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[Sasaki's Apartment Building — Hallway Sayuri's Unit]
Sayuri stood in the corridor long after the girl had vanished down the stairwell, her bare feet cold against the concrete, arms folded beneath the oversized cardigan she'd thrown on in a hurry. The fluorescent hall light buzzed overhead with that particular frequency that always made her temples ache.
She stared at the place where the girl's back had been — slim shoulders, a certain stiffness in her gait, the faint residual scent of Sasaki's laundry detergent clinging to clothes two sizes too large — and something tightened in Mitsuki's chest that she couldn't name.
She looked like she was about to cry. Or scream. Or both.
The door to her own apartment was still ajar. Sayuri stepped inside, locked it behind her with the chain latch, and exhaled.
Ichinose Tanaka sat on the beige sofa in the living room — legs spread wide, one arm draped over the backrest, a can of Asahi sweating onto the glass coffee table without a coaster. The television was on but muted, some weekend variety show flashing bright colors nobody was watching. The apartment smelled like his cologne, sharp and synthetic, layered over the stale ghost of last night's convenience-store yakisoba.
He looked up when she entered. "Sasaki-kun's still not awake?"
Sayuri kept her expression flat. "The girl he likes came to see him. I didn't want to intrude."
That's the truth. Just not the whole truth.
Ichinose Tanaka's eyebrows rose, then fell. He let out a long, theatrical sigh and leaned back deeper into the cushion.
"Shame. Guess you can't head over there for now." He rubbed his jaw, the rasp of stubble audible in the quiet room. "Don't worry about it. With your looks, no guy holds out forever. Give it time."
Sayuri said nothing. She stood near the kitchen counter, fingers curled around the edge of the laminate, and watched him the way someone watches a roach deciding which direction to crawl.
Ichinose Tanaka stood, patting down the pockets of his slacks — wallet, phone, keys. His movements had that particular briskness of a man late for something he was excited about. "I'm heading out. Meeting someone." He didn't elaborate. He never did when it was another woman. "If you get a chance today, go build some rapport with Sasaki-kun, yeah?"
Build rapport. Like I'm networking at a corporate mixer. Like he's a client I'm supposed to close.
She nodded once.
He left without kissing her goodbye — not that she wanted him to. The door clicked shut, and the apartment settled into the specific silence of being alone: the refrigerator humming, a car horn somewhere distant, the muffled thrum of a washing machine through the wall.
Sayuri walked to her bedroom and shut the door.
It was small — barely ten tatami mats — but it was hers. She'd negotiated hard for the private bathroom when they'd moved in together, and that tiny en-suite with its narrow shower stall and frosted-glass door was the single concession that made this arrangement survivable. The room smelled like her own shampoo, yuzu and white tea, and the stack of paperbacks on the nightstand, and the faintly dusty warmth of afternoon sunlight through curtains she hadn't opened yet.
She sat on the edge of the bed, mattress dipping under her weight, and pressed her palms flat against her thighs.
The girl's face surfaced again in her memory. Young — high school, definitely. Pretty in that unfinished way, all soft edges and wide eyes, wearing Sasaki's sweat like a suit of armor that didn't quite fit. Running out of his apartment on a Saturday morning. The implications wrote themselves in bold.
If those two are already together — if they've confessed to each other — then what am I doing?
The arrangement with Sasaki was supposed to be simple. Pretend to be close. Make Ichinose Tanaka believe she had someone else interested. A performance, nothing more. But performances required scenes, and scenes required proximity — his hand on her waist when Ichinose Tanaka was watching, the suggestion of intimacy in how they spoke, all those small fabricated touches that meant nothing but looked like everything.
If that girl found out, she'd be devastated. Or furious. Or she'd leave Sasaki entirely, and it would be Sayuri's fault.
I'm dragging him into my mess the same way Ichinose Tanaka dragged me into his.
Sayuri lay back against the pillow, staring at the ceiling where a hairline crack ran from the light fixture to the corner. The guilt sat heavy and sour at the base of her throat, like bile she couldn't quite swallow.
Was it worth it? Risking someone else's happiness — Sasaki's happiness, and that girl's — for her own escape?
She didn't have an answer. The crack on the ceiling offered nothing.
---
[Sasaki's Apartment — Kitchen Living Room, Saturday Morning–Evening]
Sasaki finished eating and stood over the sink, running hot water over the dishes. Steam rose and fogged the small window above the faucet. He scrubbed the plates methodically — soap, sponge, rinse, rack — his movements efficient and unhurried, the kind of domestic routine that required no thought and left the mind free to wander.
She'd left.
He'd let her leave. Pushing too hard too fast snapped the leash entirely, and a snapped leash meant starting from zero. The correct rhythm was pressure, then release. Tension, then slack. Like training a stray to eat from your hand — you didn't grab; you set the food down and walked away.
The marks will handle the rest. All I have to do is wait.
He dried his hands on the dish towel, draped it over the oven handle, and dropped onto the sofa. The cushion still held a faint impression of Ruri's body heat, though it was cooling fast. The living room smelled like the breakfast he'd cooked — sesame oil, miso broth, the caramelized edge of slightly burnt egg — and beneath that, the lingering ghost of her: cheap strawberry conditioner and something cleaner, like freshly laundered cotton.
He opened the System interface in his mind and reviewed the Scumbag Points balance. Still climbing, but not fast enough. The Exchange Shop refreshed its inventory on a cycle he hadn't fully mapped yet, and some of the higher-tier items had vanishing windows. He needed to farm efficiently.
Three targets currently in play.
Ruri — just departed. The Lust Marker signatures on her inner thigh and lower abdomen were time-release investments; the effects would compound over hours, building incrementally, each wave a little stronger than the last. Pushing her again today would be counterproductive. Let the ink do its work. Let her lie in bed tonight and wonder why her skin wouldn't stop tingling. Let confusion ripen into need.
Mitsuki — Egawa Mitsuki, the heiress. Three remaining uses on the Lust Marker, and she was the ideal candidate. Since the incident in the principal's office, she'd gone radio-silent — no messages, no eye contact in the halls, nothing. That silence could mean she was processing, or it could mean she was building a case. Her family's reach made her dangerous in a way Ruri never could be. A signature on her skin would add another layer of control, another tether.
But reaching her on a weekend was functionally impossible. Mitsuki had never once accepted a social invitation from classmates — not the karaoke outings, not the shopping trips to Shibuya 109, not even the group study sessions before midterms. She declined every time with the same polished excuse: supplementary lessons.
Sasaki had initially read that as standoffishness.
Now, knowing her background — old money, corporate dynasty, the kind of family that treated education like an Olympic sport — he understood it was simply the truth. Her weekends were scheduled down to the quarter-hour. Piano. English tutoring. Etiquette. Calligraphy, probably. Her phone might not even be in her own possession until Monday morning.
Messaging her now would be painting a target on my own back. Her parents see an unknown number from a male classmate on a Saturday night and I'm finished before the semester ends.
He discarded the idea.
That left Sayuri. But approaching Sayuri contradicted the character he'd built — the quiet, earnest neighbor with an unrequited crush, too shy to initiate, too decent to impose. If he knocked on her door, the persona cracked. She had to come to him. And she would, eventually. Her fiancé's fetish guaranteed it; Ichinose Tanaka would keep pushing her toward other men, and Sasaki was the most convenient option within arm's reach.
Patience.
Sasaki unlocked his phone, opened a manga reader app, and started scrolling through the latest chapter of Oshi no Ko. The afternoon dissolved in increments — one chapter became five, five became twelve. Sunlight shifted across the living room floor, golden to amber to the blue-grey of early evening. He ordered delivery around seven — tonkotsu ramen from the place two blocks over, extra chashu — and ate it on the sofa with the TV playing a rerun of some Gintama episode he'd seen three times.
Sayuri never came.
Probably working. Black-company hours. It's not unusual.
He set the empty container on the coffee table, stretched until his spine popped, and resumed scrolling.
Night settled over the apartment like a slow exhalation.
---
[Sato Residence — Bathroom Ruri's Bedroom, Saturday Night, 10:14 PM]
Ruri had spent the afternoon and evening with friends — window shopping in Harajuku, splitting a crêpe outside the station, sitting in a booth at Jonathan's family restaurant for three hours nursing iced teas and talking about nothing. She'd laughed more than she had in days. The distraction worked so well that she'd forgotten entirely about the ink on her skin, the way you forget a bruise until something presses against it.
Home by eight. Dinner with her mother — grilled mackerel, pickled radish, rice, the comfortable monotony of a weeknight meal. Then her mother's voice, firm and affectionate, cutting through her post-dinner drowsiness: "Homework, Ruri. Now."
She'd sat at her desk for two hours, grinding through math problems and English vocabulary with the grim determination of someone defusing a bomb. By ten o'clock her wrist ached and her eyes burned, and the last problem set lay completed in her notebook, handwriting deteriorating from neat to barely legible across the page.
She stood, gathered her pajamas and a towel, and padded to the bathroom.
The overhead light was harsh — that unforgiving fluorescent white that made every imperfection visible. She turned on the shower, letting the water heat while steam began to curl against the mirror. The bathroom was small, tiled in pale green, smelling of her mother's lavender cleaning spray and the mineral tang of hot water from old pipes.
Ruri peeled off her shirt. Unclasped her bra, the elastic leaving faint pink lines across her shoulders and ribs. Stepped out of her jeans and underwear, the denim pooling around her ankles.
She stood in front of the fogging mirror and looked down at herself.
The signature on her inner thigh was still there — Sasaki's name, written in that infuriatingly confident hand, the ink dark against the pale, soft skin of her upper leg. She'd known about that one. She'd been furious about that one.
But the second signature — the one low on her abdomen, just above the waistband line where her underwear usually sat, angled slightly toward her left hip — she had not known about.
Her breath caught.
When did he—
The memory unspooled before she could stop it: Sasaki kneeling beside her on the sofa, one hand warm and heavy on her thigh, kneading the muscle with a slow, deliberate rhythm that had turned her brain to static. His other hand reaching for her jeans. The quiet metallic whisper of the zipper lowering. Cool air against the flat plane of her lower belly. The felt-tip of the marker, precise and unhurried, tracing characters into her skin while she'd been too far gone — too drunk on the sensation of his fingers working her thigh — to notice or protest.
He did it while I was... while I couldn't think straight. That perverted, manipulative—
"Pervert," she hissed aloud, the word bouncing off tile.
Her cheeks burned scarlet. She pressed her hand flat against her lower belly, covering the signature as if she could will it away through sheer embarrassment. The ink sat just four fingers' width above her mound, close enough that looking at it made her stomach flip in a way she refused to examine.
She stepped under the shower spray.
The water was hot — almost too hot, the way she liked it, reddening her shoulders and chest on contact. Steam thickened the air, carrying the scent of her body wash as she squeezed a generous amount into her palm. Coconut and vanilla. She lathered her arms, her collarbones, her breasts — quick, perfunctory — then brought both sudsy hands down to her abdomen.
She pressed her palm flat against the signature and scrubbed.
"Nnh—!"
The sound ripped out of her before she could catch it — a sharp, involuntary gasp that she bit down on a half-second too late. Her hand froze against her belly. The sensation was immediate, violent, electric — as if every nerve ending beneath the ink had been stripped raw and rewired directly to the base of her spine. A current shot downward, hot and liquid, pooling between her thighs with a specificity that made her knees soften.
She stared down at her hand, water streaming over her wrist, suds sliding in slow rivulets down the flat, taut skin of her stomach.
What the hell was that?
Tentatively — jaw clenched, breath held — she rubbed again. Lighter this time. Just her fingertips, circling the edge of the signature.
"Hhah— mmn—!"
Worse. Stronger. The electricity branched outward from the ink like lightning finding ground, crackling up through her ribs and down into her pelvis, a deep, throbbing pulse that synced with her heartbeat. Her thighs pressed together involuntarily, the slick of soap and water making the friction smooth and obscene. Goosebumps erupted across her arms despite the heat. Her nipples tightened to stiff, aching points, the shower spray suddenly unbearable against them.
She scrubbed harder — defiant, desperate to erase his name — and the third stroke broke something open.
"A-aahhn... nnn, hahh—!"
Her voice cracked into a moan she didn't recognize as her own. The sensation was a white-hot wire dragged slowly across the inside of her skin, every centimeter of the signature radiating a pulsing, maddening warmth that made her hips jerk forward involuntarily. Her hand was shaking. The lather slid down her belly in a slow, foamy trail, catching in the crease of her thigh, and even that — that incidental, meaningless contact — sent a spike of pleasure sharp enough to make her vision blur.
"Ngh— s-stop, why is it—"
She yanked her hand away and stumbled back against the tiled wall, the cold surface shocking against her shoulder blades. Water cascaded over her flushed body — down her heaving chest, between her breasts, splitting into streams over the quivering plane of her stomach. She could see the signature still there, the ink stubbornly dark, completely undiminished despite the soap. His name. Right above her—
It's the same. The same as when he was touching my leg. My body is reacting the same way it did when he—
"My body's too sensitive," she whispered, voice thin and horrified in the steam. "What's happening to me?"
Is it because the signature is so close to... to there?
The thought alone made heat surge up her neck. She couldn't look at her own reflection in the fogged mirror. Couldn't look down at the ink. She finished the rest of her shower in a frantic rush — hair, back, legs, all of it mechanical and hurried, hands deliberately avoiding both signatures as if they were open wounds. The one on her inner thigh throbbed with a low, persistent warmth she'd been ignoring all day, but now, sensitized from the abdomen, even that muted pulse felt amplified, a second heartbeat in the wrong place.
She toweled off roughly, pulled on her pajamas — a loose cotton tee and drawstring sleep shorts — without looking in the mirror, and fled to her bedroom.
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[Sato Residence — Ruri's Bedroom, Saturday Night, 10:52 PM]
The room was dark except for the blue-white glow of her phone charging on the nightstand. Ruri crawled under the duvet, pulled it up to her chin, and squeezed her eyes shut.
Sleep. Just sleep. Tomorrow it'll be fine. Tomorrow my body will be normal again and I'll forget about all of it.
But her brain refused to power down.
Behind her closed eyelids, the scene replayed on a loop she couldn't pause — Sasaki's hand on her thigh, the heat of his palm through denim, the slow, rolling pressure of his thumb finding the knot in her muscle and grinding it loose with a patience that bordered on cruelty. The way her breath had stuttered. The way her spine had arched off the sofa without her permission. The low, amused certainty in his voice when he'd told her to relax, as if he knew exactly what he was doing to her, as if her body was an instrument and he already had the sheet music memorized.
The signatures pulsed.
Both of them — thigh and abdomen — synchronized now, a slow, rhythmic throb that matched her heartbeat but felt deeper, warmer, like something glowing beneath the surface of her skin. The sensation radiated outward in concentric waves, each one reaching a little further than the last. The inner thigh signature sent warmth crawling upward, and the abdominal one sent it downward, and the two fields overlapped somewhere in the middle with a convergence that made her squeeze her thighs together under the sheets and bite the inside of her cheek.
Don't think about it. Don't think about it. Don't—
She thought about it.
His hands. The specific width of his fingers. The calluses she'd felt against her skin — rough, slightly dry, catching on the soft inside of her thigh in a way that made the touch feel more deliberate than it had any right to be. The ink drying on her belly, cool and precise, while his other hand kept kneading, kept pulling sounds out of her that she'd never made before and never wanted to make again.
The itch was unbearable now.
Not a surface itch — not something she could scratch. It sat beneath the skin, nested in the tissue itself, a restless, squirming heat that radiated from both signatures and pooled in the space between them. Her lower belly felt swollen and tight, her inner thighs tingling with a sensitivity so acute that even the cotton of her shorts, shifting against her skin as she squirmed, registered as a slow, dragging caress.
This is his fault. This is — I don't — why won't it stop—
Ruri rolled onto her side, hugged the pillow to her chest, pressed her thighs together hard. The pressure only made it worse — a low, aching throb answering back, deep enough that she felt it in her teeth.
She lasted four minutes.
Her hand moved before the decision was fully conscious — slipping down from the pillow, past the hem of her sleep shirt, settling against the waistband of her shorts. She turned the hand over, pressing the back of her knuckles against her lower abdomen, right where the signature sat beneath the fabric.
"Mmn..."
The sound was barely there — a soft, shuddering exhale into the pillow. The contact, even through cloth, even with just the backs of her fingers, lit up the signature like a struck match. Warmth flooded downward in a heavy, liquid rush, settling between her legs with an insistence that made her hips roll forward of their own accord, seeking pressure that wasn't there. Her toes curled against the mattress. Her breathing went shallow and quick, each inhale catching in her throat like a small, swallowed sound trying to escape.
She pressed harder, knuckles grinding slow against the fabric, and her back arched off the bed in a trembling, involuntary curve.
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