Parallel World: Estrus Korea (1)

Monday afternoon. I was walking around campus when I sat down near the fountain and started fiddling with my phone. While browsing the Doldol Wiki that Taeyoung had told me about, I somehow ended up reading the entry on "estrus."

At first I was just looking for some light exercises I could do in the dorm, but after clicking a few related links, I found myself reading about estrus without even realizing it. Still, it was fascinating. Apparently every other mammal has an estrus cycle, so why don't humans? Did we used to have one and then some common-sense alteration wiped it out? It would be pretty entertaining if we did...

"No, wait. I was supposed to be looking for light exercise ideas and somehow got completely sidetracked."

I forced my thoughts back to exercise. There was a gym in the basement of the dorm, but I wasn't a fan of weightlifting. The only "exercise" I did on campus was strolling around. It barely counted as real exercise. Because I used to avoid physical activity, I'd had a bit of a belly once. Lately, though, that belly had completely disappeared—thanks to an unexpected weekly routine of several hours of hip exercises (?). It wasn't just fat loss; I could feel actual muscle forming on my abs.

"Well... muscles showing up isn't strange when you're thrusting your hips for an hour straight each time..."

During quests I moved my lower body without even noticing the strain. Just like other people worked out to music, I moved my hips to sweet, melodic songs. The muse singing those songs was usually pinned beneath me. The harder I thrust, the sweeter the melody she let out. That melody became the fuel that kept my hips moving.

"Speaking of which... these pants are really tight..."

While casually strolling across campus like usual, I felt an unfamiliar discomfort. My outfit was the same as always: a loose T-shirt, jeans, and sneakers. The problem was the jeans. The discomfort came from my lower half. The cause was simple—the massively enlarged penis I'd gained from quests. It was bulging prominently inside my jeans, proudly displaying its size. Sitting on the bench, I looked down at it and smiled faintly. The tight jeans were uncomfortable, but strangely satisfying. My confidence as a man had swelled to new heights.

Just then, a group of male students walked past the bench and let out low exclamations.

"Whoa... fuck, she's insanely pretty..."

"Huh? Who?"

"Over there. By the fountain."

"Oh... yeah, she is."

Who were they looking at? Naturally, my gaze followed theirs toward the fountain. A familiar female student was walking past it. Lee Ayoung. The girl who worked part-time with me at the student support center. She wore a white tennis skirt and a blue pleated shirt, canvas shoes on her feet. One hand held a handbag, the other a large plastic bag full of snacks and drinks. Her short hair, with one ear exposed, suited her perfectly. She had a slender figure and an innocent, pure charm. Especially her calm yet moist voice that gave off a mysterious aura. I'd overheard her talking during our last shift—she'd taken ballet lessons for a few years as a child. Maybe that was why every gesture, every movement of hers seemed to carry an elegant dance line. A subtle grace radiated from her entire presence. That pure, clean appearance...

I found myself naturally captivated by Lee Ayoung as she passed the fountain. Her legs moved busily beneath the white tennis skirt. The flawless, smooth skin on her pale legs was enough to steal anyone's gaze. Lee Ayoung wasn't just innocent-looking. Her clean skin and clear, beautiful voice carried a fresh, vibrant charm. Even now, the smooth legs moving beneath her tennis skirt were stealing glances from other men.

"Her skirt seems a little short..."

The tennis skirt revealed her thighs just above the knees. The short hem showed off the shape of her legs without any modesty. Male students passing by kept glancing back at her. She seemed to be heading toward the women's dormitory, which was right next to the men's dorm. Direction-wise, it made sense.

"Oh."

Had she unconsciously felt my gaze? She suddenly looked around. I quickly averted my eyes before they could meet. Still, I could feel her gaze turning toward me. The moment she spotted me, she changed direction and started walking over.

"What... what now? Did she catch me staring...?"

Contrary to my anxious thoughts, Lee Ayoung's calm and gentle voice reached me.

"Hello~ Senior Juwan."

She greeted me with her usual calm, clear voice and a bright smile. That radiant smile and those large, clear eyes...

"She didn't... catch me, right?"

Seeing her attitude, I let out a quiet sigh of relief inside.

"Uh... yeah. Heading back to the dorm?"

At the beginning of the semester I'd always called her "Miss Ayoung" stiffly, but now I could speak casually. Thanks to the quest that had raised our intimacy, of course. Without it, I'd probably still be calling her "Miss Ayoung."

"Senior Juwan, what are you ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠doing here~?"

"Just resting because the weather's nice. What about you?"

-Rustle.

Lee Ayoung lifted the plastic bag in one hand to show me. It was stuffed with snacks and drinks.

"I bought some stuff to eat with my roommates after class."

"Ah... I see."

"Ah... this is getting dangerous..."

The pure, beautiful Lee Ayoung. Talking with her always made my heart race. But right now I felt strangely flustered. The reason was simple: her white tennis skirt and the flawless, smooth legs visible beneath it. Because the skirt was slightly short, every breeze made the hem flutter, revealing the tops of her thighs.

"Hoo..."

My eyes kept drifting downward. It felt like my gaze was being pulled by a magnet straight to Lee Ayoung's legs beneath the skirt. I was trying my hardest to hold back with sheer willpower, but my animal instincts kept directing my eyes toward her beautiful legs. What if I accidentally glanced at them during our conversation and she noticed? The atmosphere would become incredibly awkward. I exerted every ounce of self-control to keep my eyes from dropping.

Whether she knew what was going on in my head or not, Lee Ayoung looked around while agreeing that the weather was nice enough to be outside.

"You're right. The weather really is lovely~"

Bright sunlight. Green grass. Clear sky. And fluffy white clouds drifting across it. She admired the scenery and agreed with me. While she was looking around, my forcibly restrained gaze slipped downward on its own. Smooth legs with flawless skin. Calves tracing beautiful curves. Slender ankles. Releasing the instincts I'd been desperately holding back, my eyes greedily traced Lee Ayoung's legs. They were practically licking her smooth skin.

-Whoosh.

When Lee Ayoung turned her head back after looking around, I quickly raised my eyes to meet hers again.

"She doesn't know, right?"

I hoped she hadn't noticed that I'd been staring at her legs.

"Oh, Senior Juwan. Thank you for last time."

"Huh? For what?"

"Yena. You helped keep her from drinking. She can't handle alcohol very well."

"Ah... it was nothing..."

It was probably about the freshman welcome party. That day I'd played the black knight three times to stop Song Yena, Lee Ayoung's roommate, from drinking. Of course, it wasn't because I wanted to help the freshman from ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠our department. It was because of the quest—the one that rewarded black-knight actions. Thanks to that, I'd been rewarded with sex with Yena in the empty lot beside the bar that night. I'd taken Song Yena's virginity. The memory of her hairless, immature pussy and the sensation of my cock roughly pushing inside was still vivid.

"I drank too much that day and couldn't look after her. Thank you for taking care of her... If it weren't for you, Senior Juwan, something bad might have happened."

Lee Ayoung kept praising me. She seemed to care a lot about her roommate Yena. Come to think of it, Yena and Lee Ayoung got along really well. Every time I saw them, Song Yena was ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠stuck right by Lee Ayoung's side.

"Yena... seems to really like you. She's always clinging to you whenever I see her."

"Ah. She probably sees me as an older sister. Since she's always attached to me, I've grown quite fond of her too. Hehe."

Song Yena seemed to follow Lee Ayoung around a lot. Because Yena was so small, she looked like Lee Ayoung's little sister. Even though Yena was short, she had a beautiful face and well-proportioned body, like a living doll.

"There are other seniors in the dorm room, but she only clings to me like that. So I think I've grown even more attached to her."

Lee Ayoung continued speaking in her usual calm, moist voice. She lived in a four-person room in the women's dormitory. And every single one of her roommates was a beauty. The pure and charming Lee Ayoung. The small, doll-like Song Yena. Park So-yeon, with her fox-like face and seductive aura. Yoon Eun-sol from the physical education department, with her toned thighs and healthy, vibrant skin tone. Each had their own unique appeal.

Lee Ayoung had probably come over just to thank me for helping Yena the other day. Even while talking and making eye contact, I kept fighting the urge to let my gaze drop to her long, pale legs stretched out below. Getting caught staring at her legs mid-conversation would ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠be disastrous. At this point, I was almost starting to resent her.

"Seriously, why is she wearing such a short skirt..."

Her thighs were half-exposed beneath the tennis skirt. And any man's instincts would naturally be drawn there. Unless I consciously fought it with every bit of willpower, my eyes would drift downward on their own. What had Lee Ayoung been thinking when she put on a skirt that revealed half her thighs? To look pretty? To attract attention? Or had she instinctively chosen clothes that would seduce men? Maybe she enjoyed making men aroused and watching their reactions?

All sorts of wild thoughts swirled in my head.

Just then—

"What?"

A quest had suddenly appeared. I'd done a similar quest before.

"Senior Juwan, I'll be going now~ See you at the student support center tonight."

"Huh? Oh... bye~"

Lee Ayoung ended the conversation and headed toward the women's dormitory. I ignored the quest window and watched her retreating figure. Slim waist. The round swell of her hips beneath the skirt. Smooth legs peeking out from under the short hem. The moment she could no longer see me, my gaze greedily devoured her back view.

"Hoo... let's check the quest now."

Once Lee Ayoung was far enough away, I turned my attention back to the quest window.

"A parallel world... Oh... two hours?"

I'd visited a parallel world once before. It looked very similar to the world I lived in, yet was completely different. Back then there had been three keywords on the quest window. I'd chosen the "Class" keyword and traveled to that parallel world. This time it seemed I could choose one of three keywords to enter a parallel world.

"I guess each keyword leads to a different parallel world... Huh?"

One of the keywords suddenly caught my eye. It was the first option: "Class." The same keyword I'd chosen for my first parallel world. In that world there had been a class system. I was a nobleman and Lee Ayoung had been my slave. I'd used her to satisfy my sexual desires. It had been... quite enjoyable.

"Going to the parallel world with the class system wouldn't be bad either... Hehe."

An instinctive lecherous smile formed on my lips. The image of beautiful Lee Ayoung from earlier was still fresh in my mind. The pure, mysterious Lee Ayoung. A world where she was my personal slave. Choosing the "Class" parallel world wouldn't be a bad idea. My finger moved toward the first option, "Class," as if drawn by a magnet.

"Huh...?"

Just then, another option caught my attention again. "Estrus." It was the third parallel world keyword I could choose. The most explicit... and lewd keyword of all. My interest naturally shifted toward the "Estrus" option. The second keyword, "Zombie," was there too, but it didn't interest me at all. A world with zombies? Zombies were fun in movies or games, but I had zero desire to go to a world that actually had them.

"Hoo... 'Estrus'..."

My interest was increasingly drawn to "Estrus." Come to think of it, I'd just been reading about estrus on Doldol Wiki while sitting on the bench earlier. Wondering why humans didn't have an estrus cycle when most mammals did. If I chose the third option, "Estrus," I'd probably be transported to a parallel world where humans did have estrus cycles.

"Alright. I've already tried 'Class' before. This time I'll go with 'Estrus.'"

I firmly pressed the third option.

-Flash.

In an instant, a blinding light filled my vision.