Chapter 1 — Instinct

This is a work of fiction. Names, characters, places and incidents are the product of the author's imagination. All characters are adults aged 18 or over.

---

She is my lover. The woman I will take responsibility for—someone I love so deeply that no expression could ever be enough.

I don’t know why she inflicts this pain and pleasure upon me, but perhaps it’s because she loves me just as intensely.

He and I have been best friends since childhood. We shared every sorrow and joy, and I would dare to call our bond absolute.

But after this incident, that bond cracked—betrayal carving wounds into the trust we once held.

To prepare for our marriage, I bought an apartment in the city. For the housewarming, I invited everyone I knew, eager to offer them a taste of my private pleasures.

The celebration lasted three days. The final guests were him and his girlfriend.

In the silent living room, the four of us sat mindlessly staring at the TV, eating fruit she had prepared.

“This apple is delicious. I heard fruit prices are sky-high these days, but this tastes amazing.”

His girlfriend was taller than me—so tall I wondered where he had found such a volleyball player. Her body was fully developed, flawless in every way.

“Narrators should eat more fruit, so have another.”

At his words, I realized her job—she was a narrator model—and suddenly her sturdy build made sense.

“David, have one more.”

My girlfriend handed me an apple. But I didn’t want it. My stomach hurt.

“I’ll go to the bathroom real quick. Eat without me.”

I stood up, secretly hoping he would touch my woman. Maybe I’m a pervert after all.

I’ve always been curious about swapping or partner exchange, but actually doing it? I’ve never had the courage.

I entered the bathroom, pretending to close the door completely—but left it slightly ajar. They had no idea I was watching them.

My girlfriend wore a short skirt, so his eyes must have clearly seen her bare thighs, unobscured by stockings.

I wish he’d say he’s turned on. I wish he’d admit how aroused he is by my woman’s thighs.

Maybe I really am a pervert. I desperately wanted my woman to follow his lead.

“David, where’s your phone?”

His girlfriend asked him. She said she heard a ringing somewhere.

Luckily, his phone was in his bag inside the spare room. She stood up, swaying her hips as she headed toward the small room.

At that moment—out of his sight, unaware I was in the bathroom—it was the perfect chance.

Go on, kiss her. Slide one hand under her skirt.

I watched them in silence, secretly wishing he would defile my woman. Only then would I get excited.

But disappointingly, I saw no movement between them.

I sighed deeply, flushed the toilet, and stepped out, clearing my throat twice as if I’d just finished.

“Did something you ate earlier upset your stomach?”

My woman asked me. My woman.

“Don’t know.”

Gruff, but it was the best I could manage.

“It’s been a while since we went to karaoke. We could go and have some fun.”

“Why bother…”

Suddenly, a perfect idea struck me. Karaoke was the perfect place for him to take my woman—and I wanted to go too.

“I don’t wanna go. I’d rather rest and head home.”

His words shattered me.

Fucking bastard.

The more I thought about it, the more I realized—maybe seducing his woman would be faster. Probably faster.

His girlfriend returned from the spare room after answering his phone and quietly sat beside me.

Looking at her, I couldn’t help but admire her beautiful ass. I wanted to touch it. So badly.

One of my hands began to inch toward the space between her thighs. I hadn’t touched her yet—no contact—but the urge was overwhelming.

I wanted to. Desperately. But I had to hold back. I couldn’t let myself be exposed as a pervert.

“This program’s boring. Let’s watch something else.”

My girlfriend said, and the remote was under his girlfriend’s leg.

I naturally lifted her ankle. “Here’s the remote,” I said shyly, picking it up.

She covered her mouth slightly, laughing in embarrassment.

When she shifted her hips to sit again, I unconsciously moved my leg closer to her ass.

Why did I do that? Why…? Ah… so soft…

She sat down, her plump ass pressing onto my ankle. Her eyes widened like a startled rabbit.

I remembered something I’d seen somewhere. Quietly, I raised one finger to my lips.

Be quiet.

She understood instantly and said nothing.

Courage? No. Instinct. The primal urge of a male—of a man—to feel the soft, warm ass of a female.

“Where’s my… my headband?”

His girlfriend suddenly stood up and hurried toward the spare room. I saw my chance.

I stood up too. “I’ll find it for you. It’s dark in there.”

Ridiculous. This was a house, with lights and electricity. But I said it anyway.

My friend and my girlfriend laughed, amused.

I couldn’t just leap up—it had to look natural. I assessed the situation.

No one paid attention to his girlfriend in the spare room.

Touch her. Rub her. Push inside.

The thoughts flooded my mind. I imagined exactly where, how—just the fantasy was enough to excite me.

I opened the door to the spare room and glanced back.

My woman and his were still absorbed in the TV. The door to the spare room opened, and she crouched down, her eyes wide again—like a frightened rabbit.

“Ah…”

My lips crashed onto hers, one hand gripping her ass.

Was this real? Or just a dream?

Lost in my own fantasy, I stepped closer.

She backed away. Alluringly…

Was she scared? Every time I approached, her ass slid backward across the floor.

“I won’t eat you. Don’t worry.”

There’s a saying—if you feel it’s right, move forward. I wanted her. And I wanted my friend to defile my woman.

Her arms, slender and beautiful, obeyed instinct. But the real question was—how to claim her?

The closer I got, the more irresistible she became. The scent of her shampoo, rising from her long hair…

“Please…”

I whispered, pleading—but please held so many meanings.

“Don’t scream. Just once… just once, let me touch you.”

No force on earth could have stopped me now.

I couldn’t breathe.

One hand gripped my swollen cock, straining against my pants.

My friend and my woman had no idea what I was doing—couldn’t even dream of it.

They must never know… And my woman must be taken by my friend.

Maybe “please” carried denial, but beneath it, acceptance.

“This… this isn’t right…”

His girlfriend begged, pleading for mercy. I ignored her, obeying only my instinct.

“Shh.”

One hand on my cock. The other grabbing her breast. I was this aroused—she should beg me to fill her wet pussy.

The reason was simple.

“You’re my friend’s woman.”

Was heaven on my side? She yielded. Slowly… so slowly… she began to accept my kiss. My lips sucked gently at her upper lip.

“Smack… smack… smack…”

Would they hear? Would they realize I was defiling a woman right now? My heart pounded.

I was excited. So excited my heart might burst. Good. Yes. What should I do?

“Just once… save me…”

As I pressed her, she winced, confused, unsure what to do.

Then, from the living room, my friend shouted.

“Didn’t find the bag?”

What a mood killer. I’m trying to fuck your woman, and you’re ruining it. You should be fucking my woman.

“Please… please…”

Her panicked voice only turned me on more. I grabbed both her breasts tightly.

Then I stood abruptly, lifting the sacred hands that had been squeezing her chest and moving them to the zipper of my pants.

Zzzzip…

It opened.

Look. Behold my thick cock. Be amazed.

“Hah!”

I wanted to cum right onto her shocked face. Now… now… in your mouth…

I grabbed her head, forcing my cock into her mouth, driving it deep.

My neck arched back as I felt it.

Instinct… Is this what instinct feels like?

“Ugh… ugh…!”

She struggled. Was it because my cock was too big? Good? Good? If you like it, say it.

But quietly. Don’t let them hear our moans.

“Don’t… don’t do this…”

I wanted to tell her not to beg. No—not to speak at all.

I couldn’t hold back. I wanted to pour every ounce of my strength into turning her into a whore.

Did they see us trembling through the crack in the door? My woman approached. We were about to be caught.

His girlfriend sat frozen, my cock still in her mouth, grimacing.

I had to let her go.

Quickly, I pulled out, zipped up.

The door opened. Creeeak.

“What are you doing?”

“Just about to leave.”

I brushed past my woman’s shoulder as I walked toward the living room. My friend called out, “Come on, let’s have a beer.”

His girlfriend sat dazed on the floor, unable to answer my woman’s questions.

“Are you feeling unwell?”

“…………”

“Your face is red. Are you okay?”

“…………”

Say something! You’re making us suspicious, you stupid bitch…

“Hey, buddy. We’re out of beer. Let’s get another round.”

No alcohol? Then you go buy some. I don’t want to. But I couldn’t say that.

“Honey, could you run to the store? I’m a bit tipsy—hard to move.”

My woman understood my hint and stood to leave. Thank you.

“Oh? Then I’ll go too. I need to buy cigarettes. Ran out earlier—gotta smoke one.”

My friend stood up too. Perfect. Disappear. All of you.

“Be careful.”

They opened the front door, laughing as they stepped out, promising to return soon.

The door closed.

Clang!

It shut. Shut. Shut. Shut.

My eyes sharpened. Without turning, I felt her presence behind me.

She already knew. Her expression said, Come on.

With each step I took toward her, she scrambled backward, kicking.

“Ugh!”

My forced kiss. She accepted it meekly, then grabbed my head, resisting fiercely. But I wouldn’t back down from this pain.

You’ve already taken my cock in your mouth. This time, I’ll eat your pussy and fuck you deep.

“Kyaa!”

Her scream excited my lust. I lifted her short skirt, pulled down her panties.

Pure pussy! No hair. Where did it go?

My tongue raced from her anus to her urethra like a car on a highway. Sllllurp…

The mix of musky scent and arousal stimulated my senses.

I did it over ten times. Then stood again.

My cock—huge, without hesitation—plunged into her hole.

“Ugh!”

Delicious. Her tight pussy squeezed and pressed against my cock. She reacted to my movements.

Does she want me? Personally, I love doggy style—because her ass looks so damn beautiful from behind. So good.

I turned her, stared at her anus, then thrust my cock hard into her pussy.

She winced with each thrust.

I wanted to crush her.

I gripped her ass tightly with both hands, spreading and squeezing like tofu.

Back and forth, my hips pounded between her ass cheeks.

“Hah… hah… hah…”

Her moans rose with my rhythm. As if amplified by a megaphone, sexy sounds poured from her parted lips.

But I was in a hurry. They’d be back soon. I had to cum fast.

I had to fill her pussy with my cum.

Focusing, I pulled her legs together, trapping her ass in a net of pleasure, and fucked her harder.

Thud… thud… The sound was crisp. The louder it got, the louder her cries became.

“I’m… I’m about to come. Can I cum inside?”

“No… not today…”

Internal ejaculation is the ultimate pleasure.

She said no, but I wanted to cum anyway. I wanted to fill her pussy with my milky white cum.

Coming… coming…

“Ugh!”

I couldn’t control my neck as it arched toward the ceiling. She must have felt it—my hot cum flooding her.

“No, I said no!”

She twisted her hips, trying to pull my cock out of her pussy. It only turned me on more.

I collapsed backward, panting.

I closed my eyes, grateful and satisfied for having eaten her pussy.

Huh? What’s that sound?

I slowly opened my eyes.

Her breasts were on my face. She was staring through the cracked door, watching something.

I followed her gaze.

My woman was sucking his cock. Sucking? Really?

She spread her legs wide, welcoming my friend’s cock, moaning in ecstasy. What the hell?

I was curious, but after cumming, I felt satisfied. The sight of my woman moaning like that was strangely fascinating.

We watched them. I grabbed her breasts. She stroked my cock with her hand.

“Should we leave?”

“No. Wait.”

The sight of my woman and his man fucking was strange, yet thrilling.

Seeing it, my cock rose again. I grabbed her, flipped her over, and thrust my cock back into her pussy.

“A…”

Her soft, low moan. My fast thrusts made her cry in harmony with my woman’s moans.

Then, overcome with excitement, I slammed into her hard.

“A!”

Was that too loud? My friend, who was fucking my woman, turned and looked back.

Our eyes met.

We didn’t care. We switched partners and kept fucking.

“Whose pussy did you eat if not mine?”

She asked him, riding my cock.

“Why are you eating another man’s cock instead of mine? I love this pussy too.”

“Mmm. This cock tastes good too.”

We both reached climax at the same time.

Without waiting for who came first, we pulled out and rushed back to our original partners, gripping their cocks.

When I stood before her, she smiled and took my cock into her mouth. Then I came.

My friend shook his cock in her face and came all over.

We burst into wide, joyful laughter.

Hahaha… hahaha…

“Hey… hey! Wake up!”

Huh? What?

I rubbed my eyes, sitting up from the couch. A dream?

Heh… heh… Was it an enjoyable dream? Or a déjà vu of a new experience? I wonder what’s going to happen next.