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Hi. My name is Morgan, I am 37, and I grew up in the US. I am not totally sure why I am writing this now as I have never really talked about this with anyone (well one person sort of). I guess because on one hand I am very self-conscious about this subject and on the other hand, when I think about or fantasize about this, it is still such a turn on. I grew up with my mom and my sister. My dad split when I was five. We never had much money so we were constantly bouncing from apartment to apartment. Hence, I ended up sharing a room with my sister a lot. From the time we were little through my sister leaving when she was 17. She is three years older than me. About the time I began to watch my sister to go through puberty. At first, it didn't have much impact. We had seen each other naked a thousand times. Only now my sister had boobs and was a little shyer around me when she dressed. No big deal. I was young and hadn't started masturbating or thinking of such things yet. That kind of changed when I was 13. I remember vividly the first time I felt sexually stimulated and then masturbated. It (in a way) was a life changer. I was showering and Lily (my sis) came in the bathroom to take a pee. This was standard operating procedure as we only had one bathroom. Only this time, I felt somewhat naked in a way that I hadn't before. Funny. And when I heard her peeing, I curiously stole a glance through the door and looked between her legs. Seemingly in an instant, I became aroused. She looked up and saw me gawking at her and kind of shrilled "hey, what are you doing you dork!" In a way, I didn't know. I said I was sorry and she left. But as I turned back to the shower, I was hard. Of course, I had been hard like that many times before, but this time I kind of instinctively started to touch myself. Truthfully, it sent shock waves through me. I began stroking it (awkwardly) and had an orgasm in no time. Cum came out in streams, on the shower door, then on my hand, and then dripping on my feet. I kind of buckled. It was wonderful. From that moment on, I was a daily masturbator and very keenly interested in seeing my sister naked. It was kind of my mission or so it seemed. I would walk in on her when I knew she was changing, showering, making out with her boyfriend, pretty much anywhere or anytime I could. Strangely, she would never get real mad but would just shoo me off with a little bluster and feigned anger. While never feelingly encouraged, I never felt scared enough to stop. Why, I don't know. My sister was not what you call classically hot or anything. She was cute. This was the end of the seventies mind you. She was skinny, fairly flat (b), and dressed pretty plainly. Though to me, I was fascinated by her body. I guess kind of weirdly so. But my friends would talk about their sisters too and so I didn't think I was too strange. Our bedroom was really more of a sleeping and changing station. It was cramped with two beds and did not have a TV. Lily was pretty social and out of the house. I played outside with my friends or would watch endless amounts of TV. The only time we really were together in there was at night to sleep. The escalation in this affair (no pun) began a few months or more down the road. I came home one day after school and burst in the door. Lily and her boyfriend were on the couch and she was in her bra and her pants were undone. I looked over and on the other couch was a friend of hers and she had her top off too. Instantly I was aroused and instantly they were horrified. "What are YOU doing here?" You are supposed to be at Billy's!" I know, I know I said but I needed to get my bathing suit. I had forgotten it. I said don't worry, I won't tell mom. And before she could stop me, I flung our bedroom door open only to find her best friend Shannon naked, and having sex. On my bed! This was exciting, almost intoxicating to me. Sex. I had wondered but never seen it. My naked sister and Playboy were about as far I had gotten. They pulled apart to try and cover themselves. I saw everything. Shannon was on the bottom and her legs were totally apart. Her boyfriend (?) pulled out and I saw his hard on. The first thing I thought was that his was considerably bigger than mine. I didn't care really. I was fascinated...... though not for long. Within about five seconds, everyone in the house shouted at me to get the (bleep) out. I darted in my room, past the two on my bed, grabbed my suit and dashed out. While I knew that that wasn't going to be the end of it, I flew back to Billy's and told him about it. It was as such a rush. I had hit pay dirt! When I came home, nothing was said at dinner and we did what we always did; homework, then TV, and then bedtime. 10pm. I was in bed when Lily shut the door to our room. Immediately "I can't believe you, you little pervert." "How did you know to come home?" "I know you like to look, I catch you all the time!" She was somewhat flamed. At least at first. I claimed innocence. That I really did need my suit, that I had no idea, etc. I must of have been fairly convincing as she backed off right away. She then asked me if I had seen anything like that, pictures, friends, had I been naked with a girl, et al. I said no but almost immediately upon being questioned, I stared to get hard and right in front of her. I was lying on my bed in my underwear and had nowhere to hide. I tried to jump under the covers but it was too late. "Sicko!" "Are you getting a boner?" She couldn't believe it. What could I say? I was caught. Yes, I said. Sorry. I couldn't help it. She continued on and asked if I masturbated. I kind of mumbled. She asked again, do I masturbate? I said yes, I did. She asked if I had looked at her underwear before. In the hamper. Guilty I said. She asked if I had cum in her underwear. Her panties. Guilty again. She was trying to be mad but I could tell she wasn't. She was giving me a hard time but in not so hard of a way. I still felt sexual or stimulated. I was hard under the covers. She relaxed a bit, sat on her bed and asked if I liked seeing her friends have sex. Yes. I sure did. She then asked me what I saw. I said everything. Her gina (family speak for vagina), his thing, everything. For some reason, I blurted out that it was exciting. She said, like you got hard. I said yes. She then asked if I went to Billy's and told him. Yes. Did we do anything, like jerk off together? I said no. We had never done that. She then asked what else I thought. I said that Shannon's boyfriend had a bigger one than me. I knew that everyone was different but I was wondering if I was small. She said I was just 13. I said I know but I had seen Billy and Thad's (my buddies)and they were bigger than mine. She kind of paused and then said she hadn't seen that many herself and thought she wouldn't know. Then in a move that I am still not completely sure why I did it, I asked her to look at mine. I said I was worried. She said no way but I sensed she was hesitating. So I asked again only this time with the caveat that we still see each other undressed sometimes and that this was all that would be. It just would be me pulling down my underwear. Slowly, she said yes but that I couldn't be a sicko. Just show her. So I pulled down the sheets and I was in my undies. Briefs like I had always worn. And I was still completely stiff. Achingly so. She sort of exclaimed "not hard, oh my god", but I said what am I going to do. I had a boner. She then calmed down and said "show me". And I did. She was pretty honest. "Well, it is smaller than the ones I have seen." How much I asked sort of strained. "I don't know she said, maybe an inch or more?" She did say that I had almost no hair above it or on my balls so maybe it would still grow. I then asked her how big they are supposed to be. She said she didn't know exactly but maybe like 6 or 7 inches. Intuitively, I knew mine was not nearly that big. I asked if I should measure mine and she said yes. She hopped off her bed, grabbed her backpack and grabbed out a ruler. To my surprise, she did not hand it to me but put it up next to my erect penis and said it was just over 4 inches. I was horrified. First, I was coming up short in a most important area and two, because my sister had just sort of touched me on my hard on. I did not know what to do. I pulled up my underwear and sort of sighed I guess. Quickly, Lily said don't worry about it. It would get bigger. I said but you touched it. Again she said, don't worry. It is a secret for just you and me. (lucky for me, it did get bigger, or at least somewhat) That didn't really end things for Lily and me. That night I masturbated while we were sleeping. Or so I thought. The next night, Lily asked if I was going to do it again. I said probably. So there developed a pattern that went on for the next two or so years before she moved out, I would masturbate at night or sometimes with her in the bathroom. We never crossed any big lines. She would sometimes show me herself naked, or in her undies. She even would touch herself a time or two when she wanted. And I would still steal her panties. Much later in life she told me she didn't know what to do after she moved out, not having to wash my cum out of her panties. I blushed but I laughed. I knew she was good with it. She was just teasing. Me too. Or at least mostly. Smile. Morgan