Note: This story was dynamically reformatted for online reading convenience. Accidental Motherfucker Jerking off in the shower is almost always an exercise in frustration for me. Even while I'm fapping away there's an invisible clock in the back of my head ticking away the seconds until either I run out of hot water or Mom busts into the bathroom to yell at me for using up said hot water. On top of that, for me standing up while jerking my cock isn't the most comfortable position, it's much easier to spank out a load sitting or lying down. But mostly it's that fucking clock in the back of my head counting down the seconds that makes jerking off in the shower so damn har-er, difficult. Given a choice I'd much rather toss a load off in my bedroom and I usually do when given the opportunity. That is, when my little sister isn't home or is otherwise occupied with something that keeps out of our bedroom. Yeah, I share my bedroom with my sister. How much does that absolutely blow? Anyway, to get the point, my sister was home and I was furiously beating off in the shower. I stroked my well-soaped cock with my right hand while clutching a bar of soap in my left in case my cock needed a re-soaping. I was in the zone, or nearly so. I could feel that familiar and welcome pressure at the back of my cock and I knew that soon I would reach the point of no return. I was fantasizing about the girls in my gym class. Or more specifically, fantasizing about fucking them all in the girl's locker room. I pictured them all naked and lined up; faces pressed to the cold concrete floor with their smooth round asses up in the air for my inspection. As my fantasy-self lined up behind a pretty blonde whom I hated I groaned and tilted my head back. I was so close! The thought of hate-fucking that little bitch was driving me closer to the edge and I pushed my body into a taut arc, standing up on my tippy-toes in anticipation of my long-awaited cum. Then Mom burst into the bathroom and ruined everything! "Summer! Get your ass out of that shower now! How many times do I need to tell you that you're going to use up all the water?" Fuck! My fantasy faded away and so did the orgasm I had worked so hard to get. I managed not to curse out loud but I sure the fuck was swearing up a blue streak on the inside. Outwardly though I managed to sound bored, detached even. "Mom, I'm not going to use up all the water," I replied through the shower curtain. "I might use up all the hot water but there will still be water coming out of the showerhead." Mom didn't find my cleverness the least bit funny. "How'd you like that smart mouth of yours eating a bar of soap? Now get out of the shower!" "Okay, okay, in a minute," I grumbled. I was still stroking my cock even though the cliff I had been driving myself towards had receded far into the distance. I knew it was hopeless but I hated giving up after coming so close. "Now, Missy!" Mom yanked the shower curtain open, giving us both an incredible shock. "Mom!" I screeched as I yanked my hand away from my cock and twisted away from her at the same time. The forgotten bar of soap fell from my left hand and landed unnoticed on the slick floor of the tub. "You were masturbating?" she said, shocked. With one hand I tried to cover my cock while trying to hide my tits with other. More or less useless gestures; my cock was much too hard and long for my hand and my tits were also too large to be covered completely although I was able to hide my nipples. "Yes!" I yelled, humiliated. Being caught whacking your meat by your mother is the worst. Worse even than being caught by your sister. "Sometimes people do that, you know!" "God, I didn't need to see that," she said, averting her gaze away from my cock. Only she seemed to have difficulty keeping her gaze averted as I noticed her glancing back at it. "Anyway, get out of the damn shower. I need a shower myself before I go to bed. I'll deal with you after I finish taking a shower." That's when I noticed she was wearing a towel wrapped around her, tucked over her breasts and hanging down just far enough to cover her ass and pussy. "What are you waiting for?" she snapped. "Get out before the water runs cold!" I stepped out of the tub. Or I would have if I hadn't stepped on the bar of soap that had slipped out of my hand. So instead, I fell out of the tub with a shrill screech of surprise. In a desperate attempt to keep myself from falling flat on my face I instinctively reached out to grab Mom to steady myself. Unfortunately, I only managed to get a hold of the towel wrapped around her. With my forward and downward momentum I plowed face-first right into Mom's tits. We tumbled ass over teakettle with me landing on top of Mom's naked body. She must have had the wind knocked out of her because she was gasping for breath once we came to rest on the floor. My face was wedged between her tits and I found her heaving chest to be very, very pleasant. Who knew Mom has such nice tits? Mom just lied there gasping for breath while I lovingly nuzzled her boobs with my face. Then she shifted and I felt something brush against my cock. I realized what I felt was Mom's cunt. I had landed right between her legs. "Ah, Summer, I don't think you should do that," she said as I hunched my hips forward, rubbing the tip of my cock along the groove of her pussy. I didn't answer. Instead, I sucked one of her nipples into my mouth and gently chewed on the hardened nub while rubbing my cockhead against the entrance to her vagina. She sighed. "Really, you need to stop right this instant, Summer." However, she didn't attempt to push me off. Moreover, that sigh had sounded like one of pleasure. Her words seemed perfunctory, as if she were repeating what she knew a proper mother was supposed to say in such a situation. Until she threw me off I wasn't leaving and she gave no signs of pushing me off. Unconcerned, I turned my attention to her other tit. She moaned as I took the previously ignored nipple between my teeth. It wasn't like I had dreamed of fucking Mom. Quite the opposite really. Before that I would have laughed at the idea of fucking Mom, calling it gross and disgusting. But at that moment I was hard, horny and very frustrated thanks to Mom busting into the bathroom at precisely the wrong time. Besides, as the saying goes; 'a stiff prick has no conscience'. Not that I thought Mom was disgusting, far from it. I knew she was good looking and in pretty good shape. She worked out at the gym several times a week and went swimming at the Y in what she called her 'constant battle of the bulge'. She seriously looked better than most women ten years her junior. No, it had nothing to with her looks or her body. It had everything to do with the societal knee-jerk reaction that incest is gross and wrong. However, as I lied there atop Mom's body with my face in her tits and the tip of my cock prodding her cunt I had the thought that while incest might well be wrong perhaps it wasn't as gross as I had thought. I pushed forward with my hips, slowly drilling my cock into Mom's pussy. She was warm and wet and felt oh-so-good around my cockhead. I closed my eyes and let her tit fall from my mouth. At that moment my whole world was the end of my cock pushing into her wet cunt. "So good, so fucking good!" I gasped. Fucking a pussy wasn't anything like jerking off. There was just no comparison. The best thing about jerking off in the shower was the feel of the warm water spraying against my hard cock. I often imagined it felt something like a blowjob and often fantasized that I had a girl on her knees sucking me off. Whatever a blowjob felt like at that moment I knew that water from the showerhead paled when compared to the feeling of being in my mother's cunt. "Oh god," I sobbed. I resisted the urge to bury myself inside her pussy straight-away. I was fucking for the first time ever and I want to savor the feeling of my first ever penetration. "Honey, you can't do this," Mom protested, making a last ditch effort as I slowly sank myself into her. "I'm your mother. You can't fuck me." "I beg to differ," I grunted as I jammed myself the rest of the way inside to underscore my point. "I must certainly can fuck you." I pulled back and then roughly thrust back in. "Oh fuck," she groaned, what little resistance she had left crumbling away to nothing. She let her legs flop open even further. I took that as an invitation and rolled my hips, pistoning my cock deep into Mom's pussy. The bathroom filled with the wet sounds of my cock churning her wet sloppy cunt and the sound of flesh slapping against flesh. My groans mixed with hers, all of which added to my excitement and pushed me closer to edge which I realized wouldn't be long in coming. "You need to be quieter," Mom grunted as I gave her a particularly hard thrust. "If you make too much noise Autumn will hear you." I bit my lip to keep myself quiet as I slid my length into the slick grasp of her vagina. Mom was a bit of a hypocrite, despite scolding me for making too much noise she still moaned loudly as I fucked her. However, knowing how much she enjoyed being filled with my cock was setting me off and I reached that cliff I had been so eagerly running to. It was too quick, much too quick. "Summer, something wrong?" Mom asked as I held myself still after burying my cock deep inside her cunt. "Just cooling off a bit," I said, my voice showing the strain of keeping myself still. "Ah, right," she said. "You have a bit of a hair-trigger. That's normal for someone on their first time." She slipped her arms around me and dragged her fingertips over my back, tracing patterns from my shoulder blades down to my ass. "You know, sweetie, I wouldn't mind if we stayed like this for a bit. Just feeling that thick cock inside me like this is pretty nice." I nodded my assent and collapsed onto Mom's chest. My tits are fairly respectable but they were dwarfed by Mom's. Our stiff nipples bumped and rubbed as I mashed my chest against Mom's. Each time my nipples bumped into her hard nubs seemingly connected a circuit between my tits and groin. It wasn't as intense as driving my prick into Mom's soft slippery hole but it was making it hard for me to keep still. Then Mom reached under my ass and ran a finger along my slit. I flinched, startled by how good her finger felt against my female sex. As if that weren't enough she soon started squeezing my cock with her pussy. My eyes popped open. I didn't know she could do that! "Fuck, that tears it," I grunted and began fucking her again, sawing my cock in and out of her slick cunt. She was even tighter than before. I was on a freight train headed toward that cliff and I wasn't about to stop until I went over. There was no keeping quiet at that point. Mom and I both seemed be competing as to which one of use could scream our pleasure the loudest. With a shout of warning I drove myself into Mom's pussy as hard as I could. "Fuck, coming!" I grunted as I hilted myself so deep my balls were pressed against her ass. I gripped her shoulders and let my head collapse into the hollow of her neck, shaking uncontrollably as I filled her cunt with my seed. Until that moment I had never realized that it was possible for me to feel my cum shooting along the length of my cock so intensely. Buried in Mom's cunt not only was it possible but the feeling was intense and strangely fulfilling. When I finished shooting my load I rolled off of Mom, pulling my deflating cock free of her slimy pussy. I sighed, after orgasm the cockhead was very sensitive and stimulation was almost painful. I looked over at Mom. She was still sprawled out spread-eagle on the tile floor. Her hair was a tangle, she was covered in sweat, her cunt slimy with our combined fluids. In short, she was a mess and I had no doubt I was as well. "You know we can't do this again, right, honey?" I didn't answer right away. Certainly I wanted to do it again and I had the thought that anything that happened once could easily happen again. However, I knew that arguing at that moment wouldn't increase the chances of getting what I wanted. "Sweetie?" I nodded my agreement. "Yeah, Mom, I understand." I managed to push myself up off the floor and crawled to the tub, pulling myself up to sit on the lip. Mom crawled over and sat at my feet. "You know, you really should clean your cock." She stared my cock, the longing in her face clear. "I thought you said we couldn't do this again?" She smiled up at me. "Well, I think technically this still counts as one incident. So it's not really 'again'." "When would it be 'again'?" I asked. She mulled that over in her head before answering. "Well, I think tomorrow." "So if I fuck you at one minute before midnight then it's technically the same incident?" Mom nodded. "Yes, I think you're right." Well, then. I knew what I would be doing come one minute before midnight. Mom gave me a knowing smirk. "I know what's running through your head, Summer. But first let's clean off your small head down here." She grabbed my limp dick and sucked into her mouth. I closed my eyes and enjoyed the feeling of her tongue flicking against the head of my cock. Despite the fact that I had just come only minutes earlier I could feel myself getting fat inside her mouth as she worked her tongue over the flared ridge of my cockhead. I sighed as I hardened in her mouth. If she kept this up I knew I'd be shooting my next load down her throat. That's when the bathroom door slammed open. I opened my eyes to see my furious younger sister standing in the doorway. Furious and shocked. "What the hell is going on here!" I have to give Mom credit. She was wholly calm, cool and collected. Unimpressed with Autumn's display of rage she casually spit my cock out of her mouth. "Missy, were you raised in a barn? Because I'm sure I taught you to knock before opening the door. Now close the door and try it again like a civilized young lady."