wet little mound on his leg. Oh, that feels so good. I was surprised I actually got so sticky wet by jerking off my step-brother! After I made myself feel good by grinding his leg I started furiously hand fucking his dick. I wanted to make him cum so good. I want my step-brother to feel as good as I do. He shot so much thick goo on my hand! I giggled as I called him disgusting and hot at the same time. Even though he is my step-brother I'm glad we love each other enough to take care of each other's needs. I felt I had to put on kind of a show as well because I noticed a shadow at the bedroom door while I was jerking my brothers cock. It was my Uncle, watching me. He must have forgot something and had to come back home from work. I wasn't going to be embarrassed for what I was doing with my step-brother. I showed my Uncle I'm not as innocent as he may think.