What Happened on My Sister-in-Law’s Birthday Night

For weeks, there was nothing they talked about at my girlfriend’s house except that. Every time I walked through the door, Camila or her mother would say the same thing: “Antonella’s eighteenth is almost here.” They said it with a smile I never quite understood, as if that date hid something I couldn’t quite make out.

Antonella was, simply put, gorgeous. Brunette, tall, green eyes, lips always a little parted. She had her mother’s tits and Camila’s ass, and that was saying a lot. I thought she was shy because she hardly ever spoke to me. Then I realized it was something else. Camila had told her “little things” about me, and that, far from scaring her off, only made her nervous every time she looked at me.

The party was at my mother-in-law’s house. The uncles came, the cousins, the grandmother, my father-in-law Hernán—who had been invited despite the separation—my little brother-in-law Tomás, Camila, and me. I brought Antonella the perfume she herself had mentioned two months earlier. When she opened it, she hugged me for the first time since I’d known her. Hard, clinging to my neck, and whispered to me:

—They already told me that after this you’re going to give me another little gift.

She ran off to her room, red as a beet. I stood there in the middle of the living room with my face burning and the suspicion that the night wasn’t going to be like any other birthday.

The hours passed and the family started leaving. The grandmother first, then the uncles. Tomás was offered a place to sleep at his cousins’ place, and the kid packed his bag with the console and controllers in less than three minutes. When the door closed behind him, there were only five of us left: my separated in-laws, my girlfriend, her sister, and me.

We put on music, uncorked another bottle. We danced a little, all of us a bit drunk on wine. Daniela, my mother-in-law, looked at Hernán and asked him:

—Should I make that little tea from before?

—The one you know about? —he answered, raising an eyebrow.

—The one I always make.

—Is Antonella going to have some? —Camila asked.

—She’s eighteen now —Daniela said—. She can.

—I’ll help you, little mother-in-law —I said, not quite knowing why.

Camila jabbed me in the ribs and laughed, calling me a kiss-ass. I followed Daniela into the kitchen. I found her dropping some dried mushrooms into the teapot. She turned around, looked at me with shining eyes, and grabbed my crotch over my jeans.

—You have to open up the sensory side —she said, not letting go of me—. And we have to get you ready for the birthday girl.

—Your ex is in the living room, Daniela.

—Two sips of this and I won’t care about anything. It’s been a while since I tasted Hernán’s dick and I love how he fucks me. Yours has other destinations tonight.

I went back to the living room with the tray shaking. Camila was sharing a joint with her father on the sofa. Antonella came out of the bathroom at that moment, walked straight toward me, and put something warm in my hand. It was her thong.

—Go to the bathroom and smell it —she said in my ear—. That’s how hot I am.

***

I had no idea where to put myself. I was in my girlfriend’s house, she was smoking with her father, her mother was making mushroom tea, and her sister, who had just turned eighteen, was telling me to smell her thong in the bathroom. I hadn’t even gotten one kiss all night and my dick was already aching hard against my clothes.

Daniela showed up with the teapot and we sat down. I ended up between Camila and Antonella; the in-laws were facing us. The first sip was bitter. The second, not so much. By the third, the whole room started breathing to the same rhythm.

Camila was talking in my ear. Antonella too, on the other side. When I looked up, Daniela and Hernán were kissing like two teenagers who had just made up. I didn’t wait another second. I turned my face and kissed Camila deeply, so she wouldn’t get mad, while with my right arm I took Antonella by the waist and sat her on my lap.

—Have fun with both of us —Camila murmured against my neck—. It’s our gift.

I turned my head and kissed Antonella. She tasted of wine and something else, something sweet I couldn’t place. I slipped my hand under her dress and confirmed what I already knew: she wasn’t wearing anything underneath. The second I brushed her, her whole body jolted.

—Oh, little brother-in-law —she gasped—. Touch me, shove it in me. I want to be speared by that cock in a little while.

—Your sister, your mother, and starting today, you —I told her in her ear.

I lowered the dress straps and uncovered her tits. They were a younger, firmer version of Daniela’s: big, hard, the nipples pink like polished stones. I could have spent twenty minutes sucking them, but Camila took her by the arm and knelt her down beside her on the floor, in front of me.

My pants had flown off to some corner of the living room. I had both sisters kneeling, sucking me off. Antonella didn’t have Camila’s experience, but she learned fast. Camila would gag on purpose and show her how to open her throat. The scene was so unreal I couldn’t even think.

—That’s enough —Camila said after a while—. Antonella’s going to get what she wants.

***

Antonella sat up, took my cock in one hand, and guided it to her entrance. She lowered herself slowly. She swallowed it whole without blinking. I expected some resistance, but it went in as if she’d been waiting for that moment for months.

—You thought I was a virgin? —she said when she noticed my face—. I got started a few weeks ago with a classmate, right when you were partying with my sister and my mother. I didn’t want to get to today and have it hurt.

She started moving, first slowly, then bouncing with her whole body on top of mine. I sucked her tits as best I could and Camila, on the floor, licked my balls every time she rose up.

From the other side of the living room, a shout went up:

—Yeah, tear my ass apart like when we were boyfriend and girlfriend!

Daniela was on all fours on top of the coffee table and Hernán was giving it to her hard. Antonella laughed against my neck.

—We’re all going to get torn open —she whispered.

Camila pulled her off me, lifted her onto the sofa, and spread her legs at the height of my face. Antonella’s pussy was pink, perfect, with a well-defined clit. I dove in to eat her out like I’d been thinking about it for years, while Camila sat on top of me and started moving slowly. Having one sister in my mouth and the other on top of me made me understand that the night still had a lot left to give.

But I wanted control. I drove forward with my hips, lifted Camila off, grabbed Antonella by the waist, and fucked her standing up, holding all her weight. She screamed, hooked her legs around my hips, and I started moving hard, slamming her against me with every thrust.

—Bet your little boyfriend didn’t fuck you like this? —I asked her.

—Ufff, no, not even close. Keep fucking me, because I’ve wanted this for months. You have no idea how jealous I am of my sister.

Two tears slipped out of her. She kissed me on the mouth with a strange tenderness, out of place for what we were doing, and started moaning even louder.

***

On the coffee table, Camila had gotten into a sixty-nine with her mother, and Hernán was still pounding Daniela’s ass. I had Antonella all to myself. I laid her back on the sofa and fucked her missionary, sinking all the way in every time. She clung to the hairs on my chest and kept repeating:

—Oh, what a man there is in this house!

—I want to watch you fuck my mom —she said suddenly, between gasps.

—I want to fuck you.

—Yeah, but I want to see you do that front-and-back thing Camila told me about. Then you can break my ass in. I promise you.

I didn’t argue. I moved over to the coffee table, where Daniela and Camila were giving Hernán a two-handed blowjob, and came in from behind into my mother-in-law’s ass, all the way, without warning. Daniela squealed and let go of her ex’s dick with a laugh.

—Now in the pussy! Now in the ass! Now in the pussy! —Antonella shouted from the sofa, directing the scene like a conductor leading an orchestra.

The girl was a pervert. She kept telling me what to do and I obeyed, alternating between Daniela’s two holes, while Hernán masturbated watching everything. Then Antonella ordered:

—Now my sister!

***

Hernán finished off on a sofa, wiped out. Daniela sat beside him, whispered in his ear, and the two of them got up and headed to the bathroom. The three of us were left alone in the living room: Camila, Antonella, and me.

The sisters tangled together kissing in front of me. I moved closer and it turned into a three-tongued kiss. I was holding one ass cheek in each hand. I moistened a finger and started slipping it into Antonella. She jolted and pulled back.

—You told me you’d be the one to break me in tonight —I said.

—Of course. But I got a little scared.

—What a slut you are —Camila laughed—. I love it.

We put Antonella in the middle between the two of us. Each of us sucked one of her tits. I slipped a finger into her ass, Camila slipped two into her pussy. Antonella trembled, moaned, let out sounds she didn’t even know she had inside her. Camila asked me to get my cock nice and wet while she licked her sister’s ass to get it ready.

Antonella braced herself with her ass stuck out against the back of a single-seater sofa. Camila took my dick in one hand, lined it up with the hole, and let saliva drip down to lubricate it more. The head went in with difficulty. Antonella held on, breathing hard through clenched teeth, but she didn’t tell me to stop.

—Oh! Oh! Camila, bring Mom’s lubricant —she asked suddenly.

—She’s fucking Dad. If I go into the room, they’ll both fuck me.

—Bring oil. Butter. Something, because otherwise I can’t take it.

Camila came back from the kitchen with a tub of margarine. She stuck in two fingers, took out a generous amount, and smeared my cock all over with it.

—If you can’t handle this, you’re a pussy —she told her sister—. I got my ass broken in with just a little lube. Hang in there, baby.

I pushed in again. With the margarine I slid in like nothing. Antonella let out a long, sharp moan.

—Oh, oh, this is so much better! Why didn’t I fuck you before, little brother-in-law?

—Because you were underage —Camila answered for me—. And I didn’t want my boyfriend ending up in jail. But now I’m going to lend him to you from time to time.

***

Camila wanted more. She took both of us into the bedroom. She told Antonella to get on all fours on the bed and she climbed on top of her, also on all fours.

—This isn’t pussy and ass —she explained—. This is ass and ass. Five strokes in one, five in the other. Go hard.

I put on a little more margarine and started in. My cock flew from one ass to the other, from an ass to a pussy, from the pussy to an ass. I had two sisters, eighteen and nineteen, both gorgeous, both surrendered, both asking for more every time I went in. I felt like I was about to come and warned them.

The sisters turned over, pressed pussy to pussy, scissoring, and I spilled everything over both of them, where their lips met. My cum disappeared between the two sexes, sliding like lubricant. Camila looked at her sister with a crooked smile.

—You wipe him off, since you’re the birthday girl.

—Thanks, sissy.

Without separating their pussies, Antonella stretched her head out and cleaned my cock with that perfect little mouth until it was spotless. Then she sighed and said:

—Let’s take a shower, the three of us. I’m all sticky and my birthday’s still not over.

On the way out of the bedroom we ran into Daniela in the hallway. Hernán was leaving. My mother-in-law came with her hair still wet and her cheeks red.

—You’re going to shower? —she asked.

—Yes, mommy —Camila answered.

—Is there room for one more?

—On my birthday, anything goes, mommy —said Antonella, and took her by the hand.

I ended up sleeping in the little brother-in-law’s room, between the two sisters, with my cock burning and not knowing which of the two was my girlfriend and which one my lover. This family was going to drive me crazy. And I, I suspected, was already a little crazy too.