The cold wind howled across the open fifth floor, carrying misty rain that clung to our soaked uniforms like a second skin. Erico's body pressed harder against mine, pinning me to the thick concrete pillar. Her massive breasts squished warmly against my chest, the thin wet fabric of her blouse doing almost nothing to hide how heavy and soft they truly were. I could feel her stiff nipples dragging across my shirt with every breath she took.
My heart hammered so violently I was sure she could feel it.
"E-Erico… wait—" I started, my voice shaky, but she silenced me by grabbing the back of my head and pulling me into another kiss.
This one was deeper. Hungrier.
Her full, hot lips crushed against mine as her tongue pushed inside without mercy, licking and sucking at my own tongue with wet, obscene sounds that echoed slightly in the empty floor. Thick saliva flowed freely into my mouth, sweet and strangely addictive. I groaned involuntarily as she ground her hips forward, rubbing her crotch against the painfully hard bulge in my pants.
The crimson mark on my neck burned hotter, like a brand pressed deeper into my flesh. A strange heat spread from it, crawling down my spine and straight into my groin, making my cock throb even harder.
What's happening to me…?
My hands moved on their own again. I grabbed two big handfuls of her heavy tits, squeezing them roughly through the wet blouse. They were so incredibly soft — like warm dough overflowing between my fingers. I kneaded them greedily, feeling their weight, their perfect fullness, the way they jiggled and deformed under my palms. Erico moaned loudly into my mouth, the vibration traveling straight down to my cock.
"Mmm… yes, Ren," she whispered hotly against my lips, breaking the kiss for just a second. A thick string of saliva still connected us. "Touch me harder. They're yours tonight."
She stepped back just enough to start unbuttoning her blouse with trembling, eager fingers. One by one the buttons came undone until the wet fabric fell open, revealing her bare breasts completely. They were even bigger than I had imagined — pale, heavy, perfectly round with puffy pink nipples already rock hard from the cold and arousal. Rain mist made her skin glisten.
I stared, mouth dry, cock aching.
Erico smiled with wicked satisfaction at my reaction. She took my hands and placed them directly on her naked tits.
The moment my bare palms touched her warm, supple flesh, a jolt ran through the crimson mark. Pleasure flooded my brain like a drug. I squeezed hard, thumbs brushing over her stiff nipples, feeling their heat. They were so soft yet so firm underneath. I couldn't stop groping them, lifting their heavy weight, pressing them together, watching them spill out between my fingers.
Erico let out a low, throaty moan and arched her back, pushing more of her chest into my hands.
While I was lost in the sensation of her breasts, her hand slid down my stomach and boldly cupped the hard bulge in my pants. She squeezed my cock through the fabric, stroking it slowly.
"So hard already…" she purred, voice dripping with lust. "For a shy boy, your dick feels pretty big."
My face burned with embarrassment, but I couldn't deny how good her hand felt. She stroked me firmer, rubbing the length of my throbbing shaft while I continued playing with her massive tits, pinching and rolling her nipples between my fingers.
The rain roared louder outside. Thunder cracked somewhere in the distance.
Erico suddenly dropped to her knees in front of me, right there on the dusty concrete. Her wet hair clung to her shoulders and the tops of her breasts as she looked up at me with those hungry eyes. The crimson mark on her left arm glowed faintly in the dim light.
She unzipped my pants with practiced fingers and pulled them down along with my underwear in one motion.
My cock sprang free, rock hard and already leaking precum from the tip. The cold wind brushed against it, making me shiver.
Erico licked her lips.
"Finally…" she whispered.
She leaned forward, hot breath washing over my sensitive head, and—
Erico leaned forward and took the head of my cock into her hot, wet mouth without hesitation.
The sudden wet heat made my knees buckle. A broken moan escaped my throat as her soft lips wrapped tightly around my swollen glans, her tongue swirling greedily over the sensitive tip, licking up the precum that was already dripping out of me.
"F-fuck…" I gasped, my hands instinctively moving to her head, fingers tangling in her wet black hair.
She hummed around my cock, the vibration shooting straight through me. Then she pushed deeper, taking more of my length into her mouth until I felt the back of her throat. Her cheeks hollowed as she sucked hard, bobbing her head with shameless hunger. Obscene, wet slurping sounds filled the empty fifth floor, mixing with the roar of the rain and thunder outside.
She was drooling heavily. Thick strings of saliva ran down my shaft and dripped from her chin onto her massive bare breasts, making them glisten. Every time she took me deep, her throat squeezed around me while her tongue pressed against the underside of my cock.
It felt too good. Too intense. My hips twitched forward on their own, pushing deeper into her warm, sucking mouth.
Erico looked up at me with watery eyes, the crimson mark on her arm glowing brighter. For a moment her gaze seemed… wrong. Her pupils looked too large, almost swallowing the whites of her eyes. But the pleasure clouded my mind too much to focus on it.
She pulled back with a wet pop, gasping for air, a thick strand of saliva still connecting her swollen lips to the head of my cock.
"You're leaking so much…" she whispered huskily, stroking my slick shaft with her hand. "Does it feel good, Ren? Having the school's untouchable beauty queen sucking your virgin cock like a whore?"
Her dirty words made my cock twitch hard in her grip. She laughed softly and dove back down, sucking even more aggressively. One of her hands cupped my balls, gently massaging them while her mouth worked the upper half of my dick with wet, filthy sounds.
The crimson mark on my neck burned like fire now. Heat spread through my veins, making every sensation sharper. My balls felt heavy, aching with the need to cum.
I couldn't hold back. My fingers tightened in her hair as I started thrusting shallowly into her mouth. Erico moaned encouragingly, relaxing her throat and letting me fuck her face.
The pressure built fast — too fast.
"I-I'm going to…!" I tried to warn her, but it was already too late.
My entire body tensed as the first powerful spurt exploded into her mouth. Thick ropes of cum shot down her throat as my cock pulsed again and again. Erico didn't pull away. She swallowed greedily, milking me with her tongue and throat, taking every drop while her eyes stayed locked on mine.
Even after I finished, she kept sucking gently, cleaning me, until I was trembling and oversensitive.
When she finally pulled off, she opened her mouth slightly, showing me the last traces of my cum on her tongue before swallowing it with an audible gulp. A satisfied, almost predatory smile spread across her face.
But something was wrong.
A thin black vein pulsed under the skin of her neck for a split second, then disappeared. Her breasts looked… heavier than before. The veins beneath her pale skin were slightly darker, more noticeable. The crimson mark on her arm was glowing steadily now, like a living ember.
She stood up slowly, pressing her cum-warmed body against mine again. Her hard nipples dragged across my chest as she kissed me deeply, forcing me to taste my own semen on her tongue.
"You came so much for your first time…" she whispered against my lips, voice slightly deeper than before. "But we're not done, Ren. Not even close."
She took my still-hard cock in her hand and guided it between her thighs, rubbing the sensitive head against her soaked panties under her skirt. The heat radiating from her pussy was unreal.
"I want you inside me," she breathed, biting my lower lip. "Right now."
The wind howled through the open concrete floor as she hiked up her wet skirt and pushed her panties to the side, exposing her glistening, puffy pussy lips. She was dripping wet.
My mind was screaming that something was off — that the mark, her eyes, the veins — but the burning need in my body drowned it out.
Erico wrapped one leg around my waist, pulling me closer, aiming my cock at her entrance.
"Fuck me, Ren…"
The moment the swollen head of my cock pressed against her dripping pussy lips, a violent shudder ran through both of us. She was burning hot and soaking wet. Her juices coated my tip instantly, making the contact slick and obscene.
Erico's eyes fluttered half-closed in raw hunger. "Do it… push it in," she ordered breathlessly, her voice trembling with need.
I couldn't resist anymore.
Gripping her soft, plump ass with both hands, I thrust my hips forward. My cock spread her tight folds apart and sank inside her in one slow, deep stroke.
The sensation was overwhelming.
Her pussy was incredibly tight, hot, and velvety, squeezing around every inch as I pushed deeper. I felt her inner walls rippling and pulsing around me, greedily sucking me in until I was buried to the hilt. A low, guttural moan tore out of my throat. The pleasure was so intense my vision blurred for a second.
"Fuuuuck… Ren…" Erico moaned loudly, her head falling back. Her massive breasts jiggled heavily with the motion. "You're so deep… filling me up so good…"
She rolled her hips, grinding on my cock while her slick walls clenched rhythmically around me. The wet, squelching sounds of our joined bodies echoed across the empty fifth floor, mixing with the roar of the storm outside.
I started moving. Slowly at first, then faster, driven by pure instinct. Each thrust made her heavy tits bounce wildly between us. I couldn't stop staring at them — the way they swayed and slapped against her chest, rain mist making her skin shiny and slick. I leaned down and captured one fat nipple in my mouth, sucking hard while I fucked her harder against the concrete pillar.
Erico cried out in pleasure, her nails digging into my shoulders. Her leg tightened around my waist, pulling me even deeper with every thrust.
"Yes… just like that… fuck me harder, Ren!"
The crimson mark on my neck burned like molten metal. The same heat flared from the mark on her arm, spreading across her skin. I felt something shift.
As I pounded into her, her pussy suddenly grew hotter, almost unnaturally so. Her inner walls started rippling in strange, rhythmic waves that milked my cock with perfect, unnatural pressure. It felt too good to be real.
I looked at her face.
For a brief moment, her pupils had become vertical slits, like a cat's, before snapping back to normal. A dark vein pulsed visibly under the skin of her throat, crawling slowly upward before fading again.
I should have stopped. I should have been terrified.
Instead, the mark made me thrust even harder, slamming into her dripping cunt with wet, violent slaps. Her juices were running down my balls and thighs now.
Erico's breathing turned into feral gasps. She grabbed my face with both hands and kissed me savagely, her tongue invading my mouth as I fucked her senseless. Her massive breasts were squashed between us, nipples rubbing against my chest with every brutal thrust.
Suddenly, her pussy clenched so tightly it almost hurt. A gush of hot fluid sprayed around my cock as she came hard, her whole body shaking violently against me.
"Ahhh—! Ren… I'm cumming…!"
Her orgasm seemed to last forever. Her walls spasmed wildly, squeezing and rippling along my length. But something was wrong with the feeling. Underneath the silky softness, I felt something firmer — almost like tiny tendrils or ridges moving inside her, stroking my cock from every direction at once.
The pleasure mixed with a sharp, strange pain.
I couldn't hold back.
With a broken groan, I buried myself as deep as possible and started cumming. Thick, powerful ropes of semen erupted inside her, flooding her convulsing pussy. I kept thrusting through my orgasm, pumping load after load into her until it was overflowing, dripping out around my cock in creamy white streaks.
Erico held me tightly, moaning into my mouth as she took every drop.
For a few long seconds, we stayed locked together, panting, my cock still twitching inside her cum-filled cunt.
Then she pulled back slightly and smiled.
That smile… it stretched just a little too wide.
Her lips split further at the corners for a heartbeat, revealing rows of teeth that looked sharper than they should be. When she blinked, a second pair of smaller eyes flickered open on her temples before vanishing instantly, as if they had never existed.
The crimson mark on her arm pulsed brightly, and I felt something inside my own chest answer it — a vast, ancient hunger that wasn't mine.
"You're mine now, Ren…" she whispered, voice layered with something deeper, something that echoed like it came from far below the floor we stood on.
The rain continued pouring. Thunder rolled across the sky.
And I realized, with a mix of terror and shameful arousal, that my cock was still rock hard inside her.
Erico's pussy clenched around my spent but still-hard cock, milking the last drops of cum from me as if her body refused to let anything go to waste. She rolled her hips slowly, stirring the thick mess inside her with wet, filthy sounds.
But the changes were getting harder to ignore.
Dark, vein-like patterns were slowly spreading outward from the crimson mark on her arm, crawling across her shoulder and down toward her heavy breasts like living tattoos. Her skin seemed tighter in some places, almost stretched, while her breasts looked even larger than before — swollen, veins faintly visible beneath the pale skin, the nipples darker and leaking a thin, translucent fluid that wasn't sweat.
She noticed me staring and let out a low, distorted laugh.
"Scared yet?" she whispered, her voice echoing strangely, as if two people were speaking at once. "Don't be. This is only the beginning."
She suddenly pushed me down onto the dusty concrete floor, straddling me. My back hit the cold, rough surface as she grabbed my cock and sank back down onto it in one smooth motion, taking me balls-deep again. The new angle made her gasp, her massive tits bouncing heavily as she started riding me hard.
The wet slapping of her ass against my thighs filled the floor. Her pussy was even hotter now, almost feverish, and those strange internal ridges kept stroking me with every rise and fall. I reached up and grabbed her swinging breasts, squeezing them roughly as she fucked herself on my cock.
Thunder cracked loudly outside.
That was when I heard it.
A soft gasp. Not from Erico.
My head snapped toward the staircase. In the dim light of my phone's flashlight lying nearby, I saw her.
Our class representative — Aiko Shimizu.
She stood frozen at the edge of the fifth floor, soaked from the rain, eyes wide behind her glasses. Her neat ponytail was messy, and her uniform clung to her modest but shapely body. She had clearly seen everything: Erico riding me wildly, my cock disappearing into her cum-stuffed pussy, the glowing crimson marks, the unnatural way Erico's body was shifting.
Aiko's mouth opened and closed, but no sound came out at first. Her cheeks burned bright red, yet she couldn't look away.
Erico noticed her too. Instead of stopping, she smiled that too-wide smile again and slammed down harder on my cock, moaning louder on purpose.
"Well, well… looks like we have an audience," Erico purred, her voice thick with lust and something far darker. One of her breasts jiggled as a small, temporary bulge moved beneath the skin near her collarbone before vanishing.
Aiko took one shaky step back, but her eyes stayed glued to where our bodies were joined, watching my thick cock stretch Erico's pussy with every bounce.
"I… I saw the light from the street…" Aiko whispered hoarsely, voice trembling. "I thought someone was in trouble…"
Erico laughed softly and reached back, spreading her ass cheeks so Aiko could see even more clearly how my cock was pumping in and out of her overflowing cunt. Thick white cum was being forced out with every thrust, dripping down my balls.
"Want to join us, Class Rep?" Erico asked, her tone sweet but dangerous. "Or are you just going to stand there and watch Ren fill me up again?"
I wanted to say something — to stop this, to run — but the mark on my neck burned with unbearable heat, flooding my body with twisted pleasure and need. My hips bucked upward on their own, driving deeper into Erico as she rode me faster.
Aiko's breathing grew heavier. Her thighs pressed together under her skirt. She looked terrified… but also aroused.
Erico leaned down, pressing her leaking breasts against my chest as she whispered into my ear, loud enough for Aiko to hear:
"Two girls tonight, Ren… How does that sound?"
The storm raged on. Rain poured violently outside while inside, something ancient and hungry watched through our glowing marks.
And I realized, with a mix of horror and shameful excitement, that I wasn't going to say no.