Someone watching

As a single mom who hasn't dated for a long time I find myself masturbating way to often. I used to wait until I put my k**s to bed, but now that they are older they seem to want to stay up longer and longer and getting that special time for myself is harder to get. I feel like I am 11yo all over agin, seeking a quick bath or shower to feel that feeling that I crave so much. To make things worse, my sister moved in with me three months ago after separating from her husband. After my k**s went to bed and my sister wasn't home I couldn't get to my clit fast enough. I am sure all you single moms know what I am talking about. I have an old candle next to my bed that I use for penetration and pinch my clit between my thumb and finger stroking it like a man jerks off. Right during my second orgasm as my body twitched I caught a glance of a nose outside my bedroom door. Pulling the covers up I asked who was there, but got no answer. I ask again and the response I got shocked me. I thought it was my 10yo daughter, but it was my sister. Her face was bright red, but see told me I didn't need to stop and I started freaking out. She turned and walked out of my doorway and down the hall. I didn't know if I wanted to yell or cry. About them minits later she pushed my door open and I was totally shocked by what I saw. She was nude and fingering herself. I didn't say a thing, our eyes locked in a stair, she walked closer to me until she squatted on the corner of the bed , her hips thrusting her back and forth on the bed and suddenly stood up looked straight into my eyes she started cumming. She fell onto the bed breathing hard and beads of sweat were rolling down her forehead. After a few moments she looked at me and said we were even. I couldn't believe how turned on by watching my own sister get off. She scooted closer to me and put her hands on my knees and suddenly pushed my knees up to my chest and looked down at my wet pussy. Touch it she said. I didn't quite know what to say or do, and again she said to touch it. With my heart about to explode from my chest I took my hand and moved it down to my hairy pussy, at first just covering it up. Touch it you little cunt, she said and with that I started rubbing my hard clit and started coming in record time. It was one of the best orgasm I ever had. That was the start of something that has gone on for a year now. Her sneaking into my room and watching each other masturbate.