My Secret Spying

I'm not much of a writer so don't know how to put down in words the way I would like but I'll give it a try anyway. Since I was little I used to spy on my mother and sisters as often as was possible. I remember touching myself from early on, even when I was to young to orgasm or even know what it was. My favorite was mom because she had boobs and hair on her vagina. Both my sisters were younger than me and it was only when they started getting pubes that I would start spying on them. My parents got divorced when we were little so we never really knew a man in the house. It was only when I was about fifteen that I realised that the soft moans coming from moms room was her masturbating. In the beginning I would lie still not to make her hear me awake and maybe stopping what she was doing. When I was sure she was asleep again I would have a wank and come in seconds. This went on for quite a while till I needed more visual stimulation as well. One night I waited till my sisters went to sleep and then softly went to moms room. The door was closed. I slowly bent down to the keyhole and peeked through. The light was still on and I could see her reading a book. She was sitting upright against the headboard with her legs slightly drawn up. The book was resting on the duvet between her knees. Her left hand was under her PJ top and I could see her caressing her right breast. She was still reading and I knew that she was reading some erotic story. I slowly took my cock out my pants. It was allready hard and I slowly started stroking it. She took her hand out and turned the page. I could see her stiff nipple poking against the thin material of her PJ's. She sat up and then lifted the top over her head. Her breasts were small. I guess about a 32 A cup. Her nipples and the surrounding area were a darkish pink. She sat back and carried on reading, her hand alternating between the soft mounds on her chest. I had to stop stroking myself at this stage in fear of coming too soon. After a couple of minutes I saw her moving her hand down toward her pussy. I could see the duvet move between her legs. As the movement picked up speed she closed her eyes. She did this for a minute or so before suddenly stopping. She closed the book and put it on her bedside table. She opened the duvet and pulled down her PJ bottoms by lifting her bum from the bed. She lay down again, this time her one leg straight down and the other pulled up high and to the side. I had a glorious view of her naked pussy. It was covered in dark curls and her long labia was scrunched together. She moved her hand down through the hair and parted the thick fleshy lips. I could see a small wire of wetness stretching between the lips. She was soaking! By this time I was pulling at my cock at a rate that would have me cumming soon. She rubbed herself with one hand and the other was caressing her drawnup leg up and down all the time. I focused on her pussy again and then it happened... I started cumming. I stood up from my bent over position and squirted my couple of drops onto the door. Damn, my self control was weak! I softly wiped the cum from the door and peeked in again. I nearly had a stroke. My mom wasn't on the bed anymore. I bolted for my room and dove into bed. It was only then that I heard the toilet in her en suite bathroom flush. She must have orgasmed just after I did and then got up. I have after this experience spied on her often and have seen her orgasm more than once. I'll see when I can give you some more of this. It turns me on thinking how sharing personal stuff like this turns you on as well. Is this sick?