Side Effects [Yoo Seol-ah]
In our party, the most annoying member was Naid, and the one who tugged at my heartstrings the most was also Naid.
He'd pick pointless fights, play endless pranks, and nitpick things that could easily be overlooked. Honestly, if his face hadn't been exactly my type, I would've just been pissed off all the time. Ah, but that lean build with subtle muscle definition, those slender, long fingers, the occasional pointless consideration he showed, and how he'd turn dead serious in battle unlike his usual self...
...Anyway, ignoring all that, I couldn't exactly call his personality great.
But because he wasn't bound by any rigid etiquette, it actually made it easier for me to open up to him. After hearing we couldn't go home unless we defeated the Demon King, I'd been on thorns constantly, icing him out coldly, but he was always the first to approach me.
Starting with Naid, I eventually got close to the whole party, and things became genuinely fun. They were all so strong that I was convinced we'd definitely beat the Demon King. Life-or-death battles were grueling, no doubt, but being with my party made even those times feel positive. We trusted each other completely, especially sharing everything battle-related.
It was a fact everyone acknowledged: I was the strongest in our party. At first, I didn't believe it when I was summoned to this other world, but I quickly realized my talent for magic was off the charts. My mana reserves, computational ability—everything was a level above other mages.
So I always had confidence in my magic. But that day, my confidence turned into poison.
About a year before our return, we faced off in a decisive battle against Kairos, one of the high-ranking demons we called the legion commander. The plains were already littered with the corpses of lesser demons, leaving only the final fight.
I was sure we'd win, but he wasn't an easy opponent. Believing quick battles were best, I unleashed full firepower from the start. Victory was inevitable, but in the closing phase, pouring most of my mana into taking down the tenacious Kairos was the problem.
To block the pitch-black spear he hurled in his dying moments, I layered multiple defensive spells. But because I'd overexerted my mana on that last attack, the spear's sharp tip shattered every barrier.
I couldn't dodge. Biting my lip as the spear hurtled straight for my heart, I closed my eyes.
Pfuk.
The sound of flesh tearing rang out, but no pain followed. Slowly opening my eyes, I saw Naid's back—and the spear tip protruding from behind him, soaked in blood from completely piercing his abdomen.
"...Guided magic, huh. Can't even fully deflect it."
Naid turned, gripping the spear's shaft embedded in his gut with one hand. A wry smile crossed his lips.
"Why..."
"Without you... urk!... we can't kill Magnus."
I rushed to support the staggering Naid as Kain and Aris came sprinting over. Aris was spamming healing spells like mad.
Naid pressed a finger to his chest a few times with his free hand, then yanked the spear out in one go. It vanished instantly, and blood gushed from the round hole alongside black smoke.
Leaving recovery to Aris, I desperately channeled my mana to purge the demonic energy.
"Abdomen hit—no threat to your life. Whew... that was really close."
My heart, pounding like it would burst, slowed a bit at Aris's words, but it still wouldn't calm. As Naid hunched over, catching his breath, a slightly playful voice came.
Our eyes met, and thankfully, his complexion didn't look too bad.
"The spear hit you, though?"
With the demonic energy gone, the pierced area began healing rapidly. It was all my fault. I should've played it safer. If I'd always kept a reserve of mana like usual, this never would've happened. Entirely my mistake.
"Sorry... I'm so sorry."
"I was just joking to lighten the mood..."
I knew he was doing it on purpose to ease my guilt. That's why—that's Naid. I never wanted to put him in that position again.
After that, I was extra cautious in battles to avoid any risks, and I threw myself into magic research. My mana was already incomparable to other mages, but I sought every way to increase it further.
Endless battles followed, deepening our party bonds. Finally, our last battle with Demon King Magnus ended our long journey.
Returning home was joyful, of course. But I couldn't smile. The thought of parting from my party—from Naid—shook me to the core.
As I stood there sorting my feelings, I sensed someone behind me. Glancing back, Naid met my gaze steadily.
"Wanna get married?"
His tone was casual, as always. But his eyes were earnest.
We'd always prioritized battles, so despite the clear emotions between us, taking that next step had been impossible. I'd often thought that if we'd met on Earth, in a peaceful world, we'd be dating normally by now. Bickering a lot, sure, but exchanging even more affection.
I knew I shouldn't get more attached before parting, but I couldn't refuse. His light tone belied the sincerity in his eyes.
And so began our brief wedding and vows of love. But seriously, why... why kiss the back of my hand?
He always did this pointless consideration. His gaze would subtly scan my chest other times, so he clearly wasn't uninterested, yet if battle damage tore my clothes exposing skin, he'd never let his eyes drop below my face. Was he pretending to be a gentleman until the end? Or just acting mature?
A lip kiss would've been fine. No—honestly, that's what I wanted. This made me seem like the eager one...
His casual attitude usually kept a line drawn, and it irked me this time. I'd answered Aris's eternal love question without hesitation, grabbed Naid by the nape, stood on tiptoe, crashed our lips together, and invaded his mouth.
Naid's eyes widened, freezing solid. Seeing him—who always kept some composure— like this gave me a strange thrill.
As our tongues tentatively entwined, I realized a kiss alone could feel this good. Was it my body, or the side effect Karote mentioned? The dual pleasures made my vision blur.
First time, so I didn't know how to properly French, but instinct took over. I explored his mouth thoroughly for a good while.
The urge to push him down hit, but reason flickered back—two people are watching. I barely tamped down the sudden shame. Moments later, Naid said something unimaginable.
He was a summon from Earth—Korea, no less. Before my stunned self could respond, he bid farewell and vanished like he'd never been there. Seconds later, I was back on Earth too.
First things first: back to daily life. As a college freshman, I attended events and resumed illustrating. My mind worked faster now; I could magic up virtual layers or objects to reference, speeding up my workflow after a short adjustment.
I indulged in cosplay I'd eyed for ages, snapping pics too. Nearly perfect normalcy—except for the boiling libido.
I'd never been low-drive, and subculture diving gave me overflowing knowledge there, but post-return? On another level. Knowing he was in the same Korea made fantasies run wild, overflowing my desires. Blame Naid.
My body was hypersensitive too—chest play alone often made me climax without touching below. Imagining him forcing me or me leading had my lower belly tingling, costing me full nights. Yet no full satisfaction, even after peaks. Frustration piled up, illustrations slipping from my grasp.
Then came the first meeting of the club I'd joined—the intro appealed, and their take on my fave tsundere chara Haruru swayed me. Tsunderes always pulled at me.
Entering the room, my eyes locked with Naid's—no, Baek Sion's. Joy, shock, ecstasy surged, alongside lust raging in my head.
I sat glued to him, legs crossed in my short knit dress to draw eyes between my thighs. His playful nature remained, but without battles demanding coolness, he was vulnerable to seduction. His gaze roamed my body, even peeking inside the dress. Superiority and filthy fantasies accelerated.
But Aris and Kain joined, killing the lust window. Sharing stories over good food and drinks in this peaceful world flew by.
Night deepened; time to go. Dozing on the bus, I woke leaning on Baek Sion's shoulder. No idea how long, but he seemed fine. Heart pounding till we got off, winter chill cooled my flushed face.
At parting—despite my "it's fine"—he insisted on walking me home. I resolved then. He accepted my "let's drink more," and I stalled buying booze.
Home, I yanked down shorts and panties; transparent, sticky fluid strung a line in the air. No clue when it started, but prepping for fantasized nights with Baek Sion.
Gray panties—popular, wetness-visible—I wore those, skipping shorts, covering with the dress. Magic eased pain only, fearing mood-killers. He'd played hardcore eroge Ordinary Daily Sex Life, same otaku level as me—no deflowering fantasies.
Baek Sion arrived; chatting was fun, timing hard. Rummaging for snacks, I found a receipt—sis's convenience store habit. Booze, snacks, bottom: Sagami 0.01.
Unfamiliar brand, but .01 screamed condom. I grabbed a snack casually, face heating—but booze hid it.
Blunt "let's do it!" felt off. Didn't wanna seem too eager. (Seo-yeon's slips and my reveal kinda exposed my sex life anyway.) Ideally, he'd pounce. Wedding non-kiss lingered; fantasies of him forceful satisfied my tastes. Maybe he liked demure types.
Pretending sleep for exposure was tough, mortifying. Praying shame wouldn't kill it, sensing him grab my pants waist, I inwardly cheered nice!
But why stop? Condoms bought—he wanted it. Making me the eager one again. Club talk turned lewd, he played coy, yet snuck condoms. After bold seduction, quitting last-second? Infuriating.
Am I not attractive? Teases my height—thinks I'm not womanly? But condoms... pants tugged...
Why, why...? Focus slipped. Shame maxed—no worse. Passive failed; time for perfect virgin bitch act with otaku knowledge.
I seized control, pinned him to bed, straddled his crotch. Huge size throbbed through clothes, pressing mine exactly. Rage and lust exploded—no holding back.
High-level dirty talk from the start, cooking him. Worked better than expected. Otakus love virgin bitches? His cock twitched at my teases. Ugly pleasure on his face from my amateur hips. Biting lip to stifle moans—sight soaked me.
Am I S-dominant? Tormenting him flooded my brain with mental bliss. Especially his first cumshot over panties—lewdness and sensation made me cum lightly. Virgin him probably missed it.
Worlds beyond solo. Sex with your fave is different, true. Full insertion and creampie—how good? First, reclaim pride dented by him: hid no-pregnancy, demanded creampie.
His surrender after resistance? Conquest thrill. Teasing his flustered reveal? Delightful. Sexual, yes—but mental high of dominating him was huge.
At true insertion, something wrong. Loved topping, but instinct screamed danger. Rubbed tip only. But delaying impossible—scorching.
Big resolve: inserted tip. Barely moved, near-climax. Lead? Whatever—time out! He thrust up.
Blacked out briefly; vision cleared to pleasure wave crashing. Lightning chill from core, ripping through body, scrambling mind. Control gone. Hips bucked wildly; his massive cock inside twitched endlessly, pleasure nonstop.
My sensitivity partly, but his lust converting straight to my pleasure—biggest issue. Collapsed on his chest, twitching long, then glared up in a lull.
Passive earlier—why sudden...? Ignoring my blame, he asked:
"...Yoo Seol-ah, did you absorb the mana you took from Karote?"
...How'd he know? His eyes on mine—pink irises gave it away.
We fought most demons, but not all served Magnus. Succubi harmed humans indirectly. Pink-eyed devils wrecked homes, tales said.
Succubus Queen Karote surrendered early. We didn't buy it blindly—sealed her mana in an orb regardless.
Battle-ready, she complied: "Better than dying. Especially with that silver-haired kid around—Magnus can't win."
Who're you calling kid? Her near-170cm height, massive tits—I bit my lip.
Mana-hoarder me prepped absorption. She blocked: "Humans eat that... heavy side effects. Not recommending, kid."
"What side effects?" Eyes twinkling: "Succubi meal is sex, right? Humans do it for love too. Huge gap—start lusting, no control. Super sensitive during love-making? Might not handle body."
How super? "Succubi eat partner's lust itself. Not just sensitive—detects all desire, converts to pleasure. Normal mind might go mad mid-sex..."
Blushing, she grinned: "What, kid likes that? Eager despite looks... side effect might be good..." Party's weird gazes hit me.
"Shut up. Not absorbing." But I kept it. Mana's always better more.
Party scouted; alone with her: "Normal human? Constant issues. Your monster mana? Fine normally."
"Then?" "Love-making? No escape. Literal love—your thing with Naid."
"What?!" "Lived dozens times your age—obvious. Deny it, I'll eat him? Handsome..."
"......"
"Cute. Your mana level? Manageable. Absorb if you want."
I pondered, absorbed the pink mana. Trauma nudged—no mana shortage repeat.
Her words: "love-making" meant both sex and mutual love. Stronger affection, worse effects.
This insane pleasure... how much do I love Baek Sion...?
Suddenly, his eyes darkened, gripped my waist, lifted. Unlike entry, glans scraped every inner wall exiting—nearly collapsed again, but his hands held firm.
Lust-filled gaze. Must pause. Mind mushy—instinct screamed break or disaster.
Plea failed. Shouldn't have teased... Regret drowned as he slammed deep again.