It Was in the Genes - Cover

It Was in the Genes

Copyright© 2024 by Kin Asdi

Chapter 4

Romantic Sex Story: Chapter 4 - What do you do when your sexy sister, Cindy, is in love with you? Casper, a true nerd at heart, finds out she is adopted and realizes he has fallen for her as well. The dilemma of their ‘forbidden love’ forces them to find a bearable solution. Will they succeed to have a happy life after all?

Caution: This Romantic Sex Story contains strong sexual content, including Ma/Fa   Fa/Fa   Consensual   Romantic   BiSexual   Heterosexual   Fiction   Brother   Daughter  

The next morning, I found myself pressed against the wall by Cindy. It was funny to realize she had claimed the whole mattress for herself. There she was, lying spread eagle and it was hard not to blatantly roam my hands over her beautiful body. She had been fitful all night and I was sure bad dreams were the cause. With some acrobatics I managed to climb out of the bed without waking her.

I stepped into my jeans and pulled a thick sweater over my naked torso, ignoring the itchy wool on my bare skin. My plan was to bring my sister a simple breakfast on bed. Nothing too fancy, but enough to last a few hours. It didn’t take me long to fill the tray and with a spring in my step I carried the food upstairs. I turned into my bedroom where I found an empty bed. The duvet was neatly spread over the mattress and the floor was empty, including the ball of tissues. “Cindy, where are you?”

“In my room,” her muffled voice echoed over the landing.

Her room’s door was left ajar, ready for me to push it open with the tray. Slowly the door opened, revealing the most mesmerizing scene I’ve ever seen. There were lit candles everywhere and together with the small lights the room was bathed in a pleasant amber glow. My breath hitched when I saw Cindy sitting on her bed. She was wearing the sexiest negligee I’d ever seen; the black see-through lace fabric was tied together under her breasts, which revealed parts of her toned stomach and hips. It didn’t hide her plumb nipples and her lace undies looked spectacular. I looked up and saw her angelic face framed by her wavy black hair.

“Wow,” I whispered, “You look amazing. I like the hair.”

“You’ve passed the test,” she purred, “Always try to compliment a woman on what she has changed.”

I snorted as I sat down next to her. “I didn’t know I’m scrutinized by you.”

She huffed with a naughty smile etched on her face. “You wanted to know how to win over a woman’s heart, so you better start to pay attention.”

“Yes, Ma’am.”

For that remark I earned a painful thump against my shoulder, as she growled, “It’s because you brought breakfast, I’ll forgive you for making the utmost disappointing mistake; never make a woman feel old. Do. You. Understand? You can address me as mistress or just something less strict like baby or sweetie.”

“You want some coffee, babes?” I deadpanned.

“Oh, yes,” she purred, “I’d love some.”

I handed her the mug and said, “I like the candles.”

“Uh-huh,” she said huskily and after she’d taken a sip she continued, “It’s just an example how to make a room ready for a romantic evening. It definitely helps bringing a woman into the right mindset.”

I stared at her beautiful blue eyes and conceded as I traced the hem of her negligee, “Your wearing this, brings me into a heightened state of awareness.”

Cindy slowly put her mug down on the tray and as she looked at me, longingly, she whispered, “Maybe we should pick up where we’d stopped last night.”

In one fluid movement I put down my cup as well and placed the tray down onto the floor, next to her king size bed. Within a few moments my jeans and sweater followed suit and totally naked I crawled towards my sexy sister. Her hungry smile was what I so adored and I ached for kissing those soft lips again.

“Oh gosh,” she gushed with a trembling voice, “You’re on fire, aren’t you?”

I gently nuzzled her. “You should know by now that men are visually stimulated.”

She giggled. “The sexier the better?”

I stole a steaming hot French kiss before I answered breathlessly, “Hell yeah. You look fucking hot.”

With glee she handed me a ribbon and purred, “Just pull, sweetheart.”

I admired the soft lace and as soon as I pulled at it, I saw one of the two bows, positioned between her delicious tits, getting smaller. The magic moment was there when the negligee slowly slid open, revealing her marvelous body. From that moment on I just let my instinct go and traced her divine body down with tender kisses.

“Oh god, Casper,” she breathed, “what are you doing to me?”

Everything felt so good until I reached the itchy black lace of her undies. I panicked because I had never been so close to a pussy. She noticed my hesitation and gently moved her hands through my hair.

“Just keep on going down,” she encouraged me, “choose one of my legs and go up again on the other one.”

It was strange to kiss something else than her unblemished skin but soon enough I reached the silky softness of her inner thigh. I was addicted to the velvety feel of her thighs, and I decided to jump over the other leg before I had reached the knee. It was such fun to climb up her body again, slowly heading up for her warm crotch. I was totally flabbergasted when my lips touched the soft and very slippery flesh of her soaking wet pussy.

“Now it’s time for your first lesson,” Cindy said huskily.


My back, knees, and elbows were still hurting when I woke up. The pleasant faint scent of Cindy’s perfume lingered in my nostrils, which confirmed the other differences I was suddenly aware of; I was lying in her bed which was much softer than mine. It was strange to feel my stomach being warmed by Cindy’s back and that my free hand was cupping one of her breasts.

Only then the memories flooded back into my brain, and I smiled when I remembered my small success. In the beginning my feeble attempts were disastrous but I had to admit it could have been worse. She kept her calm and patiently guided me through the steps of sapphic pleasuring. It was a good learning experience and even for her; I was super proud that I’d managed to find her G-spot. It definitely ramped up her state of arousal but the only regret I had was the fact she’d taken over my attempt to get her off and started to rub her clit.

The only thing I could do was keep on gently rubbing the vague squishy ridge in her sopping wet channel and pay attention to what she was doing with her fingers. It was an unreal experience when she finally came. My fingers were squeezed out of her pussy, and she moaned loudly for a long time. Her legs were shaking and every time she pushed her whole hand against her vagina, she bucked her hips. I knew women had a much longer climax, but I never thought it would be so powerful.

After her high we cuddled, made out for a few minutes, and then we fell asleep.

My cock was at full attention again, which had started to feel quite comfortable, like it was just a normal thing to happen. It had nested itself between the soft cheeks of Cindy’s delicious rump. I gasped softly when she squeezed my rigid member by tensing the muscles in her bottom.

“Hmm,” she murmured lazily as she turned away from me, “Tempting but I need to have a pee first.”

She still looked ravishing, even in the disheveled state she was in. Her wild hair made her look like an Amazonian who would eat men for breakfast. A minute later she appeared again, looking like a heavenly resemblance of Aphrodite.

She slowly pulled the duvet off my body and straddled my thighs, leaving just a few inches between her toned stomach and my throbbing girth. “Reward time,” she cooed.

I chuckled nervously because I desperately wanted her to do it differently and replied, “I would like you to tease me. See how long you can keep me from coming.”

Her eyes grew bigger but then her naughty smirk reappeared. She slowly moved her body towards me, squashing my painfully hard cock between our stomachs. Her breasts were like two soft pillows when she rested her elbows next to my chest. We were too far away for a kiss when she purred, “Oh I like that idea.”

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