Big Sister's Birthday Surprise - Cover

Big Sister's Birthday Surprise

by Sonarflash2026

Copyright© 2026 by Sonarflash2026

Incest Sex Story: Better than any wet dream, I'm startled awake well before dawn, then offered the most unbelievable birthday present ever!

Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa   Consensual   Romantic   Heterosexual   Fiction   Brother   Sister   First   Oral Sex   .

Much too bright, bedroom lights came on with a vengeance, stabbing through eyelids, fracturing an erotic dream.

“Happy birthday, little brother,” my big sister Alexa chirped merrily. “Now You’re legal.”

I groaned. The night before, gathered for the special event, my ten-year older big brother and his gorgeous, flirty wife, my dad, two reprobate uncles and their lovely, rather sexy wives tried to get me hammered with a pre-birthday, introduction to being of legal age drink fest. Fortunately, I surreptitiously dumped most of the proffered tequila shots and, with relief, prevented a subsequent hangover.

Still, with head pounding, this was a morning I didn’t want to face. Worse, my lovely, annoying older sister woke me from a nearly wet dream before I messed briefs and sheets, probably sparing me the embarrassment of sticky linen.

Grumpily, I rubbed sleep crusted eyes, looking up at Alexa, frowning at the pretty bane of my existence. Almost two years older, a hell of a lot smarter, her olive complexion completely free of acne blemishes, my sister was a five foot short, ninety-five pound bundle of gorgeous energy. Not only was she beautiful, her long fall of hair was a dark, shimmering chestnut, so different from the dirty blonde I’d inherited from my parents. I hated my older, brilliant sister ... and of course, couldn’t help loving her,, and much to my continuing frustration, I’d had a terrific crush on her since I was twelve.

Over the past seven or eight years, every time Alexa went out on a date, something inside snapped. I roiled and seethed with hostile energy. I could Invision her with each guy, their tongues in her mouth, or their hands squeezing her small, perfect tits. Any thought of them doing more left me boiling with impotent rage. More than a few times through my difficult teens, I plotted various means of dealing with her shitty boyfriends when she came home crying from heartbreak. I’d come up with creative ways to off the bastard. One of my hobbies was pyrotechnics, and, though dangerous, making nitro was fairly easy. Unfortunately, I’d be a suspect, get caught, and prison was not an inviting prospect. Now, at twenty-one, I still hadn’t gotten laid, and didn’t want to become some guy’s prison bitch.

The November afternoon before my birthday was grey and dismal. The eleventh of November promised Clouds and rain. After dark on the tenth, scudding clouds obscured the moon.

Regardless of the weather, family had gathered for the event. The sky was leaden grey. Over the past week, with our spacious lakeshore retreat crowded with aunts, uncles and a few older cousins, my mother couldn’t help but regale everybody with tales of my planned, post-war, terribly difficult birth. I had been a huge, nine pound surprise to a woman barely measuring four foot eleven. No thanks to those hours of hard labor, I was Born on the eleventh day of the eleventh month and wailed my first breath at exactly eleven o’clock Pacific standard time. Repeatedly noted by family, that auspicious coincidence seems to have imbued my arrival with obscure metaphysical and memorial significance. Thus, a gaggle of relatives had descended to welcome my entrance into a peculiar sort of manhood at twenty-one, Canadian style, if there was such a thing.

The family gathering wasn’t surprising, since my grandfather managed to survive WWI in the trenches of France without getting gassed, returning home in one piece a few months after that date. The eleventh gained significance well beyond nineteen eighteen. Later, in nineteen thirty-nine, with the outbreak of war, our father enlisted, ending up in the army, serving in the Royal Canadian Engineers. His volunteer service resulted in a year of training in Northern British Columbia. After that, he was shipped to England. Not long after, he received commando training in Scotland. Then, after two more years training in Britain, he landed in Normandy on June sixth, nineteen forty-four. Yeh, I’m proud of that.

Our dad fought from the beaches of Normandy through to Germany and was wounded three times. I wasn’t even a spark in the eyes of either parent. I wasn’t even a spark until more than a year after my father returned from Europe. Then, on eleven, eleven of nineteen forty-seven, yours truly burst on the world and complained loudly. My mother told her mother, “that one almost killed me ma!”

I rubbed my eyes. “Shit!” I growled, squinting up at the petite beauty who seemed to fill my every waking thought. “Lexy! What the fuck?”

“Happy birthday boob,” she replied, bending over, planting a delightful smooch on my lips. I couldn’t help but notice the points of her firm little breasts through my T. At first, I thought she had to be naked. Jolted wide awake, I focused in on my sister, then blinked several times, still remembering the wet-dream vision of a seductive, naked water nymph. Alexa wasn’t exactly dressed ... and not exactly naked. My little older sister with the perfect, petite bod and perky little breasts was wearing a sheer pink nightie that did little to conceal her small, conical breasts, let alone the firm pressure they were exerting on my chest. One glance down over her body provided a glimpse of equally sheer pink bikini panties and the dark shadow of her bush. I wondered absently how much they were showing of her lean, round buttocks.

Her soft kiss a lingering distraction, I managed to hug Alexa back with one arm, barely managing to vocalize through a dry, congested throat, “God, I died in my sleep and angels are really hot!”

Alexa gave her little girl giggle. “You’re just a big tease!” she said, pulling back, tossing a long, unbound fall of dark brunette hair.

“So, little brother, what do you want for your birthday?”

Before reason, filial caution or inhibition had a chance to kick in, I spoke. “You, naked, in bed with me.”

Alexa gasped, actually jerking, head rearing back, her big chocolate brown eyes going very wide, a hand flying to her mouth. “Darryl?”

With a groan, I realized what I’d just said. “Sorry sis,” I muttered. “Real sorry. Inappropriate. That ... kind of slipped out. Blame it on the dream I was having.”

My brain was still fogged, though that wasn’t an excuse. Part of me didn’t want to forsake the pornographic dream-images of a naked, nubile nymph swimming in a spring in a forest glade. There was no internal denial that the face and naked breasts of that nymph had been those of Alexa.

Alexa was my secret crush. My sister had been in most of my wet dreams since puberty. Year after year, as frustrating adolescence kept stirring hormones, Alexa’s face kept replacing those of any Playboy pin-up, or real girlfriend, even in the fantasies and throes of masturbating.

“Me?” Alexa squeaked. Her big brown eyes stared right into me. “Naked? You ... think of me that way Darryl? Seriously?”

I groaned, squeezing my eyes tight shut, throwing an arm over them.

“Sorry!” I wheezed out. “Blame that on an explicit, waking dream. Naked nymph in a forest pond. She had your face. They always have...” I caught myself and let out another embarrassed groan.

For a moment, Alexa said nothing. My eyes remained shut, my arm covering them. I hoped she would just go away in a petulant huff. Birthday or not, I knew that particular wish would never be granted.

“A nymph?” Alexa said with a hint of uncertainty. “Naked, and with my face? They always have my face? Is that the reason for the woody tenting your blankets Darryl?

I groaned even louder. “God, sis, do you always have to be a pain in the ass? Torment me all the time? At every opportunity? Yeh! I was having a sweet, kinky dream! I was turned on. Okay? If you hadn’t jarred me awake, I probably would have cum in my sheet.”

Only a moment after I’d blurted all that out, my entire body arched with shock. Alexa’s hand settled on the tented blanket, then she was squeezing my erection.

“It’s okay Darryl,” she whispered, fingers very solidly gripping my shaft. “I understand. Sorry I broke into your dream.” Still gripping my cock, her fist began to move. “Maybe ... I can make it up to you?”

“Lexy!” I gurgled, barely managing speech, suddenly understanding. “You ... You can’t do something like that! It isn’t right! you’re my sister!””

“Sure we can. Besides, Darryl, I’m only a half sister,” she murmured with a definite note of sadness that did nothing to relieve the pressure of her fingers on my dick.

“What? I said, more than a bit confused.

“Mom got pregnant with me before dad came back from Europe.”

For nearly a minute, my mind was in stasis. I couldn’t quite process what my sister just told me. The hand firmly squeezing my dick I could understand. I just couldn’t accept that my older, pain-in-the-ass sister just told me our dad wasn’t her father.

“Half?” I said, bewildered.

“Do the math boob,” Alexa replied.

I blinked, meeting her big eyes, drowning in them for a moment. “The math?”

She giggled. “You were planned, little brother. I wasn’t.”

“Christ!” I thought, in that moment and for the first time, realizing that my father remained with our mother in spite of her being pregnant by another man.

I’d never thought to ask when dad got back to Vancouver after Germany. Alexa also had her birthday in November, just six days after mine, but she was born in nineteen forty-five.

“Fuck!” I murmured, staring wide-eyed up at Alexa, surprisingly no longer distracted by the hand squeezing and working my boner through the covers. For the first time, I understood why my sister was so dark, with rich chestnut hair, olive complexion and dark brown eyes. I was more like dad, showing a pale Norwegian heritage, with my dirty blonde hair and blue eyes.

It was a shock to realize that our mother had been unfaithful, impregnated by another man before the war was over. The way her and dad seemed glued at the hip certainly didn’t fit.

“Darryl?” she said quietly. ““Would you really?”

“Really what?” I managed without squeaking like a girl.

“Like me naked in bed with you?”

“Oh God!” I moaned, envisioning that possibility after years of fantasizing. “Are you just teasing me again? A real nasty birthday tease?” I blurted with some heat.

“No, just asking,” she replied, softly planting another kiss on my mouth. For the first time ever, the tip of her tongue darted between my lips, adding an unmistakeable invitation. That made my eyes shoot open. Her big, chocolate brown beauties were staring right back, reaching into my soul. There was a powerful longing there. I opened to her and her tongue slowly invaded my mouth. Our eyes still open, staring into each other, I could see love, hope and fear.

“God, yes!” I breathed around her lips. “I’ve wanted you forever!”

“I think I’ve always known,” she murmured back, her lips and tongue tickling mine. “That’s why I saved myself for you.”

“Saved?” My sleepy, crusted eyes blinked rapidly. “For me? Saved?” Her words and the implication struck me like a bolt of lightning. Alexa was just five days shy of being two years older. She was brilliant, already having earned her bachelor’s degree in science with honours, and a masters degree in microbiology. In six more days she would be twenty-three, and was already working on a doctorate. That my gorgeous sister hadn’t gotten herself laid in all those years seemed impossible. Not a little stunned, I ventured, “a virgin? Really?”

I could feel her lips smiling against mine. “I am, and my cherry is your special birthday present, If you want?” she replied with quiet, slightly humorous formality.

At that, something snapped inside.

“Lexy, your dad ... isn’t mine.”

She giggled. “Boob, I just told you that.”

“You’ve known?” I said almost accusatively.

Alexa settled her chest and more on me and huffed out an exasperated breath. “Darryl, you really need to wake up and smell the roses. After being alone for all those war years, and hearing about the last, terrible battles in Holland and Germany, and not hearing from dad for months, she was frightened, and all those years of loneliness did a number. Their neighbour was this elderly Italian guy who had been constantly supportive. A friend. One evening, she ended up crying on his shoulder and it happened. They did it on the couch and she got knocked up and I’m the result. You, on the other hand, are the fruit of our parent’s reconciliation.”

“But, dad loves you!” I stated in protest.

Instead of giggling, she laughed. “Of course he does. I’m his only daughter, and I work hard to deserve his love, even though it wasn’t his sperm that made me.”

That slammed my waking awareness. Despite low grades and laziness, I wasn’t stupid, granted, not a genius like Alexa, but sometimes I could be a bit slow on the uptake. I took long, slow, deep breaths, trying to quiet my mind and raging hormones.

“Of course I want your cherry,” I whispered. “I love you sis. God, you really saved yourself for me? But, what if you got pregnant?”

“Slim chance, since I’ve been on the pill for years ... planning ahead, so to speak. Besides, genetics is a crap shoot at the best of times, so I wouldn’t mind having your babies.” That floored me, but I wasn’t given time to recover. She kissed me again, this time with lots of tongue action, her hand sliding under the sheet to grasp my tool, at which point She let out a loud squeak that fortunately was swallowed by my mouth.

“God, you feel huge!”!” she whispered anxiously.

“What?” I said, dumbfounded. “I’m small. That’s only six inches long when I’m hard! I sure didn’t inherit dad’s big cock. Christ, there was a guy in our highschool gym class I saw when we were showering. He must have been nine or ten inches slack. Now that’s big.”.”

“Whatever. You feel very large, and very hard,” she murmured. “And, I’m very ... small.”

“Well, I’m glad to be appreciated sis. Maybe it’s because you have tiny hands?”

She giggled. “Maybe. I’m tiny everywhere.” Her small hand and slender fingers tugged and began pumping me.

In seconds, I really was hard, feeling amazed, and curiously flattered. “You ... aren’t exactly naked.”

“I’m also not a nymph in a forest pond,” she reposted, withdrawing her hand, pulling back sheet and blankets. “Move over.”

“Sis, what about the family? All the relatives?”

“Boob, it’s three in the morning. Everybody was plastered. They’re all passed out and snoring.”

“Turn out the lights!” I urged as her knee settled, one bare, Warm and silky leg brushing my hip.

Alexa shrugged, switched on my bedside lamp and got up, crossing to the wall switch, killing the brilliant ceiling lights. I watched her all the way, seeing most of her through the filmy nightie, and momentarily lost in admiration of the exotic view.

“I still want to see what I’m doing,” she informed me, gesturing at the glowing bedside lamp, sliding in beside me, tossing back the covers, exposing my groin and thighs.

“Ouch!” she breathed. “He’s pretty, but I worry that he might not fit.”

I hardly noticed her comment about my dick. Light from my bedside lamp was shining through her pink silk nightie, clearly illuminating something I’d never seen before. Her breasts were tipped with small nipples that were almost black. The areola were a shocking contrast of of deep red. The shape of one breast was clearly defined, the light revealing a high, pointed cone. One glance and I realized she must only wear a bra to conceal the peaks. They sure as hell didn’t need any support.

Alexa lay down and I missed a chance to examine the front of her panties.

“If you don’t want to fuck, that’s okay,” I said, trying to not sound disappointed, happy enough that my sister was actually in bed, her luscious little body snuggling up against me.

She pinched me hard with her free hand. “I am going to make love with you, not just fuck!” she hissed.

“Sorry,” I said on a gasp of pain. “Right. Make love.” I considered that, then grimaced. Just once, at a house party for two, I actually managed to have my dick nestled between the eager, juicy virgin lips of Cynthia Pinnsail, only to cum all over her pussy and the sheet with a premature ejaculation. My dick immediately went soft and that opportunity was lost forever, Cynthia’s laughter scornful and my embarrassment complete.

“You better know, even if I pop your cherry, I probably won’t last five seconds.”

She giggled and kissed my cheek. “You could try for ten, but that really doesn’t matter,” she said with a smile, offering up her mouth for another long, hot kiss. “I can’t get much more than a fingertip in my vagina before it complains. Once will probably be all I can handle the first time, but there’s always tomorrow ... or the next day.” Her lips brushed over mine, then her hand was cupping my face. “Have you ever had sex? Is that why you said that? Is that what happened?

I gave a derisive snort. “Worse. Was right there, and with Cynthia Pinnsail, a virgin hot to do it. Never got inside because I came off as soon as my cock met her pussy. Having her laughing, and running to the bathroom to wash, and me having to strip the sheet kind of spoiled the mood.”

She tittered and slipped me tongue.

“So, my baby brother is a virgin too. Yum.”

We kissed and she worked my shaft with slow, soft strokes for a minute. When I groaned in warning, she stopped and pushed up, two hard little nipples brushing against my bare chest. “ Well, if it doesn’t work this first time, we can keep trying. I want you inside me. I decided last fall, after another shit boyfriend nearly raped me. I want you to become a part of me forever.”

She kissed me again, the passion unmistakeable. She rubbed and pressed those firm breasts against me, that alone stirring my balls near to an eruption. I guess she sensed how close I was and relented.

“What about ... isn’t there ... I mean, virgin blood and all that?”

“Like, duh, I’m not smart enough to plan a seduction?” she said facetiously. “Birth control since last summer. A sanitary napkin, a bowl and pitcher of hot water, a washcloth and towels already here, on the floor next to your bed. You already have a box of tissues. I think that should cover everything.”

‘God, planning is the word! Since last summer?’

 
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