The Nightgown

This is a work of fiction. All persons are 18 or older.

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My name is David. I'm a student at a local community college. My sister Rebecca and I live with our parents in a house on a quiet street in the suburbs.

One Sunday morning, having taken advantage of the quiet of my parents' absence, I had just finished a really long self-study session in my room and had to pee badly. Clothed in my usual sleep attire of boxers and nothing else, I hurried down the hall to the bathroom door and found my sister already there brushing her teeth.

I was used to seeing Rebecca in oversized tee shirts, but lately she had taken to wearing short white nightgowns to bed, and nothing underneath. I could see why she liked them. They looked much more feminine than those huge shirts. They left her arms, shoulders, upper chest and back bare except for the thin shoulder straps. The bottom hem fell almost halfway down her thighs. The nighties would have been modest enough except they were too sheer.

She couldn't have been aware of just how sheer they were, and I couldn’t bring myself to tell her; I was enjoying the view far too much. When the sun came through the bathroom window in the morning I could clearly see her ridiculously sexy puffy nipples, her navel and her dark pubic mound, along with the outline of her beautiful form. And the way those pert breasts jiggled every time she moved made me burn with desire. Visions of her in her new nighties filled my private fantasies.

Her body wasn’t the only attractive thing about her. Rebecca had a wholesome, innocent looking face, probably because she had fine features but just a little too much body fat to meet the Hollywood aesthetic most teens aspire to. It was evenly distributed, making her cheeks full and leaving her body shapely and appealing. I absolutely loved the way she looked, and I couldn't stop myself from pinching an adorable cheek or squeezing her shoulders every chance I got. She tolerated it well enough, considering how annoying I knew she found it. Though she could be gruff at times, she really was almost as angelic on the inside as on the outside.

Anyway, she stood there in her nightie brushing her teeth, her straight brown hair held back loosely with a large clip. I stood behind her, looking at her through the wall length mirror and appreciating the contrast the pure white nightie made against her pink skin as I said, “Becky, I need to pee badly.”

"Go ahead if you can't wait,” she mumbled through the toothpaste and brush. She mumbled a lot more gobbledegook, and somehow I actually understood her; she didn't want the toothpaste to drip onto her nightie so she was staying in front of the sink until she was done.

We both knew I should have kicked her out, that my need trumped hers. And we weren’t allowed to use our parents’ bathroom, even as an emergency option. We also knew our parents would never be okay with either of us peeing in front of the other, but something came over me and I decided to take her suggestion.

I couldn’t face my back to her because there wasn’t enough room between the toilet and the counter, and if I just peed like normal she would have a perfect side view of the whole thing. I compromised by rotating myself as much as the counter would allow (around thirty degrees), hoping that would be enough to shield myself from her view. Having attained the optimum position, I freed my semi-hard cock from my boxers and let loose.

It felt thrilling to whip my cock out into the cold air with Rebecca standing right there, a few feet from me. Before I could finish peeing my cock hardened to full mast and I had to back away from the toilet and aim it downward to keep the stream of urine aimed into the bowl. I hadn’t planned for this. I glanced at Rebecca in the mirror and saw her look directly at my erection through the mirror and then into my eyes, smirking through the toothbrush moving in her mouth.

I felt my face flush with embarrassment as I remained stuck there with my erection on display until my full bladder emptied sufficiently to stand closer to the toilet. It took a long time, and Rebecca seemed highly amused as she watched the whole thing.

Finally done peeing, I stuffed my erection into my boxers the best I could while Rebecca spat out the toothpaste and filled a cup with rinse water. She stepped aside to let me wash my hands, eyeing my boxers the whole time with a smirk on her face once again.

I turned around to dry my hands on the towel hanging from the bar on the wall and looked at the state of my boxers. Though still contained in the boxers, my erection was pointing straight out, tenting the boxers and pulling the flap apart, leaving my cock almost completely visible from the vantage point Rebecca had moments ago. Holy cow, that’s what she was staring at; my erect cock had still been on display.

Still thoroughly embarrassed, I turned around to apologize to Rebecca for my hard-on when I was assaulted by her body as she suddenly bent over and backed up to rinse the toothpaste from her mouth. Her barely covered ass bumped into my groin, pressing the boxers against me and forcing my cock through the flap, between her legs and against the soft, moist cleft of her sex.

The flimsy cotton of her nightie failed to impede the motion of my cock and did little to insulate us from the sensation of our sexes as they slid together. My hands automatically flew to her hips and started pushing them away, causing more exquisite pleasure. Rebecca reacted by opening her eyes wide, clenching her soft thighs together and saying, “STOP!”

Looking Rebecca in the eyes through the mirror, I watched my sister’s expression change from shock to lust, and finally to mortification. Even so, we never broke our gaze. My own feelings matched hers. Our chests were heaving.

“What the hell just happened," I said lamely. She just looked at me, mortified and highly aroused, just as I was.

“Why did you clamp your legs together?” I said.

"I don't know,” she said, “I got surprised.” She spread her legs and feet apart, causing her labia to give my cock another moist caress. She looked like she moaned but she let out no sound. “Okay,” she said, “you can back away now."

“Okay,” I said. I held her hips firmly in my hands and began moving away from her again, acutely aware of her lips hugging me. Rebecca’s mouth flew open at the sensation. Soaked with her secretions, the paper thin, gauzelike cotton practically disappeared as Rebecca’s vulva grabbed and sucked at my escaping cock.

The tip of my cock finally reached her vagina and the extra wetness was too much for me to take. All control temporarily gone, I moaned and bucked my hips forward uncontrollably, wedging the head of my cock firmly in the entrance of her vagina. The soaked material of the nightie remained between us, stuffed inside her along with the head of my cock. Her labia stretched around me just past the head, gripping me further and causing the head to swell. I felt as if I were knotting my sister like a dog.

"Ohhhhh fuck," moaned Rebecca. Her surprised face started writhing with lust. She held my gaze.

"AHHHH," I moaned as the cum shot out of my cock, directly into her wet vagina. Porous and pressed tightly against the head of my cock, the nightie was useless as a barrier. I bucked uncontrollably, pushing a little further inside her as spurt after spurt flooded her soft cavity.

Overcome with lust, my eyes burned into hers, witnessing her renewed shock, pleasure and embarrassment until I calmed down somewhat. I became mortified again as my sanity started returning.

"Oh my god, I'm so sorry, Becky,” was all I could say.

She closed her eyes. “Calm down, let’s just try to disconnect,” she said. She was talking to herself as much as she was talking to me.

Hips still held firmly in my hands, I looked down to see my cock pushing the nightgown inside her. I could see through the material to the dark hair of the labia that gripped me. “Ohhh god,” I said, overwhelmed again with the sight and the sensations my cock was experiencing.

“Try and take it out,” she said, her eyes still closed. “When you can,” she added, recognizing my plight.

I couldn’t believe my sister just gave me permission to keep my cock in her pussy! I knew she was only being understanding, but some part of me took it another way entirely. My erection wasn’t abating any time soon.

I finally regained control over myself and managed to pull out and away from her. I went back to the toilet and sat there trying to control my breathing and calm down, cock still sticking up out of the fly of my boxers. Rebecca rinsed out her mouth and then came and sat across from me on the floor, knees bent and feet crossed, staring at my cock.

"Well,” I said, “your nightie didn't get toothpaste on it, so that's good, right?" I couldn't help pointing out the irony of the situation.

She looked me in the eyes. “No, no toothpaste, just a ton of your cum. You came inside me. A lot. I can feel it leaking out, right now.” She looked sad, and then serious. "No one can ever find out about this, ever. Promise me you will never tell anyone. No one would ever understand this."

"Okay, no problem, no one will ever know. Don't worry, Becky, I would never…” I said.

We sat like that in silence for a moment. Then Rebecca rested her elbows on her knees, set her chin on her knuckles and looked at my cock again. She spoke softly, "You know what's really fucked up?"

"What?" I said.

"I'm actually disappointed," said Rebecca, still softly. "I'm disappointed that things went as far as they did and I didn't get more than a few moments of pleasure from it. I'm jealous that you had an orgasm and I didn't. I feel sorta cheated. How's that for fucked up?"

"I know how you feel, actually," I confessed. "This was an accident. Of course it couldn't be satisfying the way an intentional sexual experience would be. I never thought anything like this would ever happen. Of course you’re disappointed. I feel cheated too."

After a pause, Rebecca met my eyes again and spoke. "You want to do anything about that?" Her words hung in the air. Her expression was grave and uncertain.

"You mean have sex?" I looked at her and she looked at me. I swallowed. Our excited breathing was obvious to both of us. "We wouldn't have to feel cheated any more if we did," I reflected aloud.

“No, we wouldn’t,” she said, looking at my cock and back into my eyes.

“I can’t believe we’re seriously considering — I mean an accident is one thing but this would be different, me and you together…” I said.

“Yeah, that would be so wrong, so…” she paused.

“Hot,” we both said simultaneously. Our chests were heaving. Our eyes kept moving to each other’s bodies and then returning to each other’s faces.

Cock rock hard again, I got up, dropped my boxers and stood right in front of Rebecca. She looked at my cock just inches from her face.

“You’ve been eyeing this quite a bit today,” I said, watching her staring at my cock and balls.

“Yeah. Your dick looks beautiful,” she said, also breathing heavily. She licked her lips and bit down on the lower one.

“You want to touch it?” I said.

She ran her fingers over my circumcised cock, feeling its warmth and softness. She grabbed it firmly around the base, squeezing softly and studying its veins and large mushroom head. I couldn’t believe she was doing this to me. This was my sweet, adorable, angelic little sister, and I was watching her holding my cock — not just any cock, but her own brother’s cock. This was so wrong, and I was so turned on.

“Look at that, Becky,” I said, “you’re holding your brother’s cock in your hand. That’s so wrong.”

“Yeah, so wrong,” she said, eyes glued to what she was doing to me.

“Everyone thinks you’re such a good girl, but we know the truth, Becky, don’t we?” I said. “You like holding your brother’s cock, don’t you?”

“Yes,” she said, trembling with excitement, watching her incestuous act.

“Say it Becky, I want to hear you say it. Say how much you like holding my cock in your hand.”

“I love holding your cock in my hand,” she said, stroking me.

“Your brother’s cock, Becky, say it,” I said.

I love holding my brother’s cock in my hand,” she said,

“You know that’s so wrong, loving your brother’s cock,” I said, and I ran my hands greedily over her shoulders and upper arms, feeling her perfect bare skin in my hands.

“I know it is but I don’t care, I want my brother’s cock,” she said.,” and she kissed it just under the head.

“Ohh yeah Becky, taste my cock,” I said. Her lips were soft and moist. She gave it a lick, then she wrapped her lips around the head. Her lips caressed my shaft while her head moved from side to side. I watched one of those angelic cheeks bulge with the pressure of my cock head against it as her tongue slithered over my sensitive skin.

She lifted her mouth off of my cock long enough to say, “don’t stop touching my body,” popping it back in her mouth afterward.

“You like it when I touch your body, Becky?” I said.

“Yeah, I love it David,” she said, getting right back to work on my cock again.

“Say it, Becky,” I told her.

“I love it when my brother touches my body,” she said, looking me in the eyes. She was panting. “I want my brother to touch me everywhere. I want my brother to fuck me.”

“Stand in front of the mirror again, Becky,” I said. She walked into position and looked at me through the mirror as I stood behind her. Her eagerness was apparent.

Our eyes met through the mirror and I ran my hands over her bare shoulders and arms and then up her torso and over her breasts, feeling her through the nightie.

“I’ve dreamed of doing this,” I said, looking at us in the mirror as I ran my lips behind her ear and down along her neck. “I can’t believe I’m getting to do this for real.” My breath was ragged with excitement.

“Really?” she said, leaning into me. “God, David, you should have told me, I would have let you. You’re so hot, I fantasize about you all the time. I started wearing these see-through nighties to try and get you to notice my body.”

“No way, you did? Damn. Well it worked, Becky. I always look forward to early mornings and late nights because I get to see your beautiful body through this flimsy material.” I traced my fingers over her nightie-covered breast, running them over her nipple. “I always felt like doing this.”

“I want you so much, David, you’re driving me crazy. Touch me, big brother, touch your little sister, do anything you want to me.”

I lifted her nightie up over her head and arms and threw it on the floor, exposing her naked body to me for the first time.

Her body was as lovely as I imagined. She was fit but soft, just like her arms and legs, with just a touch of extra fat around her navel. Her breasts were a little smaller than I imagined, just pert handfuls, probably a B cup, with puffy nipples that were a slightly darker pink than her lips. Below her sexy tummy was a dark patch of pubic hair that was cut short, revealing the line of her cleft.

I pressed my hard cock between her soft buttocks, bending us over the basin.

“Ohh, yeah, put your cock on my ass, David,” she said, humping against me. That’s so wrong, big brother, rubbing your hard cock on your little sister’s ass.” I loved Becky, she caught on so fast. Apparently we were both acutely aware of just how crazily wrong our incestuous behavior was, and that fact excited us both just as much as our bodies excited each other.

“I love rubbing my hard cock on my sister’s soft little ass,” I said, humping back against her.

“Lay your cock on my pussy like it was before, David,” she said, spreading her legs and planting her feet again, her hands holding onto the counter she was bent over. I did just that, bucking my hips back and forth as soon as I felt my cock sink between her labia and slide against her wet vulva. Her mouth hung open and her brows knitted, and then her jaw clenched and her lips pouted as she humped her pussy against me, complimenting my own efforts to rub our sexes together. Her breath was ragged and she was shaking. I felt our sexes get wetter as we started sliding against each other more easily.

“Please, big brother, slide your cock in my pussy and fuck me,” she said. “Your little sister wants to feel your cock inside her pussyuhhhhh…” The head of my cock was entering her before she finished getting the words out, and she moaned and shook. Turned on as I was, I was concerned for my sister.

“Are you okay Becky? You’re shaking,” I said.

“Yeah, I’m fine, don’t stop, David,” she said, her voice shaking too. “This is the best moment of my life, I’ve wanted you so muuuuch. Slide your cock all the way inside me and fuck the shit out of me.”

I slid my aching cock further into her wet sex and out again, loving the feel of her soft wet walls enveloping me. Her outer lips stretched around my shaft, gripping and kissing the circumference of my cock further and further down until they wrapped around its base.

Rebecca moaned loudly as the skin of my shaved balls met her clit in a moist kiss. “Yeahhh, you’re buried inside me,” she said. “How does it feel to bury your cock all the way inside your little sister? I love it when my brother fucks me in the bathroom.”

I started pulling my cock out of her a bit and pushing back in again, looking at her completely naked body. “You’re an angel, you’re so fucking perfect, I don’t ever want this to end,” I said.

“That feels so gooood, David, don’t stop, don’t ever stop,” she said. “Love me, fuck me, cum in me. Please cum in me, David. Fill your little sister full of cum. I want my big brother to fill me full of cum.”

My thrusts grew longer and faster. My balls crashed into Rebecca’s clit and her soft ass crashed against me with every thrust. Wet slapping sounds filled the small room as I pounded my cock into her. I didn’t even know if she was on birth control, and in that moment I didn’t care. I wanted to fill my sister full of my cum, my seed, no matter what.

Rebecca’s breasts hung in cones which shook like Jell-O as I pistoned my cock in and out of her, hard and fast. We both marveled at the sight in the mirror: a brother and sister urgently fucking each other’s brains out in their bathroom.

I looked down between us to see my cock spearing her and the sight was incredible. I had to share this with her. I pulled out of her and turned her around. “Sit on the counter, you have to see this,” I said.

I helped to lay her on the counter with her butt at its edge, propped up on her elbows with her shoulders against the mirrored wall. I spread her bent legs wide with her feet resting against me so her pussy was on display.

“Look at your big brother’s cock entering your pretty little pussy,” I said as I pushed inside of her. Grabbing her thigh, I put my thumb on her clit and rubbed her in little circles while I sawed my cock in and out, watching her labia hug my shaft tight.

We watched our forbidden union. Mouth open, Rebecca looked up from the depraved sight and into my face.

“What do you think of incest, Becky?” I said. “It’s so wrong, isn’t it?”

“So wrong,” she said.

“A brother and sister who do that, they must really love each other a lot,” I said.

“Yeah, so much,” she said.

“They must be really hot, to find each other so attractive they want to fuck,” I said.

“Yeah, you’re so fucking hot, David, you need to cum inside me! Fuck me, fuck me big brother!” she said, almost ranting.

We were two wild animals, mating like our lives depended on it. I have no idea how long we fucked like that, but I’ll remember the feeling forever. I think she orgasmed after some time but I couldn’t be sure because I was so far gone I was cumming. Cumming deep inside my little sister’s pussy. My hands were all over her, from her legs to her breasts, and my face was against hers, noses anchored together, kissing hungrily. I wished it would never end, wished I could keep shooting my seed inside of her endlessly. I wanted to make her mine.