What I Saw in My Sister’s Room Changed Everything

Her hips sped up the motion that moments before had been slow and circular. I was completely lost in her, in the wet heat that bound us together, in the way her weight pressed me down into the mattress. She eased the pace just enough to bring her face close to mine and kiss me with her mouth open.

The taste of red wine came to me from her tongue, and our gasps mixed in that long kiss that didn’t seem to want to end. I grabbed her ass with both hands, squeezing her cheeks to drive her deeper onto my cock, and she let out a rough moan into my mouth. I felt her soaked pussy swallow me whole every time she dropped her hips, felt my dick splitting her open all the way in. A growl escaped me when I felt her contract, that hot ring squeezing the base of me as if it never wanted to let me go.

“You still get me hot like the first time,” she whispered in my ear, her breath ragged. “You’re going to kill me. Fuck me, don’t stop, give me that cock that belongs to me.”

I bit her neck and thrust from below, driving it all the way in with each shove. The wet sound of her cunt dripping around my cock filled the room, mixed with the sharp slap of her ass falling onto my thighs. I sucked one nipple, bit it, tugged at it with my teeth until she cried out and crushed herself against me. I ran my tongue over the other one, feeling the salty sweat on her skin, and she dug her nails into my back.

“Harder, deeper, break me,” she panted. “Put all that dick in me, I want to feel it in my belly.”

I grabbed her by the waist and turned her over without pulling out. She fell face down, ass lifted, and I got on top of her and buried myself in her again in one single stroke. A muffled cry escaped her into the pillow. I put one hand on the back of her neck to push her face down and with the other I grabbed one cheek, spreading her open so I could watch myself go in and out. My cock came out glistening with her juices, the skin of her pussy stretching with every withdrawal, taking me back in to the balls, and she arched her back asking for more.

“Just like that, just like that, don’t stop,” she moaned. “You’re splitting me open, fuck, it feels so good when you shove it in.”

I wet my thumb with her own slick and pressed it against her ass, pushing slowly. She moaned higher, pushed back, and the finger sank in to the knuckle. I fucked her pussy with my cock and her ass with my finger, in the same rhythm, feeling her tremble all over beneath my weight. The mattress creaked, the headboard banged against the wall, and I couldn’t stop watching my cock disappear into her flesh again and again.

The rocking became desperate until a shudder ran through her whole body. I felt her close around me, squeeze me, those spasms gripping my cock like a hungry mouth. She screamed into the pillow, bit the fabric, and I drove into her as far as I could before letting go. I pressed my face against her collarbone and bit her shoulder as the first surge rose from my balls and emptied into her, shot after shot of hot cum. The last spasms slipped from me and I could still feel her contracting around me, milking me dry to the last drop.

Little by little, our breathing calmed. We stayed wrapped around each other, still joined, while I slowly went soft inside her. I felt my cum begin to run down her thighs when my cock finally slipped out, and she let out a soft sigh, eyes closed. Irene didn’t move. She let the heat of our bodies keep each other company while the sweat began to cool on our skin.

“I love you,” I let slip, holding her tighter.

“I know…” she answered.

A tear broke free from one of her eyes and wet my cheek. A sob shattered the silence. I didn’t know how to comfort her. I said nothing: I just kissed her.

At that instant, the baby’s crying brought us back to reality. We both sighed at once, resigned to the fact that getting him back to sleep would not be easy.

“My turn,” I told her.

She got down and covered herself with the sheet, turning over so I wouldn’t see her face. I sat for a second on the edge of the bed, picked up my boxers from the floor, and put them on before going to the next room.

There was the little person I loved most in the world. I loved him even more than I loved her, because he was the result of everything we had shared: years of love, fear, joys, and disappointments. When I lifted him into my arms, the crying stopped dead and the sparkle in his eyes drew a smile from me. My chest swelled and my own eyes dampened too. I rocked him for almost half an hour until he fell asleep again.

It was four in the morning when I went back to the room. Irene was no longer crying and had a peace she never showed while awake. When she was conscious, her eyes only knew how to express two things: excitement when we fucked, and sadness when we lived the rest of our lives.

I didn’t disturb her. I went to the window that led to the balcony and, when I opened it, the murmur of Viña del Mar at that dead hour drifted in. The salty Pacific air hit my face and the view comforted me. I leaned on the railing, lit a cigarette, and let memory drag me backward, to the last decade.

At first everything had been easy. We were two kids who had played with the taboo, thinking it would be something temporary. But when things started to get complicated, we found ourselves trapped by the lies we had built to protect what, without even realizing it, we had already created. We lost the people we loved, one by one, until anguish and loneliness forced us to disappear.

We simply went to the end of the world. Chile became our refuge, the place where you erase yourself from the map and start over from zero. Over time we deliberately lost our accent to fit in better. Once that was behind us, we built a life: decent jobs, new friends, and a relative calm to raise our son. Always, though, haunted by the ghost of what we had left behind.

Despite our sins, fate gave us a healthy child. When the doctor confirmed the pregnancy, the first thing we felt was panic. The most sensible option seemed to be ending it, because of the risk carried by a baby born of two siblings: our shared blood was a ticking bomb. But Irene couldn’t even consider it. I backed her without arguing and we went through a dark, difficult few months. Lucas’s first year was a parade of specialists who, one after another, ruled out the problems we feared most.

Irene was marked by it all the same. Don’t get me wrong: her love for us was unconditional. But the pregnancy scared her so much that I ended up getting a vasectomy to swear to her we would never go through that again. She had suffered more than anyone through all of it, though that part of the story you’ll understand later.

I went back to bed and kissed my sister on the forehead. I lay down beside her hoping to sleep, though I doubted I would. In an hour I had to get up for work.

***

Ten years earlier.

You could say it all started with a mistake. I was in the wrong place at the wrong time.

The afternoon had been exhausting. Having accounting class from two to five, with thirty-five degrees and a classroom full of students, was nothing fun. But things didn’t look so bad: that night we were playing a key match in a tournament and, if we won, we would be two points behind the leader. We had been waiting for it for three weeks, ever since the team from Commercial Institute No. 7 had let a victory slip through its fingers when it had seemed guaranteed. The last-placed team had zero points; our next rivals were on a perfect score.

On paper it was supposed to be a blowout. The unbeaten side went up 1-0 after three minutes and dominated almost the whole match. But no matter how much they besieged the other goal, they couldn’t finish it off. With five minutes left, a poorly cleared rebound ended up at the feet of the bottom team’s lone striker, who, with the speed of his legs, left the goalkeeper flat-footed and chipped it over his head.

From that goal on, the bottom team transformed. They pressed, pushed, and earned a free kick that the same striker headed in at the left post. The match ended in a draw. The leaders, who won their next two games by the skin of their teeth and pure agony, pulled three points ahead of us. That was why that afternoon was our chance to catch them.

But classes still weren’t over, and Professor Marta showed no sign of getting tired. Same as always: she seemed like she never wore out. And she seemed determined to ruin our weekend.

“Well, guys,” she said. “As you know, the first-term exam week is coming up, and part of your final grade is developing a debt restructuring strategy for a private company. You have two weeks to prepare and present it.”

A chorus of sighs ran through the classroom. Marta cleared her throat to regain control before we got lost in complaint.

“You’re going to work in groups of four: two girls and two boys, no exceptions,” she cut in before we could protest. “The cases are on the platform. There are ten files, so you have plenty to choose from. On Monday I want you to bring me the approach you’re going to take, based on the four strategies we studied.”

The bell rang and I went over to my sister. At home there were six of us. Carla, the oldest, who at that time was twenty-two; Esteban, twenty-four; and the twins, Irene and me, nineteen. We didn’t look all that alike, but we had the same eyes and the same hair color. Carla and Esteban lived in an apartment in the capital, two hours from home. Our parents were almost never around: their jobs forced them to travel and they spent whole weeks away. We had been raised by nannies until a couple of years earlier, when we told them we could manage on our own. They agreed on the condition that they hire someone to come clean three times a week.

Anyway, I went up to Irene.

“Want to do the project together?”

“Yeah, like always,” she told me as we left, motioning to her friends to wait for her. “But if you invite one of your friends, make it one who doesn’t act lazy.”

“Don’t worry. Maybe I’ll ask Bruno,” I said to calm her. “And who are you going to invite?”

She looked toward the end of the hallway, where her friends were, and thought about it for a second.

“Sofía or Valeria.”

They were the two closest in her group, and they were a pair of bombshells. Sofía was blonde, with light eyes, firm, well-defined curves; her ass stood out thanks to the volleyball she played, although her chest wasn’t especially big. Valeria, on the other hand, was brunette, with breasts bigger than Sofía’s, a less eye-catching ass, but long legs and a waist that gave the impression you could encircle it with both hands.

Irene glanced at me out of the corner of her eye and said nothing. She had caught me several times staring at her friends, and yet she had never said a word. At first, when I started looking at them like that, she would twist her mouth in disgust. But over time she stopped reproaching me for it. I don’t know whether she didn’t care or decided to ignore it, but she never again showed any discomfort.

“Then I’ll tell one of the guys…”

“Didn’t you say Bruno?” she asked.

“Yeah, though I haven’t decided yet,” I replied absentmindedly, looking again toward the end of the hallway.

“Just don’t pick one of the droolers…” she said, looking at me with something close to pity.

She was right: several of them were unbearable. More than one had hit on my sister, and she had never shown the slightest interest. I looked at her skeptically.

“I’ll see. I’ve got a match tonight, I’ll be home for dinner.”

“Okay, I’ll wait and we’ll order a pizza. See you,” she said, heading off toward her friends.

***

I caught up with the guys and we went for a drink before the match. We were both nervous and eager about what was coming; it was a chance we couldn’t waste. We had been waiting for it for months. But the game was suspended because of problems with the field lights, which delayed the date by at least a week. Around seven, everyone headed home.

I took the chance to ask Bruno if he would join the practical assignment, but he already had a group and complained that I should have told him earlier. I had to find someone else. The best candidate turned out to be Nicolás, who gladly agreed. On top of that, he was one of the few who had never come on to my sister; he had always been respectful.

I got home at seven-thirty and found it silent, which struck me as strange. Normally, at that hour, Irene was on her phone or watching some series. I didn’t think much of it: I assumed she was in the bathroom or locked in her room.

But as I went up the stairs, I began to hear a strange sound coming from the back of the hallway. It sounded like moaning. Instinctively I walked without making a sound, avoiding any creak. I still wonder what drove me to act that way, and I can’t find an answer. When I got upstairs, I saw that her bedroom door was ajar and a strip of warm light was spilling into the hallway. The moans were coming from there.

And they definitely weren’t moans of pain. They were moans. Unmistakably sexual.

I couldn’t help it. Curiosity won out and I moved closer to look.

I found my sister on the bed, completely naked, and the soft light drew a body worth admiring. We had seen each other naked as kids, but that was years before, when we still hadn’t developed. And without a doubt, Irene had developed very well indeed.

Her body had changed; her curves had settled beautifully. For the first time I saw her as a woman and not as my sister. And I was attracted to her as such. I wanted to run my hands over that body, suck on her tits, slide my tongue between her legs until I made her come in my mouth.

Her back was slightly arched, lifting her breasts and leaving her erect nipples pointing at the ceiling. Round, hard, with pink areolas swollen by arousal. Her left hand disappeared between her thighs and moved with a steady rhythm; her fingers went in and out of her shiny, wet cunt, with a wet noise audible from where I was standing. Her thumb brushed her clit with every stroke, and she shivered and drove her fingers back in to the hilt. Her skin gleamed with sweat, and that made her even more appetizing. The only thing I thought, with almost absurd clarity, was how badly I wanted to taste that sweat, and the juices running down her thighs too.

Her mouth was open and, I admit it, my mouth watered. But that wasn’t the problem. The problem was lower down: my cock had hardened until it hurt, tugging against the fabric of my pants. Without thinking, I took my hand to my fly and started massaging myself slowly, feeling my dick throb under my palm, letting myself be carried by a sensation I shouldn’t have been feeling. I squeezed it over my boxers, the tip already wet with pre-cum, and bit my lip so I wouldn’t moan.

“Ahhh, yes, please…” she moaned, faster and faster as she sped up her hand between her thighs. With her other hand she pinched one nipple, stretched it, twisted it, and arched her back a little more with each second. Her fingers went into her pussy with an obscene slosh, deeper and deeper, faster and faster.

“More… more…” she whispered through clenched teeth, biting her lip.

I was still standing there, with an erection begging to get out, five meters from my sister who, by the way she was moaning, was about to come. I lowered my zipper without realizing it and pulled my cock out of my boxers. I grabbed it in my hand, soaked with the fluid already dripping from the tip, and started jerking off at the same rhythm she was using to finger herself. You shouldn’t be watching this. You shouldn’t be feeling this. And yet I didn’t move. My cock throbbed in my fist, harder than I had ever felt it, while I watched her writhe on the bed.

Just as she reached the edge, stretching out one last moan, her legs trembling and her cunt gushing around her own fingers, and I was on the verge of shooting all over the hallway carpet, carried away by the filthiness of the situation, at the most exciting moment of my life up to then, my cell phone rang.

The first thing I did was search desperately in my pocket, shoving my cock back into my pants in a rough tug. The phone vibrated shrill and shattered the tension. When I finally managed to end the call — I never knew who it was — I looked up and met my sister’s gaze. She was breathing hard, her fingers still sunk between her legs, with an expression split between fear and arousal that seemed, against all logic, divine to me. She was good enough to eat with kisses, to throw myself on top of her and fuck her right there.

All I did was turn around and run to my room.

That night I didn’t sleep. I spent it with my cock in my hand, jerking off again and again with the image of my naked sister burned into my head, coming three times onto my stomach without managing to take the heat off me. And although I didn’t know it then, that was the first crack through which everything that would come later slipped in.