The Night My Sister Opened the Door Without Warning

I have a younger sister who is twenty-five now, but back then she had only just turned twenty-one. She was always the sensible one in the house, the one my parents held up as an example, the one who would never accept a party if she had class the next day. The kind of girl who studied on Saturday afternoons while I snuck out to go dancing with my friends.

At the time she was taking the prep course to get into the public university. The classes were at an institute three blocks from the apartment where I lived with Mateo, my partner of almost three years. My parents live in another city, so when they found out my sister would have to travel every day from home, the idea of her staying with me for a few weeks seemed like the obvious plan.

—Take care of her —my mother told me on the phone, as if I were still twelve.

—Don’t worry —I said, laughing—. She’ll be better off here than in a dorm.

Mateo always got along well with her. Too well, in my opinion, because whenever she came to visit, the two of them would end up sprawled on the couch playing Call of Duty until all hours, while I brought them pizza and watched them with a mixture of tenderness and envy. My sister laughed with that nervous laugh that would slip out of her whenever she lost a match, and Mateo teased her nonstop.

The first day she moved into our apartment was a Sunday afternoon. She arrived with a huge suitcase, two thick calculus textbooks, and a backpack full of chargers. We gave her the guest room, which was right next to ours, separated only by a thin wall and a door that didn’t quite close properly.

That first night we had dinner together, the three of us. We talked about university, about professors, about a guy she liked in class and didn’t dare speak to. Mateo, with a glass of wine in his hand, gave her advice with the seriousness of a marriage counselor.

—If you like him, tell him —he said—. The worst that can happen is that he says no, and then that’s it, problem solved.

—That’s easy for you to say when nobody’s ever told you no —she shot back, looking at me with a conspiratorial smile.

I laughed. I wasn’t going to tell her that, yes, more than one guy had brushed me off before I met Mateo.

***

On the third day, it all started. We had dinner early because my sister wanted to review thermodynamics before bed. Around eleven, she went into her room with the light on and her laptop open. Mateo and I stayed a little longer in the living room, watching a series neither of us was really paying attention to. I was looking at the back of his neck while he pretended to read his phone, and I knew exactly what he was thinking.

We had gone four days without touching each other. Four days felt like an eternity after three years of being used to getting intimate whenever we felt like it. And Mateo, who has just about the patience for that sort of thing, was already right on the edge.

—Let’s go to bed —he said at last, not taking his eyes off the screen.

—I’m sleepy —I lied.

—I’m not.

We brushed our teeth side by side in front of the bathroom mirror. He had that expression I knew too well: relaxed jaw, eyes slightly narrowed, a smile barely sketched at the corner of his mouth. He gave my thigh a slap when we stepped out into the hallway, and I brushed his hand away.

—Don’t even think about it —I whispered.

—About what? —he said, all innocence.

—What you’re thinking.

—I’m not thinking anything.

We got into bed with the light off. My sister’s room was three meters from ours and, beneath her door, the yellow glow of her desk lamp was still visible. I turned toward the wall, closed my eyes, and tried to fall asleep. Mateo settled in behind me, spooning me, his hand resting on my waist.

That hand didn’t stay still for even two minutes. It started sliding downward, slowly, tracing the curve of my hip, down over my ass, squeezing with that firmness he knows undoes me. I shoved his hand away again.

—Mateo. No.

—I’m just touching you.

—Stop.

—I’ll do it quietly —he whispered in my ear—. She won’t even notice.

I was going to tell him he was crazy. I was going to tell him no, not now, that my sister could really hear anything from the other side of that thin wall. But he already had his mouth on my neck and his teeth grazing exactly where he knew I’d lose the argument. He knew me too well.

—Five minutes —I asked, slipping out of bed—. I’m going to the bathroom and I’ll be right back.

I closed the bathroom door carefully, turned on only the mirror light, and crouched in the shower to give myself a quick cleanout. It wasn’t the best one I’d ever given myself, honestly. I was in a hurry, my hands were shaking, and all I could think about was my sister getting up to use the bathroom at any moment. I dried off, splashed some cold water on my face, and went back to the room.

Mateo was propped on one elbow, waiting for me. The sheet covered just enough to make him look even more provocative than if he’d been completely naked. I took off my boxer briefs in silence and climbed back under the covers.

***

He started with my back. He kissed the back of my neck, then my shoulders, then the space between my shoulder blades. I felt his warm breath sliding down my spine while one hand stroked my thigh from behind. We went back to spooning, and this time I didn’t push anything away. I took the lubricant from the drawer of his nightstand with my right hand and handed it to him without looking.

I heard him opening it. I felt the cold gel between Mateo’s fingers, first slipping over my slit, opening me with patience, then probing deeper with one slow finger that made me let out my breath through my teeth. Mateo is never in a hurry with that. He likes to take his time, to watch my body loosen up, to hear me breathe differently. I closed my eyes and buried my face in the pillow so no sound would escape.

—Like that, still —he murmured by my ear—. Let me see you open for me.

The second finger slid in more easily. He held me by the waist so I wouldn’t move too much, and with his other hand he spread my ass a little wider, testing, preparing me until the pressure stopped hurting and started to feel like a fucking obvious need. The bed stayed silent, but my pussy was already burning and the skin at the back of my neck was electrified by every kiss he left along my back.

When he entered me, he did it slowly. Centimeter by centimeter, waiting for me to get used to him, his left hand squeezing my waist to keep me against him. The head of his cock opened me, hard and hot, and I had to bite the pillow to keep from moaning out loud. I felt him going deeper and deeper, filling me until the pressure tore a shiver through me from my lower back to my stomach.

—Fuck —I whispered.

—That’s it —he said, his voice rough—. That’s how I like hearing you.

We stayed like that for a while. Spooning, without any sudden movements, without moans, just our synchronized breathing and the shared heat under the covers. Mateo moved slowly at first, pulling out just a little and then entering again with short, precise strokes, as if he were measuring every inch to keep from making noise. I could feel his breathing getting heavier against my skin and the way he pressed his hand against my stomach, as if he wanted to keep me pinned to him so not even one vibration could slip away.

I was starting to forget where we were. There was only the bed, his weight behind me, the slow rocking that was making me wet again, the exact friction on that spot that made my legs part without thinking. He was driving his cock into me with cruel patience, rubbing me inside, making me feel every thrust like a promise of something dirtier.

—You like it when I fuck you like this, nice and quiet? —he whispered, brushing my ear with his mouth.

I nodded with my face buried in the pillow, and he let out a low, brief, pleased laugh.

Mateo pushed my hips until I was on my knees. The bed trembled a little when I changed position, and the two of us froze for a second, listening. Nothing. Only the silence of the hallway. I rested my forehead on the pillow, lifted my hips, and spread my knees a little. He grabbed my waist with both hands, squeezed my ass, and entered me again, this time with a little more force.

By then it wasn’t a warm-up anymore. By then it was serious. I could feel the rhythm picking up, his fingers tensing on my skin, the way he leaned over my back to get deeper. The head of his cock was pounding inside me with a precision that left me breathless; each thrust drew out a tiny, muffled sound against the pillow, and he answered with a hand on my hip, holding me in place, setting the tempo.

—More —I begged in a thread of a voice.

—More what?

—Harder. Deeper.

He loved hearing me say it. I knew it from the way he gripped my hips more firmly and from how he started fucking me without the same gentleness, driving all the way in over and over, hitting exactly where I needed it. My ass bounced against his thighs, the bed creaked just a little with the change in pace, and I had to clench my teeth so my voice wouldn’t get too loud.

The pillow muffled my mouth and I dug my nails into his forearm every time he gave a harder thrust. I could feel the sweat between my breasts, the wetness building between my legs, the pulse beating in my cunt with every blow. Mateo slid one hand down, pressed my clit with his fingers, and that was when a stifled, desperate moan escaped me, one of those sounds that can’t be faked.

—That’s it —he murmured—. Just like that. I want to hear you shaking.

And then we heard them.

Footsteps. Short, slow, uncertain. In the hallway.

My blood ran cold. Mateo noticed instantly by how my whole body went rigid beneath him.

—Stop —I said, grabbing his wrist—. Mateo, stop.

—It’s nothing —he whispered, but he was listening too now.

—I said stop.

I sat up just enough to push him away, pulled him out with my hand, and stayed kneeling on the bed, listening. The footsteps had stopped. I thought maybe it had been the fridge, or the pipes. That house was old and made strange noises at night.

—Told you so —Mateo murmured, pressing himself against my back again—. It’s the house. Let’s keep going.

He put me back the way I’d been, only this time more alert, one hand on my waist and the other over my chest, holding me still while he filled me again, slowly. He entered me once more and I let out the air in a tiny gasp. The tension from the scare had left me more sensitive, more open, and each of his movements seemed to multiply inside me.

—Don’t make noise —he told me, mouth at my ear—. If you keep going like this, you’re going to make me come too soon.

I bit my lip and nodded, but we were already lost.

The thrusts grew wetter, heavier, with that dull sound of skin on skin that only exists when two bodies are no longer thinking about anything else. Mateo was pumping his cock in and out with restrained fury, controlling himself so he wouldn’t slam too hard and yet fucking me with an intensity that had me trembling. Every time he pulled out, the cold air made me moan; every time he pushed back in, the pressure sent another wave of heat through my stomach.

I clung to the sheets with my fists closed, ass lifted, chest pressed to the mattress, feeling myself getting closer and closer to the edge. Mateo opened my legs wider with his knees, leaned over me, and started fucking me with more precision, more sharply, more brutally, until he made my back arch and tore a broken sigh out of me.

—There, fuck —he said through clenched teeth—. What the hell kind of face do you make when I’m giving it to you properly.

That sentence was enough to finish dismantling me. I came clenching my thighs and burying my face in the pillow so I wouldn’t scream. The orgasm hit me all at once, thick, electric, flooding my stomach and making my legs jerk while Mateo kept thrusting in and out, demanding the last shred of sensitivity. I felt him tense behind me, felt his breathing turn hard, felt him squeezing my hips as if he wanted to sink even deeper.

—Don’t stop —I begged, still shaking.

—I wasn’t going to.

And then he fucked me with that fierce stubbornness that only appears when he’s just about to come. One, two, three more deep thrusts, and the hand at my waist slid down to grip my hip hard while the other reached for my clit again, driving me on until he left me completely limp. I felt his body go rigid behind me, heard him let out a low, contained moan, and felt his cock beginning to throb inside me.

He came with a long shudder, buried all the way in. I noticed it in the way he stayed still for an instant, in the way he squeezed my stomach, and in the thick heat that filled me as he emptied himself with a broken, brutal, almost furious sigh. He didn’t pull out right away. He stayed inside, breathing against my neck, recovering slowly, his fingers still pressed into my hips.

***

The door flew open.

No knock, no “can I come in?”, no whisper. My sister walked straight in with her hand on the knob and her eyes still adjusting to the light. I lifted my head at the same time Mateo froze on top of me.

Our eyes met.

Me, on all fours in the middle of the bed, still trembling after the orgasm. Mateo, kneeling behind me, holding my waist, looking completely stricken. And her, my sister, standing in the doorway in pajamas, an empty glass in her hand.

Time stopped for two endless seconds. They were so long I remember each one like a separate image. The yellow hallway light spilling in behind her. Her hair tied up in a messy bun. The way she blinked twice, as if trying to understand what she was seeing. And then, without saying a word, without a scream or an apology, she closed the door again. Slowly. As if she didn’t want to make any noise.

Mateo and I stayed exactly like that for a few seconds more. Me with my face against the pillow and him still gripping my waist, paralyzed.

—Tell me that did not just happen —I whispered.

—It just happened —he said.

I let myself fall onto my side and covered my face with my hands. I wanted to laugh and cry at the same time. I wanted to disappear. Mateo lay down beside me and stared at the ceiling, his hands crossed over his chest like he was at a wake.

—I’m going to talk to her —I said.

—Now?

—No. Not now.

Mateo switched off the little lamp. The room went completely dark and I turned toward the wall, listening to the apartment’s silence. I thought about getting up and knocking on my sister’s door. I thought about texting her. I thought of a thousand things to say to her the next day. I didn’t sleep all night.

Mateo, of course, did sleep. He was snoring within ten minutes. I looked at him out of the corner of my eye and understood perfectly why people sometimes throw a pillow at the person beside them.

***

The next day my sister got up early, as always. I heard her making coffee in the kitchen and hesitated for a long while before going out. When I walked in, she was sitting at the counter with a steaming mug and her calculus book open beside her. She looked up and smiled at me as if nothing had happened.

—Morning —she said.

—Morning —I replied, pouring myself a coffee I didn’t even want—. Hey…

—No.

—No what?

—We’re not talking about that —she said, closing the book—. It’s your privacy. I shouldn’t have opened the door without knocking. End of story.

I stood frozen in the middle of the kitchen with the coffee pot in my hand. I didn’t know what to say to her. She kept talking, not looking at me, stirring her coffee with a spoon.

—Look, you live with Mateo. You’re a couple. You do what couples do. I have nothing to say about it. And the last thing I want is to make this more important than it is, okay? I respect your business, I respect the way you live, and that’s that.

—It’s just that…

—It’s just nothing. It’s over.

She nodded, took a sip, and went back to the book. I sat down across from her in silence and watched her study for ten minutes. Then I reached across the table, tapped the back of her hand, and told her thank you in a very low voice. She just looked up, smiled, and kept reading.

Mateo got up two hours later, shuffled into the kitchen, and poured himself a coffee without saying hello. My sister looked up from her book, studied him for a second, and told him, with the most serious face in the world:

—Next time, lock the door.

Mateo choked. Coffee came out of his nose. I laughed for the first time in twelve hours.

Four years have passed since that night. My sister finished her degree, moved into her own apartment, and never, ever opened a door without knocking first again. Mateo and I are still together. And of all the stories the three of us have, that’s the only one we never tell out loud when we sit down to dinner.