I was walking by my sister's room and heard her moaning. She didn't have her door closed so i walked in. She was fingering herself and was naked on her bed. My sister was 3 years youbger than me. She saw me and gasped. She blushed and cried. She was really embarrassed. I told her not to worry and that it was normal. She stopped crying and asked me if i masterbated. I told her that i did and that she should close her door when she was doing it. She told me she didn't think i would come i since my mom and dad were away traveling and i was watchng tv. I told her that since we were alone we could masterbate togther and walk naked around the house. She was excited and told me to strip and be naked. I stripped and she was smiling happily. I asked her how she masterbated and she told me she rubbed her pussy on different objects or fingered herself. I told her to wait and i brought my 2 dildos and clit vibrator/massager. She stared at them and her eyes were wide with amazement. I opened my laptop and I opened porn for us to watch. We were masterbating and horny as hell. She looked at my pussy and blushed. I told her that it was okay if she wanted to finger me and eat my pussy. She tongue fucked me and i climaxed. She sucked on my nipples and made me wet. She squeezed them and sucked them again. I was now moaning with pleasure. When she finished she looked at me and asked shyly if i would suck her nipples and eat her pussy. I agreed immediatley. I slipped three fingers in her pussy and started massaging her breasts with the other hand. I sucked on her nipples and made the go hard. I licked her pussed and when she climaxed i sucked on her pussy and tongue fucked her. We do this every weekend because our parents traveled every weekend. I never get bored and wait every week to have an awesome naked and masterbating weekend.