My Sisters Secret Encounter Exposed: A True Teenage Brothers Embarrassing Experience

This has been pent up inside for years. I have never told a soul until now. As to whether this is a true story or not, it is true to the best of my memory. The thing is there truly are two sides to every story, so I am telling my side.... The way I remember the following events.
I was fifteen playing football on the high school freshman team; left outside linebacker and second string fullback. I wasn't real big. From the time I started school until eighth grade I was one of the biggest kids in my grade, however, I stopped growing and everyone else shot up the summer before high school. I was five foot eight and weighed around 120 pounds. Shoulder length "almost" black hair and was shaving by this time about twice a week.
Football practice at my school started a week or two before school started, so when I came home from afternoon practice my younger sister Kimmy was home and my mom got home from work about fifteen or twenty minutes later.
On this particular day I came in the house and trotted up the stairs, a flow of adrenaline still pumping through my body from practice. At the top of the stairs there was the master bedroom to the right and two smaller bedrooms to the left. I turned left to go to my room and Kimmy's door was open and she was listening to a new record. (You know those things that had music on them before CDs or cassette tapes) "Hey come in here and listen" she said before I could get to my bedroom. I walked in and dropped my duffle bag on the floor and sat on the floor next to her. I honestly can't remember what she was listening to but she ranted on about it for a few minutes.
A little bit about our relationship here. I was two years older than Kimmy so although I was always the protective big brother, a lot of the time she was just an annoying little brat. Don't get me wrong; I loved her and didn't mind hanging out with her.... Unless there was something better to do. Kimmy was about four foot eleven, on a tall day, and at thirteen had not begun to develop yet. Her hair was a couple inches longer than mine and a couple shades lighter. She wore glasses that were a little too big for her face and at that age was what one might refer to as an ugly duckling.
So we are sitting on the floor and Kimmy all of a sudden lies out across my lap to grab my duffle bag that was on the opposite side of me. She pulls it back to her unzipping it along the way. "What you got in here?" she asked, pulling my jock strap out and holding it above her head. I can't even begin to describe how fucking embarrassed I was. "Give it here" I yelled diving for it. Kimmy dropped to her side on the floor clenching my jock strap in both of her hands. I tried to grab it from her as we wrestled on the floor but she was wirey and kept squiggling away. To my shock, as we were flopping all over the floor I realized I had a massive hard on. I finally got the strap back but as I was opening my duffle bag again to put it away, she grabbed it out of my hand again. She stood up, and I jumped up knocking her on the bed on her back, falling on top of her; still trying to grab the jock strap that was again above her head. So this is the scene. My baby sister lying on the bed, legs spread, arms stretched above her head... me lying on top of her, my virgin cock pressing into her pubes with my hands on her hands trying to pull that fucking jock strap out of her hands..... Both of us squirming in our little fight..... and our mom walks in. "What the hell are you two doing??!! Get the hell off her.... Go to your room!" Twice now in the last couple of minutes I was mortified. The jock strap fell loose in Kimmy's hands and I grabbed it up in one hand swooped up my duffle bag in the other as I ran to my room.
Mom turned around and marched down the stairs. I sat on my bed, door closed with a million thoughts going through my head. "God I am in so much trouble....Mom probably thinks I was dry humping Kimmy..... Aw shit I have a hard on still..... I was dry humping her! the thoughts rolled through my head. I got up and locked my door, dropping my pants I took my cock into my hand and started stroking it slowly. I went over and lay on my bed stroking harder and faster.
As I said I stopped growing that previous summer, so by this time, my cock was as big as it is now..... seven and a half inches but pretty fat. When I looked down at my cock in my hand, it was as big as I had ever seen it previously. Looking back, I was just a teenage boy with hormones going in every direction.... But that day all I knew is that I was horny as hell. When I shot my load I thought for sure it would hit the ceiling; of course it didn't. It did go everywhere though. I ended up running to the upstairs bathroom to get a wet wash cloth to clean my jizz off my neck and chest, my bed spread and even off the carpet.
Shortly after mom called us down stairs for dinner. When I walked into the modest dining room Kimmy was already there. Still in her playful mood. When I stepped into the room she was waiting and pinched me hard in the side. Now I don't know what was going through her mind, if anything, but I was still freaking out about what mom thought. So being a fifteen year old boy I punched her in the arm..... Just as mom walked into sight. "What has gotten into you today?" she blared. "You two have been fighting ever since I got home.... Now it's time to stop or you'll both be grounded 'til Jesus comes back!" Mom wasn't religious; it was just her way of saying 'forever'.
Now to this day I don't think it was intentional but with Kimmy's goofing off and pinching me it solidified, to mom, the fact that we were fighting and not that I was trying to get into my little sister's pants. That took a lot off my mind. The three of us sat and ate dinner as we always did; mom at

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