What Happened with My Girlfriend’s Sister That Early Morning

I’m not entirely sure where to begin telling this, because to this day no one knows. I’m writing it more to get it off my chest than to brag, though I admit that every time I remember it, I get hard without asking permission. I’d spent two weeks with my head somewhere else, distracted at work, snappish with Daniela for no apparent reason. The truth is there was a reason, and her name was Mariana, my girlfriend’s younger sister.

Something had happened between us a little while before, something we both decided not to name. A bit of groping in the hallway that ended with my fingers knuckles-deep in her wet pussy and her mouth biting my neck so she wouldn’t scream. Nothing more than that, but it was enough to wreck my head. Since then, every time I saw Daniela I felt guilty and had a hard cock at the same time, an uncomfortable mix that wouldn’t leave me alone. I kept trying to convince myself it had been a mistake, a slip that wouldn’t happen again. That conviction didn’t last long.

That Friday afternoon, Daniela called me as I was leaving the office. Her parents were going to a wedding in another city and wouldn’t be back until Sunday. She invited me to stay over at her house, to spend the weekend alone together. I said yes before she finished the sentence, and as I hung up I knew perfectly well that part of my excitement had nothing to do with her.

I got there around eight with a bottle of wine and some pizzas. Daniela opened the door with a long kiss, in short pajamas, happy to have me all to herself for a couple of days. We went in laughing, and then I saw her. Mariana was on the living room sofa, wearing tight black leggings that outlined her pussy like they’d been painted on and a short blouse that left her belly bare, watching a series with the remote control on her thigh.

—Hi, brother-in-law —she said, flashing me a sideways smile that made it clear she hadn’t forgotten a thing either.

This is going to be a very long weekend.

The three of us had dinner in the kitchen, with the TV on in the background and the wine flowing. Daniela had three glasses and got affectionate, her hand on my knee under the table. Mariana drank juice, said she didn’t like alcohol, and every so often held my gaze a second too long. I tried to follow my girlfriend’s conversation and kept failing.

—I’m dead —Daniela said at last, stretching —. This week was hell. Let’s go to bed.

—I’m going to keep watching the series for a while —Mariana answered without looking up —. I won’t bother you.

We went up to Daniela’s room. The moment she closed the door, she hung from my neck and we started kissing against the wall. I pulled off her blouse, sucked her nipples until they hardened, bit her neck. I pulled down her panties and slid two fingers into her all at once, finding her already wet. She gasped against my shoulder and squeezed my cock through my pants.

—Fuck me —she whispered in my ear —. I missed you all week.

She lowered my pants and knelt, with that eagerness I’d always liked about her. She took my cock into her mouth all the way, pulled back, licked it slowly from base to tip, grabbed my balls with one hand while she sucked. I closed my eyes and tried to be there, with her, and for a moment I managed it. But when I looked at her face and saw her lips stretched around my cock, the one who flashed in my head was Mariana.

I lifted Daniela and threw her onto the bed. I spread her legs and ran my tongue over her pussy, sucking her clit with my whole mouth until she started trembling against my face. Then I climbed on top and drove it all the way in with one thrust. Daniela moaned with her head thrown back, dug her heels into my ass, begged me harder. I fucked her deep for a good while, changing positions, with her on top, then on all fours, and she ended up exhausted, with my cum dripping down her thigh, and fell asleep almost immediately, pressed against my chest, breathing slowly. I stayed staring at the ceiling, awake, listening to the silence of the house.

***

Close to two in the morning, I got up under the excuse of going to the bathroom and coming down for a glass of water. It was half true: I was thirsty, but I also hoped the rest of the house wasn’t as asleep as it seemed. I went downstairs barefoot, quietly, avoiding the stair that always creaked.

There was light in the kitchen.

Mariana was there, standing by the counter in a tiny pajama set, pouring herself a glass of water as if she’d been waiting for me. The tank top barely covered her and her hard nipples were visible through it, and she had a white panty wedged between her ass cheeks from behind. She turned when she heard me and didn’t look surprised at all.

—Couldn’t sleep, brother-in-law? —she asked, setting the glass on the counter without taking a sip.

—No —I admitted, taking a step toward her—. And I think you know exactly why.

She laughed softly, a laugh that was more invitation than mockery. Instead of stepping back, she turned around and leaned against the edge of the counter, arching her back just a little and sticking her ass out. The gesture was so deliberate there was no doubt about it. She planned this from the moment we went upstairs.

I came up behind her. I pressed my body to hers and shoved my already hard cock against her ass with no attempt to hide it. I felt the heat of her skin through the thin fabric. She smelled like cream and something sweet, and that scent finished undoing me. I moved her hair off her neck with my nose and spoke into her ear in a very low voice.

—If we keep this up, there’s no turning back.

—The other time you left me wanting —she answered, turning her head slightly—. You made me come with your fingers and then you left. I’ve been horny for two weeks because of you. I didn’t come into the kitchen for water.

I ran my hands over her hips, her waist, and slid them up to her tits under the shirt. I squeezed them, pinched her nipples between my forefinger and thumb, and she let out a sigh that caught halfway in her throat. I lowered one hand and slipped it inside her panties. I found her soaked, so wet my fingers slid on their own between her lips.

—Look at how wet you are —I whispered in her ear as I rubbed her clit in circles—. You were already like this before I came down.

—For hours —she admitted, clamping her mouth shut so she wouldn’t moan—. Since you went up to the room with her. I heard her, I heard everything. I thought about you fucking her and I touched myself down here, sitting on the sofa.

I kissed her shoulder, the nape of her neck, while she threw her head back and pressed herself against my cock. The fear that Daniela might come downstairs made everything more intense, every sound in the house turned into an alarm, and even so neither of us wanted to stop.

I made her turn around and sat her on the edge of the counter. I ripped her shirt over her head and left her tits bare, small and firm, with the nipples standing up, pointing at my face. I took one in my mouth and sucked it fully, biting the tip, while with my other hand I kept working her pussy through the fabric. She grabbed my head with both hands and pressed me to her chest.

I yanked her panties off in one pull and left her naked on the cold wood. I knelt between her legs, threw them over my shoulders, and buried my face in her pussy. She was so wet my mouth filled at the first lick. I sucked her lips one by one, slipped my tongue inside, then took her clit gently between my teeth and worked it with the tip of my tongue until she started squirming.

—Cover my mouth —she gasped, grabbing my hair—. Cover my mouth before I come.

I lifted one hand and pressed my palm over her lips. She bit it, licked my fingers, took them into her mouth and sucked them like they were my cock. I kept going down there, devouring her pussy with two weeks of pent-up hunger, until I felt her whole body tighten. She came a few seconds later, her thighs clamping around my head, shaking all over the counter, muffling the cry against her own hand.

—I’m not done with you yet —I told her, standing up and wiping my mouth with the back of my hand.

I lifted her down from the counter, turned her around and bent her over the marble, her chest against it and her legs steady on the floor. I spread her ass cheeks with both hands and looked at her open, glistening pussy, and I had to bite my lip not to curse out loud. I ran the tip of my cock up and down over her lips without putting it in, and she started pushing back looking for me.

—Put it in —she begged in a thin voice—. Please, don’t make me wait any longer.

I shoved it in all at once, all the way to the hilt. Mariana muffled a long moan against her own arm and arched her back. She was so tight and so wet I almost came right there. I stayed still for a second, breathing, feeling her pussy throbbing around my cock.

—Slowly —she asked, turning her face against the marble—. Like that, slowly, because if you rush I’ll scream.

I did as she asked. I started moving slowly, pulling almost all the way out and sliding back in to the balls, controlling every thrust, paying attention to her breathing so I wouldn’t go too far. With one hand I held her hip and with the other I covered her mouth when the moans threatened to slip out too loud. She licked my palm, bit my fingers, pushed her ass back looking for more. The tension of fucking her in silence, of playing with the limit of waking her sister up just a few feet away, made everything electric.

—You’re tighter than your sister —I whispered in her ear, leaning over her back—. Tighter. Dirtier.

—Say it again —she panted, turning her face—. Tell me I’m better.

—You’re better —I told her, driving into her harder—. You fuck better. You get wetter. You’ve had me crazy since that hallway.

I picked up the pace little by little, always measuring. I ran my free hand over her belly, slid down to find her clit again, and started rubbing it while I kept pounding her from behind. I felt her body tensing, trembling against the counter, her thighs clamping around my hand. She came like that, biting her forearm so she wouldn’t scream, shaking all over, and her pussy clenched around my cock so hard it nearly dragged me with her.

—Not yet —I told myself more than her, and eased off for a second to get control back, squeezing the base of my cock with my fingers.

I pulled out, turned her around, and sat her back on the counter facing me. I wanted to see her face. I slipped my arms under her knees and drew her to the edge, opening her up completely. She gripped the edge of the marble with both hands, got herself settled, and guided my cock toward her with her eyes locked on mine. I pushed back in with one thrust and she let her head fall back, her mouth open in a silent gasp. I grabbed the hair at the nape of her neck, yanked her head forward, and made her look at me while I fucked her.

—Look at me —I ordered—. Look at my face while I fuck you.

She looked at me, eyes half-closed and mouth slack, biting her lower lip. I drove into her harder and harder, already forgetting the noise, the upstairs floor, everything. Her tits bounced with every thrust and her ass hit the marble. She clung to my shoulders, hid her face in my neck and dug her nails into my back. Like that, looking at each other now and then, it was different, more intimate and more forbidden at the same time.

—This can’t happen again —I told her, with absolutely no conviction, while I kept moving.

—Liar —she answered, with a smile caught between pleasure and exhaustion—. You know it’s going to happen again. You’re going to keep shoving your cock into me every chance you get.

And she was right. That certainty, far from stopping me, pushed me to the end. I felt like I couldn’t hold out anymore, that two weeks of imagining exactly this were all catching up with me at once. I fucked her deep, with short, hard thrusts, feeling my balls tighten.

—I’m about to come —I warned her in a whisper against her ear—. Inside or out?

—Inside —she gasped, squeezing me harder with her legs—. Come inside me, I don’t give a fuck.

I rammed my cock all the way in and let everything go, shot after shot, with my face buried in her neck and my teeth biting her shoulder so I wouldn’t scream. I felt my cum surging out and filling her pussy, while Mariana trembled pressed against me and whispered curses in my ear. I finished like that, hugging her over the kitchen counter, my heart pounding as if it were about to burst out of my chest and my cock still inside, throbbing, dripping the last of it into her.

***

We stayed still for a while, catching our breath, still tangled together. The house remained silent. I kissed her shoulder and she stroked the back of my neck, in a strangely tender gesture for what we had just done. When I finally pulled out of her, a white thread ran down her thigh and she wiped it away with two fingers, brought them to her mouth, and watched me while she sucked them clean.

—You have to go back upstairs before she wakes up —she murmured.

—I know.

Neither of us moved right away. We cleaned up in silence, put the glasses back, wiped the counter, erased any trace like two accomplices who already know how these things are done. Before letting go of me, Mariana grabbed my wrist and guided my hand back between her legs so I could feel how she was still dripping.

—Tomorrow, when she goes out shopping, you come up to my room —she said, and it wasn’t a question—. And you put it back in me. All morning if you have to.

I nodded. I went back up the stairs, avoiding the creaky step again, and lay down next to Daniela, who was still sleeping deeply, oblivious to everything, one hand stretched toward the empty side of the bed. I stayed there looking at her in the dim light, my cock still sticky inside the pajama pants and my guilt no longer as honest as it should have been, because inside all I was doing was counting the hours until morning.

I know what I’m telling doesn’t make me look good. I know that sooner or later this is going to blow up, that a lie like this can’t hold forever, that I’m going to end up losing both of them. I know it and even so I did nothing to avoid it. Sometimes desire is stronger than common sense, and I, that morning in the kitchen, with Mariana’s hand guiding my cock toward her pussy, chose desire without thinking twice. The only thing I know for sure is that, if I could go back, I’d probably do it again.