My redhead siter’s redhot love

It was summer,our parents decided we needed a vacation. I live with my mom and dad and 20year old sister who was at collage, she came home for the summer. She had red hair, blue eyes, yeah imagen that, red hair and blue eyes. She had 32D boobs which any guy would drool over, but she had those long legs, all the way up to her tight, but not to tight firm ass. That would let any man stare twice when she walked the streets. I’m in pretty good shape myself, I have a nice toned body, not too big, but just enough get the ladies, it is probably because I am a swimmer, I love swimming and was on the school’s swimming team . I have blue eyes (it must run in the family) and is 16, standing at 5’9″ and my sis is 5’6″.
So my parents decided to go on a vacation, but me and my sus wasn’t very keen on going, I had plans to go dirt biking with some friends at a place we built ourselves. My sis wanted to relax and just hang out with some friends. She had no boyfriend, but I am sure she was no longer a virgin. I had a girlfriend, but she wouldn’t let me fuck her, and she left me.
The day our parents left, they gave us a set of rules, don’t do this, don’t do that and so on. After they had left, I went to get my bike. “Hey James (that’s my name) where are you going?” Tanya asked me as I headed for the garage. “I’m going to a Mike’s house with my bike, just gonna hit some ramps and so.” She looked at me with a smile, I had noticed her before that she was beautiful, but now I see that she is a goddess. “Sounds fun, which friend are you going to?” ” I’m going to go Mike’s house, then to that dirt bike place which we built ourselves.” “Oh cool, that sounds fun. Well enjoy, see you later.” She said and went back to the house, she was wearing training shorts and a strapped shirt (she probably went out to jog or something) I stared at her ass as it wiggled as she walked. She disappeared into the house. I got my bike but remembered that my helmet and cloves were in my room. I went into the house and went upstairs to my room. I passed my sisters room and heard a small moan. I didn’t pay attention and got my helmet and cloves. I passed her room again, and heard a louder moan. I was now very curios. I went to her door and then I heard her moan again. I peeked trough her keyhole, I saw her laying on the bed, naked, with her one hand on her tits and the other one between her legs. She was fingering HERSELF! Now I masturbate, any boy does, and I knew girls did it too and seen it on the internet, but not like this, not so real and the best part was it was my HOT sister. My cock was now getting hard, but at that moment my cell rang and I jumped. My sister stopped and got up from bed heading for the door. I shut off my phone and ran downstairs quickly. I got on my bike and went as the speed off light of to Mike’s house. The day went on and me and Mike and some other friends of us were riding hard. I said goodbye to them, now tired but it was a fun day. But the image of my sister masturbating would not leave my mind. I parked my bike, sawing how dirty it was, made me decide that I need to wash it. I took the bike to the back off the house. We had a nice pool and a bar place where my parents would hang out with there friends. At the back we had a cement space where i washed my bike. I parked the bike and sneaked into the house, not wanting to confront my sister.