Parallel World: Estrus Korea

I pressed firmly on the third choice: Estrus Period.

A brilliant flash of light filled my vision for an instant. When it faded, the scenery looked completely ordinary. Then, a flood of text windows popped up one after another.

"Ugh… what the hell is this?"

After arriving in the parallel world, a barrage of notification windows appeared. The sudden flood of text was enough to throw me off balance. Still, there seemed to be fewer windows than last time. I read through them carefully.

"From what I can tell, this really is a world with estrus cycles, huh?"

And only women went through them. The idea of women's sexual desire running wild at certain times sounded like a pretty enjoyable parallel world.

Just then, a broadcast echoed from the speakers installed around campus. Normally they just announced simple school news or played music, but here the announcement was something else entirely.

"This is a campus-wide announcement."

"This week is the female students' estrus period."

"During the estrus period, all women are recognized as being in a mentally and physically weakened state."

"Any sexual crimes committed by female students during this period will not be punished."

"Therefore, male students must exercise careful attention to prevent any unfortunate incidents."

"We repeat: this week is the female students' estrus period."

"Male students are advised to remain vigilant to avoid any unfortunate accidents."

"What the…?"

The campus broadcast was hard to process. Female students committing sexual crimes? Why did we have to be careful about that?

At that moment, a familiar voice called out from beside me.

"Hey, hyung!"

It was Kim Taeyoung, my chubby roommate. I turned my head toward the sound while sitting near the fountain, and there he was—wearing a loose apron skirt. The sight of chubby Taeyoung in a skirt was pretty horrifying.

"What the fuck? Why are you wearing a skirt?"

"Hyung, what are you doing? Why are you wearing jeans again!?"

"…Huh?"

The sight of Taeyoung in a skirt made profanity slip out before I could stop it. I almost never swore, but his appearance was enough to trigger it. Yet Taeyoung looked shocked at me instead. The reason was absurd: he was horrified that I was wearing jeans.

"Bro… it's estrus week right now! You have to be careful… why do you always wear jeans?"

"What does estrus have to do with skirts?"

"…What?"

I couldn't understand a word Taeyoung was saying. I genuinely had no idea what women's estrus cycles had to do with men wearing skirts. Taeyoung stared at me for a moment, then started explaining with a look that said, "Do I really have to spell out something this basic?"

"Hyung, think about it calmly."

"…What?"

"If you wear jeans… people can roughly tell the size of your dick, right?"

"Uh… yeah, probably…"

Tight jeans. Now that I thought about it, if someone looked closely, they could probably tell whether it was big or small. And… it's huge, alright.

When I ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠glanced down, I could feel the massive bulge of my cock straining against the denim.

"Come to think of it, I won't be able to wear jeans even after I go back to the original world…"

While I was lost in thought, Taeyoung continued.

"Then girls in estrus will get excited when they see the size, right?"

"Hmm… I guess so?"

"Of course! They might even get wet for real…"

"Now that I think about it, the broadcast mentioned female students committing sexual crimes…"

Was that… a bad thing? I seriously considered it. If a pretty girl tried something weird with me, I was more than willing to go along with it. Hell, I wanted it to happen. And if some girl I didn't like made a move? Well, at least as a guy I wasn't in any real danger. Right now, I didn't feel the slightest bit of risk.

Just then, a moist, calm voice whispered near my ear.

"Haa… Juwan-sunbae… are you busy?"

"Huh?"

It was Lee Ayoung. I hadn't noticed her approach while talking to Taeyoung. She was suddenly right behind me, speaking in a strangely moist and seductive tone. I turned from Taeyoung to face her.

"No, I'm free… why?"

"Um… Juwan-sunbae… just for a moment…"

—Swish.

The moment she heard I was free, Ayoung leaned in close and whispered into my ear. Her breath tickled my earlobe.

"Juwan-sunbae… would you like to come play at the girls' dorm with me for a bit?"

"Uh… huh? …Uh…"

Ayoung usually had a pure, calm aura. Her voice was normally clear and clean, pleasant to listen to. But right now it was different—moist, soft, a little lewd, like she'd just woken up. Hearing that voice so close made my head feel hazy. Without thinking, I agreed to go to the girls' dorm with her.

When I glanced sideways, I saw her face flushed bright red. From the earlier info windows and the broadcast, I knew exactly what this meant: Ayoung was currently in estrus. And she was trying to seduce me.

Taeyoung, who had been watching us, spoke up with a shocked expression.

"What the hell are you talking about? No thanks. Hyung isn't going anywhere."

He was trying to cut ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Ayoung off. I calmly told him, "Taeyoung, I'll just go hang out for a bit. Don't worry."

"Hyung, are you crazy? Where do you think you're going? This is dangerous."

"Crazy? The only crazy thing here is your visual…"

I swallowed the words I wanted to say while looking at Taeyoung in that apron skirt. It was the kind of sight that could give you nightmares. Strangely, it also pissed me off a little—because he looked oddly like my aunt in that outfit.

I tried to reassure him. "It's really fine, don't worry. She's someone I know well~"

Only after repeating that everything was okay several times did Taeyoung finally let me go. Ayoung took my wrist and started leading me toward the girls' dorm.

"Haa… Juwan-sunbae, this way."

Her soft hand gripped my wrist. I could see her profile as she guided me—smooth, clean legs beneath a short tennis skirt, her elegant neckline, her short hair swaying with each step, her clean ear adorned with a pretty earring, and her flushed red face.

As we walked, I asked a few questions.

"The girls' dorm… we're going to your room?"

"Yes…? Yes…"

Her dorm room. I'd never been there before. But I had met her roommates. The day we swapped roommates through a quest, I'd spent time with Ayoung, Shin So-yeon noona, and Yoon Eun-seol in my own dorm room. The memory was still vivid.

While thinking about them, I asked Ayoung, who was still holding my wrist, "By the way, are your roommates there too?"

"Oh! Ah… no… they're all in class right now. No one's there…"

Apparently the room was empty. Just Ayoung and me. We'd be spending time there alone. Ayoung still looked flushed and impatient.

"Hoo… no need to rush."

What was Ayoung in estrus thinking? What was going through her mind as she led me to her room? All sorts of fantasies flashed through my head. Whatever she wanted, I was ready to go along with it. My heart started pounding in sync with her increasingly heated breaths.

"Hoo… just a little farther…"

Ayoung spoke while catching her breath as we climbed the hill. Before long we arrived in front of the girls' dorm. As I followed her inside, I noticed several female students glancing at me—specifically at my jeans.

"Are they… looking at my crotch?"

Every girl who stole a glance couldn't take her eyes off the bulge in my pants. A few even wore lewd smiles. Then two pretty girls linked arms and passed by us. Their voices drifted from behind.

"Whoa… did you see that?"

"Yeah… it's fucking huge…"

"I wish I could suck ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠something like that just once…"

"Pfft. Who's gonna let you?"

"…Are they talking about me?"

Despite their pretty faces, the girls were saying filthy things about me. It was a little embarrassing—I'd never heard anything like it before. While I was still marveling at the reactions around me, I found myself following Ayoung into the girls' dorm. Soon we stopped in front of a room on the second floor. Ayoung stepped aside slightly, as if waiting for me to open the door.

I stood in front of the dorm room entrance. The moment I grabbed the handle to open it, my heart was pounding wildly. What kind of time would I spend with Ayoung in this room? What kind of scene would unfold here in thirty minutes? All sorts of lewd fantasies raced through my mind.

So lost in thought, I didn't notice Ayoung moving behind me. The moment I opened the heavy door, she suddenly pushed me inside.

—Creak.

—Whoosh!

"Wha—!?"

Hands reached out from all around, grabbing me.

"Uh… what… what's going on!?"

The room wasn't empty. Ayoung's roommates were all there: Shin So-yeon noona with her fox-like face and sharp demeanor, Yoon Eun-seol with her toned thighs and healthy tanned skin, and petite Song Yena with her doll-like appearance. Before I could react, they grabbed me and threw me to the dorm room floor. I tried to push myself up from the prone position, but someone sat on my back. A familiar voice came from behind.

"Hehe. We finally caught you."

"…What?"

It was Yoon Eun-seol's voice. The athletic girl with thick, firm thighs and a healthy tan. Whether from all the exercise or natural genetics, she had that sun-kissed skin tone and slightly cute eyes with no double eyelids.

"Huh?"

I felt someone pulling off my shoes from the entrance area. A beautiful voice came from near my feet.

"U-um… unnie, I took off Juwan-sunbae's shoes…"

It was Song Yena's voice—the petite, doll-like freshman from our department.

—Press.

Someone else grabbed my shoulders with both hands and pushed down. When I lifted my head with effort, I saw Shin So-yeon noona pressing on my shoulders, her fox-like face framed by round silver glasses. Despite her cool, haughty image, there was something oddly cute about her.

—Click.

The door shut and locked behind us. Yoon Eun-seol spoke toward the entrance.

"Good job, Ayoung. As promised, we won't touch your boyfriend."

"Yeah… thanks…"

They dragged me to the center of the room. I ended up lying on my stomach in the middle of the dorm. So-yeon noona pinned my shoulders, Eun-seol sat on my lower back, and Ayoung and Yena held my legs so I couldn't resist. I had no idea what was happening.

I lifted my head slightly and spoke to So-yeon noona, who was still pressing on my shoulders.

"Uh? Uh-uh? H-hello? I thought you all had class… you're here…?"

Ayoung had said the room was empty. Had she gotten confused? While I was still flustered and asking questions, a voice came from behind me. Yoon Eun-seol, sitting on my back, grabbed both my arms and pulled them behind me.

"Hehe. Oppa, you still haven't figured out the situation? You just followed Ayoung like a puppy when she called you… are you that innocent? Or just stupid? Hehe."

Eun-seol's voice was filled with joy, like a hunter who had finally caught big game. When I turned my head slightly, I saw her firm, smooth brown thighs pressing against my waist from both sides. Her ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠voice came again.

"Oppa… you're about to get gang-raped by us now… hehe."

"Uh… yes…?"

Completely flustered, I accidentally used polite speech with her. Yoon Eun-seol cheerfully announced that she was going to gang-rape me.