Two Nights Alone with My Sister’s Husband

Mateo was finishing a work trip in Houston and was arriving in Cancún on Thursday afternoon to meet me. I had landed that same morning, getting there ahead of the others. My sister Lucía wasn’t arriving until early Saturday, and from there the three of us were heading to Playa del Carmen to start the real vacation. Until then, I had almost two days with my brother-in-law, alone.

I’ve known Mateo for ten years, since he started dating Lucía. We’ve traveled together several times, as a family, and we always got along well. He’s the kind of man who listens, who laughs without making a scene, and who knows how to pick wine. I had never thought of him as anything other than my sister’s husband.

At the hotel we asked for a room with two separate beds. When I got to reception, they told me the only room available had a double bed. I shrugged; I was already there, so I agreed. I spent the day at the pool and in the jacuzzi, reading a book I didn’t finish and drinking margaritas I shouldn’t have. At six, he arrived.

—A double bed? —he asked when he walked in, with that half smile of his.

—They didn’t have anything else. Does it bother you?

—Not at all. If you misbehave, I’ll send you to the couch.

We laughed. We decided to get ready to go out for dinner. It was my first time in Mexico, and he knew the area like it was his own neighborhood. He told me he was going to take me to the best seafood place downtown.

Since it was thirty-four degrees outside, I put on a short miniskirt, the kind I always wear, and a white lycra T-shirt without a bra. Heeled sandals. When I came out of the bathroom, I found him adjusting his collar in front of the mirror. Our eyes met for a second too long.

—You look pretty —he said, and looked at himself in the mirror again.

We had dinner at a restaurant overlooking the sea, drank coffee at a place with live music, and walked along the boardwalk until the cool air got to our backs. All very normal. We went back to the hotel, I changed in the bathroom, he changed in the room, and we got into the same bed keeping a prudent distance. That night I fell asleep thinking you could feel the heat of his body even with half a meter between us. I slipped a hand between my legs under the sheet, my cunt already soaked, and made myself come biting my lip so I wouldn’t make a sound, imagining that the hand was his.

***

The next day we had breakfast at the hotel and drove to a beach he knew, wide and white, with palm trees and young people. We rented loungers, ordered beers, and stretched out in the sun.

I had come determined to go topless. I had talked about it with Lucía and she had told me she’d do it with me. Looking around, all the women were doing it without a fuss. After a while, Mateo said it to me in a low voice.

—Weren’t you going to make the most of the trip?

—I wanted to wait for Lucía. Alone, I don’t know, it feels weird.

—Nobody here knows you. And everybody’s doing it.

I thought about it for a minute, looked around, and untied the top of my bikini. The first few seconds I felt like everyone was watching me. Then, nobody. I even went into the sea with him as if it were the most natural thing in the world, without thinking. At one point, while I was putting sunscreen on my shoulders, I caught him staring at me. Not pretending not to. Really staring, eyes fixed on my wet tits. I felt heat in my face, and something else lower down. My nipples got hard as rocks and he looked away immediately, but I caught the bulge straining against his swimsuit.

We had lunch at a shopping center near the hotel zone. Then we walked through the stores and went into a lingerie shop. Mateo loves that brand; he buys things for Lucía every time he travels. I got hooked on a black lace set, an underwire bra and a thong, and took it to the fitting room.

—Come on, show me —he said from outside, in the hallway.

I opened the fitting room door with the bra on. He looked me up and down, unhurried.

—It looks incredible on you. Try on the panties, so we can see the whole set.

I closed the door. I changed with a slight tremble. When I opened it again, I was practically naked in front of him, in an empty hallway, under a yellow light that forgave nothing. The thong left my whole ass out and in front it was a lace triangle that barely covered my cunt. I saw his Adam’s apple move when he swallowed, and the way his pants swelled.

—It’s perfect —he said, his voice a little rough—. Buy it.

I bought it without looking at the price.

***

After the mall we decided to go back to the beach. The day was still glorious. Instead of driving to the midday area, we stopped at another parking lot farther south, bordered by a row of tall plants that blocked the view to the other side. We climbed the wooden stairs and reached the end of the path.

It was a nudist beach. We hadn’t read any signs. Mateo and I looked at each other, not knowing what to do. People were walking around with not a thread on, men and women of all ages, without a trace of shame. We thought about finding another beach, but we had already paid for parking and didn’t feel like going back to the car. Mateo, who was wearing a tiny, tight competition-style swimsuit, shrugged. I had my tiny thong on.

—We’re already here —he said.

We walked about a hundred meters until we found a more empty spot. We laid out the towels and sat down. I started looking at people with a mix of curiosity and secondhand embarrassment. Beautiful bodies, ordinary bodies, wrinkled bodies. Men with cocks very different from one another, some hanging heavy, others small and shriveled by the cold water. Women with shaved cunts, others with thick hair, tits of every size. Mateo noticed where my eyes kept going and laughed.

—Does it amuse you?

—More than I expected.

We talked about bodies as if we were commenting on a movie. No taboos. After a while I took off the top like I had in the morning. People looked at us strangely, the only ones dressed. Mateo said, almost joking:

—What if we take everything off?

—Not a chance.

—Think about it. Nobody knows us. We never come back to this beach. It’s our secret.

I thought about it. I thought about it more than I should have. And I told him yes.

I pulled my panties down slowly, turning away at first, and lay face down on the towel. He took off his swimsuit and lay down beside me. When I turned my head, I saw he was incredibly well endowed: a thick, long cock, the pink head peeking out between his thighs. It looked heavy even when it was flaccid. My sister is lucky, I thought, and hated myself a little for thinking it. My mouth watered imagining what it would feel like to have it inside me.

We put sunscreen on the places that had never seen the sun. We talked about anything and everything to forget where we were. After a while we changed positions, lying on our backs, and I could no longer avoid glancing at him. His cock moved only slightly with the rhythm of his breathing. He did the same with me, his eyes moving back and forth between my nipples and my shaved cunt. When we went into the sea, the waves pushed us against each other, and every time his body brushed mine I felt a shiver that had nothing to do with the cold water. At one point his cock, half hard already, brushed my hip under the water and we both pretended not to notice.

***

We got back to the hotel at six. We showered —in shifts, of course— and went out to dinner at a restaurant downtown. A bottle of wine, then a second, then two tequilas we shouldn’t have ordered. We laughed about the nudist beach like two accomplices. “Nobody must ever find out,” he said, and I clinked my glass against his.

From there we went to a bar with electronic music. We danced first apart, then holding hands, then bodies pressed together. At one point I turned around and gave him my back, moving my hips against him. I felt his erection against my ass, rock hard, outlined all the way through the fabric of my dress. I didn’t move away. He slid his hands down to my hips and pulled me against him, grinding that cock against my ass, and I let him, crushing my cheeks against him to the rhythm of the music. One of his hands rose and brushed my chest over the dress, feeling my nipple stiffen. We had spent twelve hours putting this off.

I went to the bathroom as an excuse to touch up my makeup. When I pulled down my thong, I discovered I was completely soaked, strings of wetness sliding between the lips of my cunt. I slid two fingers in and pulled them out shining. I stared at myself in the mirror for a while, deciding what to do. When I went back to the dance floor, I told him we should go back to the hotel.

***

In the room, he went into the bathroom first. I sat on the edge of the bed, took off my sandals, and waited my turn. When he came out, he had put on briefs and was rubbing after-sun cream over his chest and arms. His skin was red from the hours in the sun.

—Good idea —I told him—. My whole back is burning.

—Do you want me to put some on you?

I looked at him. He looked at me. We both knew exactly what we were saying.

—Yes.

He turned off the ceiling light and left only the lamp in the corner on. He put soft music on the stereo, something slow, without lyrics. I sat on the edge of the bed and slipped the straps of my T-shirt down. He sat behind me and started spreading the cream over my shoulders, slowly, with both hands.

The sensation was cool, delicious. I closed my eyes. Mateo’s hands slid down my back and, when they reached my waist, he lifted my shirt to keep going. I took it off the rest of the way. I was left with my torso bare, the short skirt, the thong.

His hands circled my waist from behind and moved forward. When they covered my breasts, I let out the breath I had been holding for two days. His fingers rolled around my nipples, pinched them carefully, stretched them until they made me moan softly. I felt his broken breathing at my neck, and his hard cock pressing into my back through the briefs.

—You’re all wet, aren’t you? —he whispered in my ear.

—Soaked —I answered without thinking.

Then came the kisses. On the nape of my neck, on my shoulder, on my cheek. I turned my head and kissed him. His tongue against mine, deep, dirty, his hands searching for a way under my skirt. It wasn’t hard; it was too short. When his fingers reached the edge of my thong, I spread my legs without thinking. He slipped them under the elastic and found my cunt leaking. A rough groan escaped him when he felt how wet I was.

—We can’t —I murmured, while he opened my lips with two fingers and started stroking my clit in slow circles.

—I know —he said, and sank two fingers inside me to the knuckles.

We didn’t stop.

We fell onto the bed. We stripped off what was left with clumsy hands: the skirt flew off, the thong tangled around my ankles, his briefs went flying. I ran my mouth over his entire body until I found what I had already seen on the beach. Now it was rock hard, thick, with visible veins and the head shiny with pre-cum. It was everything I had imagined and a little more. I took it in both hands and brought it close to my face. I ran my tongue along the whole vein underneath, from the balls to the glans, slowly, looking him in the eye. He let out a long moan.

—Holy fucking shit, Cami...

I took it into my mouth, slowly at first, just the glans, playing with my tongue around the crown. Then I started taking it deeper and deeper, until it hit the back of my throat and I gagged. I came up, spat on it, and pushed it back down all the way. I sucked that cock with hunger, licking, bobbing my head up and down, making wet sucking sounds. With one hand I stroked his balls, with the other I pumped the base. He held my hair, not forcing me, letting me do it my way.

—Come here —he told me—. I want to taste you.

He turned me over on the bed and settled me on top of his face. I kept his cock in my mouth. When I felt his tongue against my cunt I almost fell. He started licking me from bottom to top, long, wide strokes, soaking me completely. Then he focused on my clit, sucking it, tugging it with his lips, while he slid two fingers inside me and curled them, searching for that spot. We went at it in a sixty-nine that lasted too long and not long enough, both of us moaning with our mouths full. When I felt I was about to come, I had to pull his cock out of my mouth just to breathe and scream. I came all over his face, soaking him, trembling with my legs tight against his ears.

—Come here, I want to feel it inside —I begged as soon as I could speak.

I climbed on top. Slowly. I took his cock in my hand and guided it to the entrance of my cunt. I rubbed it against my lips, against my clit, wetting it well. Then I started to lower myself. Feeling it go in, feeling him open me little by little, fill me centimeter by centimeter, was like a blow to the stomach. For a second I thought I wouldn’t be able to take it, that he was too thick, but the body adjusts. I went all the way down, until it pressed against my womb, and stayed still for a moment feeling it pulse inside me.

—You’re huge —I told him through clenched teeth.

—And you’re so tight. Move, come on.

I started moving, carefully at first, going up and down slowly, feeling his whole cock go in and out. I grabbed his shoulders for leverage. He held my waist, lifting and lowering me to his rhythm. Then I let go, braced my hands on his chest, and started riding him without restraint, bouncing, my tits slapping against his face. He lifted his head and caught one nipple in his mouth, sucking hard while I rode him.

—Turn around —he asked, without taking it out.

I turned around without getting off, until I was facing away from him, in reverse cowgirl. Now he could see my whole ass while I moved. I braced myself on his knees and started bouncing, letting him watch his cock going in and out all smeared with my cunt. He slapped my ass hard enough to make me cry out and clench all around him.

—Get on all fours —he ordered, his voice changed.

I lowered myself and got down on my knees on the bed, face against the pillow and ass up for him. He settled in behind me. I felt the head of his cock brushing my cunt lips, looking for the entrance. And then the shove all the way in, in one shot, balls deep. I screamed into the pillow.

He started fucking me like that, gripping my hips, thrusting hard, all the way, without mercy. The bed creaked. I could hear the slap of his pelvis against my ass, the wet sounds of penetration, my moans muffled in the pillow. He grabbed my hair and pulled me back, arching me so he could drive into me from another angle. He shoved a finger into my ass while he kept fucking my cunt, and I came again, squeezing around him, moaning his name.

—I’m going to come —he panted.

—In my mouth —I told him—. Come in my mouth.

He pulled out, stood beside the bed, and I knelt in front of him. I took hold of his cock, slippery with my juices, and put it in my throat a couple more times. Then I pulled it out and pumped him fast with my hand, tongue out, looking him in the eye. When he came, he filled my mouth with thick, hot spurts, one after another, so many that they spilled from the corners of my lips. I swallowed as much as I could, then licked the tip until the last drop was gone and smiled at him with his semen still on my lips.

We both lay there on the bed, breathless, wordless, skin sticky and the sheets a mess. He curled me against his chest. He ran a hand through my hair.

We held each other. We didn’t talk. We fell asleep like that.

***

On Saturday at nine in the morning I went to pick Lucía up at the airport. Mateo stayed at the hotel. I hugged her as if nothing had happened, because that was what I had to do. For years it was a secret that only he and I carried.

Much later, I don’t know why, one night over wine I told my sister. I thought something between us was going to break forever. She looked at me for a long while, poured herself another glass, and told me she already knew. That she had suspected it back then, on that vacation. And that it didn’t matter to her as much as I thought.

Sometimes the worst secret turns out not to be one at all.