My Sister-in-Law Called Me from the Doctor’s Office with Another Emergency

Readers, I’m back to tell you another story.

In my first story, I told you about my wife’s family—my family now—and, above all, about Mariela, my brother-in-law’s wife, the woman who lives upstairs and who ended up changing the way I understand desire. To make today’s story clear, it’s worth repeating the basics: Mariela and I fuck in any gap life leaves us. A hurried blowjob in the utility room, with her kneeling on the cold tiles, swallowing my whole cock while we could hear my brother-in-law’s footsteps upstairs. A quick fuck against the kitchen counter when she came down on the pretext of getting sugar, her skirt hiked up to her waist and me fucking her from behind, one hand covering her mouth so she wouldn’t scream. Messages at three in the morning to meet in the building’s parking lot, her wearing nothing under her nightgown, riding me in the driver’s seat until she soaked it with her juices. Each of us with our reasons, each of us with the same thing to lose.

For almost a year now, she and my brother-in-law have argued every week. The walls are thin, and we hear everything downstairs. One of those fights left Mariela dizzy, almost fainting, as she later told me by text. The next day she went to the doctor alone. Her family has an old joke: Mariela is the dramatic one, the hypochondriac, the one who turns a headache into a migraine. This time, though, something really was wrong. And what she had was what set the afternoon I’m about to tell you in motion.

“Are you busy, Daddy?”

Mariela always spoke to me in a soft, almost childlike tone when she wanted to ask for something. I was in the living room watching a recorded game, and my mother-in-law, upstairs—yes, my mother-in-law lives upstairs with them too—had her sister from Querétaro visiting. I told Mariela I wasn’t busy, that I was free, and asked her to tell me.

“I need you to come get me at the doctor’s office. I’m dizzy; I can’t drive. The kids are at school, Sergio isn’t answering me, and I don’t want to ask your mother-in-law because she’s with my aunt.”

Sergio is my brother-in-law. That day he was in a meeting or whatever, and he never answered. I ordered an Uber and went to the private clinic near Polanco where Mariela sees her regular doctor. When I entered the waiting room, she was sitting there with her purse on her knees and a beige sweater pulled up to her neck.

“Thanks for coming, Daddy. Let’s go home.”

I took her purse, asked the nurse for the prescription, and we walked to her SUV. I helped her climb in by taking her elbow and hand, slowly, the way you help someone who really feels sick. Once she was settled in the passenger seat, before I could put the key in, she said:

“I can’t do the seat belt. Help me.”

I leaned over to take the strap and, when my face was inches from hers, she moved closer and bit my lower lip. Meanwhile, her hand had slipped over my pants until it settled exactly where there could be no doubt what she was looking for. She squeezed my cock through the fabric, felt it from top to bottom, and smiled when she felt it harden beneath her hand within seconds.

“This is the medicine I need,” she whispered as she lowered my zipper a little and slipped her hand inside, gripping my bare cock. “And you’re going to give it to me. All of it. Inside.”

***

I asked her if we should stop at the pharmacy. She shook her head, smiling, without letting go of my cock, slowly jerking me off right there in the doctor’s-office parking lot, her thumb circling the head.

“The prescription is real. But I’ll fill it later. Right now, the only thing that cures me is this,” she said, then brought my pre-cum-wet fingers to her mouth and sucked them one by one.

I started the SUV as best I could, with my cock out and her laughing. I drove the ten minutes between the office and the motel she had already chosen. It’s on a frontage road, hidden among repair shops, with individual garages and curtains that drop as soon as you drive in. Mariela had been there before, I knew because she asked the receptionist for a specific room, the one with the jacuzzi at the back. The whole way, she kept one hand on my fly, squeezing me, while with the other she opened her sweater and freed one breast to pinch her nipple. I nearly ran two red lights.

As soon as I closed the room door, she took off her sweater, blouse, and pants without speaking, without putting on a show, with the same efficiency she brings to everything. She stood naked in the middle of the room, looking at me. Her large, heavy breasts sagged slightly, their nipples already hard and dark; her pubic hair was shaved, and the lips of her pussy were swollen and shiny, as if she had been wet for hours. Because she had been wet for hours.

“I was talking to your wife a few days ago,” she said as she let down her hair. “She told me about the weekend in Tepoztlán, about the cabin. How you fucked everywhere. I got horribly jealous.”

“Jealous of her or of me?”

“Both of you. I wanted something like that, a place for us, without kids upstairs or mothers-in-law on the other side of the wall. And I thought of taking advantage of the doctor’s appointment.”

She made me laugh and feel tenderness at the same time. Mariela is in her thirties, with two children, a big house, an SUV, a life anyone would sign up for, and even so she’s discovering things little by little, as if she had only just begun. Almost everything new in her sexuality, she’s discovering with me, and that turns me on like very few things do. I’m her brother-in-law, the one who’s close by, the one who has exactly as much to lose as she does if we’re found out. It works. Period.

I stripped too, throwing my clothes wherever they landed. She came up to me and took my cock in both hands, weighing it, measuring it with her fingers as if she were seeing it for the first time. She knelt on the carpet without ceremony and took me all the way into her mouth, down to the back, until I felt her throat close around the tip. She started sucking me, her head moving back and forth, making that wet, filthy sound that had stayed burned into my memory since the first time, while one hand squeezed my balls and the other slipped two fingers into her pussy. I looked down at her and grabbed her hair in a fist, helping her keep my rhythm. She pulled me out abruptly, pressed my cock against her cheeks, licked me from my balls to the tip, spit on me, and swallowed me whole again. I was about to come right there, but I lifted her by the hair first.

“Not yet. You’re going to get your full dose of medicine.”

I picked her up by the ass, and she wrapped her legs around my waist. We kissed like that, suspended in midair, while I walked slowly toward the bed. My wife has a small bust, and before Mariela I had never stopped to think about whether I liked big tits or not. Now, when I want a good pair, I know exactly where to knock. I bit one of her nipples as I carried her, and she let out a moan that drove straight into my cock.

I laid her facedown. I started at the nape of her neck, using my hands. I massaged her shoulders and upper back, feeling her relax beneath me. I moved down her spine with my mouth, stopping at every mole. When I reached her ass, I gave it three slow, almost chaste kisses. Then, without warning, I spread her cheeks wide and ran my tongue along the middle, from her pussy to her asshole, in one long, filthy lick.

She tried to close her legs, caught between laughter and protest.

“Wait, wait, no, not there…”

“Stay still.”

I held her firmly by the hips. I started with short, slow kisses on her tight asshole until her body gave in. Then I used my tongue, circling it, pushing the tip against the ring until it opened slightly and I could penetrate her little by little. She ended up spreading her own cheeks with her hands to give me better access, arching her back, offering me both holes at once. I slipped two fingers into her pussy while I kept eating her ass, and felt everything contract around me. That’s what I love about Mariela: she starts by saying no to things she’s screaming for thirty seconds later.

“More, Daddy, more tongue, oh, you son of a bitch, don’t stop…”

***

In one movement, she turned beneath me and ended up on her back. She raised one leg, gently pushed my shoulder with her heel, and said:

“Someone else is waiting for you, Daddy. She gets jealous when you give her neighbor so much attention.”

That was all it took. I lowered myself between her legs and buried my face in her with my mouth open, without preliminaries. I spread the lips of her pussy with my fingers and drove my whole tongue inside, pulling it out and thrusting it back in as if I were fucking her with it. She tasted sweet, almost fruity. She mentioned it later, when she had caught her breath: she had been on a diet of pineapple and juices for some medical reason, and it showed.

I moved up to her clitoris and took it completely into my mouth, sucking hard, while I thrust three fingers into her pussy and used the thumb of my other hand to press against her asshole, still wet with my saliva. She arched her back sharply, gripped the sheets, and began moving her hips against my face, pushing, fucking my mouth. I ran my flat tongue over her entire pussy, wrapped it around her clitoris, and moved it quickly from side to side. I stayed there for several minutes. Five, six, I don’t know. Long enough for her to start trembling and squeeze my head between her thighs. At one point she started repeating that she was going to piss, that I should stop, that she was serious. I know her. I didn’t stop. I increased the rhythm and pressure of my tongue exactly where I know it breaks her, while I curled my fingers inside her against that spongy spot that makes her explode.

What came next was something between a sigh and a rush of air, followed by a warm stream that soaked my face, neck, and chest. A long, sustained gush that burst out of her in spurts every time I pressed my fingers inside her. She lay still for a few seconds, breathing with her mouth open, one hand on her forehead, her legs trembling. Then she laughed.

“I swear I thought I was pissing myself.”

“You didn’t piss yourself.”

“I know. Thanks for the maintenance.”

That was her favorite joke. She called me her “maintenance technician.” She said it every time she finished, with the same conspiratorial smile.

I knew she became sensitive after her first orgasm. She almost never agreed to let me fuck her pussy twice in a row unless it was from behind or I let her finish with my mouth. She got on all fours at the edge of the bed and offered me her raised ass, arching her back nicely, offering me what she had been avoiding the whole time.

“Fuck my pussy, Daddy. But slowly; I’m a mess.”

I ran the head of my cock along her slit from top to bottom, soaking it in the juice still running out of her. I rubbed it against her clitoris several times until I heard her moan and push me backward with her ass. I entered slowly, measuring her, sliding it in an inch at a time, pulling out, then going a little deeper. I know her well enough to know when to speed up and when to let her adjust. Once I had my whole cock inside her, I stayed still for a second, feeling the walls of her pussy pulse around me. Then I grabbed her hips and began pounding her for real, driving every thrust all the way in, making her ass smack against my pelvis with a sharp, wet sound that filled the room.

She braced herself with her hands spread against the headboard, biting the sheet now and then so she wouldn’t scream too loudly—the motel wall was thin, and we could hear a voice in the next room. I slapped one ass cheek, then the other, and on the third slap she asked for more. I grabbed her hair at the roots and wound it around my hand, pulling her backward as I fucked her. She began muttering filthy things: that she was a slut, that she was my slut, that I should fuck her harder, that I should split her pussy right there, that Sergio hadn’t fucked her like that in years. Every sentence tightened my balls more.

I ran my wet thumb over her asshole and pushed it inside while I kept fucking her from the front. I felt it opening little by little, taking my finger up to the knuckle. She started coming again, more quietly, deeper inside herself, her ass tightening around my thumb and her pussy squeezing my cock in waves. We stayed like that for another five minutes until I felt myself coming.

“I’ve decided,” I told her, stopping for a second with my cock buried to the base. “Inside or in your mouth?”

“What do you prefer?”

“Inside. So tonight, when Sergio kisses you, you’ll feel me too. So you’ll go to sleep with my cum inside you.”

She laughed breathlessly.

“You’re such a son of a bitch. Do it. Empty yourself into me, Daddy.”

I did. I gave her four or five more hard thrusts, all the way in, and came inside her while holding her by the waist, pressing her against me, feeling each spurt of semen shoot against the back of her pussy. I didn’t move until I was finished, until I felt the last contraction empty itself inside her. Then I pulled out slowly and watched a thick white thread begin to run down her thighs. I ran two fingers along her slit, gathered some of the mixture of semen and juices, and brought them to her mouth. She sucked them, eyes closed, as if it were the best dessert. She dropped onto her side on the bed, eyes closed and wearing a silly smile, my cum still leaking from her pussy.

***

We spent another twenty minutes in silence, with bits of conversation in between. She told me the argument the other night had been about money, again. I told her my wife was thinking about changing jobs. Normal things, said on a motel bed, naked, with my semen still drying between her legs, as if we were any ordinary couple on any ordinary afternoon.

Then she went to shower, and I stayed there staring at the ceiling. I thought about my brother-in-law, about his habit of kissing his wife on the mouth when he came home from work, about how he bragged at every family dinner that they had “the perfect family.” Pride always gets the better of him. If he knew that I know the taste of his wife better than he does. If he also knew that his own sister—my wife—had once kissed the same mouth as his wife.

But that’s another story. I’ll tell you about it another day.

Mariela came out of the bathroom wearing a short motel robe and began tying up her hair in front of the mirror. I dressed without hurrying. Before we left, she glanced at me over her shoulder.

“Remember Thursday. I need to check my phone before the surgery. Delete things. Better somewhere quiet.”

“Another motel?”

“Yes. And this time I want you to break the thing my husband never uses. I want you to fuck my ass all the way to the back, Daddy. Leave it burning for three days.”

She ended the sentence with the smile she always wears when she says something she knows will keep me thinking all day. And did it ever work.

That’s why I decided to publish this story now. I’ve had a hard-on for half an hour, and there are still three days until Thursday. If I write it down, I thought, maybe it’ll go away.

It didn’t.

I’ll tell you about Thursday soon. And about my ex-wife, who has a story of her own. Women, believe me, are perverse. It just takes some of them longer to show it.