Yuna grabbed the clothes, yanking on her hoodie. "Duh! Of course. You think I can live on your cum alone?"
She hopped into her jeans without any underwear, giving him a quick flash, and stuffed the ruined Ganyu costume into a plastic bag like it was a murder weapon.
"And we're going somewhere expensive!" She linked her arm with his, skipping toward the elevator. "I want wagyu! And sushi! And..."
She stopped dead, her eyes wide with fake shock. "Oh my god. Is this... a date? After you creampied your little stepsister TWICE?"
Her grin turned positively demonic as the elevator doors dinged open. Makoto wanted the floor to swallow him whole.
He tried to make a beeline for the exit, but Yuna had other plans. She dragged him toward the reception desk, where a stone-faced woman was pretending not to notice them.
"Thank you so much!" Yuna chirped at the receptionist, her voice dripping with fake innocence. "The room was perfect for our... movie session! We got so much bonding done."
She gave Makoto's cheek a loud, wet kiss. The receptionist's eyebrow twitched. Makoto felt his soul trying to leave his body.
He practically dragged her out onto the street. "What the hell was that for?!" he hissed.
"Just being a grateful customer!" she sang, swinging their linked arms. "Besides, we need to keep up our cover story. We're just a brother and sister, having a nice day out after our movie!"
She leaned in close, her whisper hot and conspiratorial. "A very... interactive movie."
He spotted a fancy Japanese buffet restaurant across the street.
"There," he grunted, pulling her toward it. "You can eat whatever you want, just promise me you'll shut up."
"Oh, I'll shut up," she purred, "as soon as my mouth is full of wagyu. And maybe something else later." She gave a dazzling smile to the hostess who greeted them.
"Table for two, please! My big brother is treating me after a very long and tiring activity. I'm starving!"
The hostess led them to a table, blissfully unaware of the double meaning. Makoto felt like he'd just run a marathon.
"It wasn't my stepsister that I fucked," he grumbled as they walked to their seats together. "It was Ganyu."
Yuna just cackled. "Suuure it was Ganyu," she sang, immediately piling a plate high with wagyu and sashimi. "That's why big bro's face is redder than this tuna sashimi!"
She skipped over to the dessert section and started loading another plate, announcing loudly to anyone nearby,
"Ganyu worked up a huge appetite getting creampied twice! She needs some carbs to get her energy back!"
Several people stared, their faces a mix of horror and confusion. Yuna just winked and popped a strawberry into her mouth with an obscene slurp.
"So..." she purred, leaning across the table so her hoodie gaped open again. "When are we doing the Nahida roleplay?"
"Can you keep your voice down, please??" Makoto hissed, stealing a piece of wagyu from her plate to shut her up.
"I'm broke until my next payday." He turned away, staring at the wall. "Not that I'm looking forward to it or anything."
"Aww, poor big bro," Yuna cooed, but her eyes softened just a little. She slid half her wagyu onto his plate. "Here. Can't have my favorite whale going hungry."
She leaned back, twirling her chopsticks. "You know," her voice dropped to a whisper, "I could give you a sibling discount. Half price for Nahida."
Suddenly, she smirked wickedly. "But only if you admit you had fun tonight. With me. Not just Ganyu."
She poked his cheek with a chopstick. "Come on, say it! Say 'Yuna, my little stepsister, gave me the best fuck of my life!'"
"Fine, fine," he finally grunted, shoving a piece of beef into his mouth to hide his burning face. "It was good. Because it was with you. Happy?"
Yuna's face lit up like a Christmas tree. "YES! I KNEW IT!" she shouted, pumping her fist in the air before remembering where they were and ducking down.
She leaned across the table and stole a piece of his sushi. "So does this mean..." her voice dropped to a conspiratorial whisper, "...we're gonna do this again? Like, regularly?"
Her foot found his under the table. "Because I was thinking... maybe we don't need the costumes every time?"
She bit her lip, looking uncharacteristically shy. "I mean... if you like me for me and all that..."
"Ugh, no, that's gross," he grunted, the idea too raw, too real.
He stuffed another piece of wagyu in her mouth. "It would feel too weird. Doing that stuff with my actual stepsister."
Yuna choked on the wagyu, her eyes watering. "Liar!" she gasped, pointing her chopsticks at him. "You literally just said—"
She suddenly grinned, leaning back. "Fine, fine. I get it."
Her voice took on a teasing lilt. "Big bro needs my precious costumes to pretend he's not railing his little stepsister."
She popped another piece of sushi in her mouth, chewing thoughtfully. The gears in her head were turning.
"Lucky for you," she said, her eyes glinting, "I've got my eye on this super cute Klee costume..."
She let the name hang in the air. "Think you can handle a pyromaniac loli calling you 'big brother' while you—"
"I'm not a lolicon, okay?" Makoto yelled, the words exploding out of him.
He winced, realizing he'd just shouted in the middle of a crowded restaurant. Several heads turned their way.
He lowered his voice, avoiding her knowing gaze. "They just… look cute. They remind me of you. Back when you were little."
The moment the words left his mouth, he knew he'd screwed up.
Yuna's chopsticks clattered onto her plate. Her eyes, which had been sparkling with mischief, went wide with a dawning, unholy delight.
It was the look of someone who'd just struck gold.
"Oh. My. God," she breathed, the words slow and deliberate. "Big bro… you're into me? Like… childhood me?"
She leaned so far across the table that her hoodie almost dipped into the dessert plate. "Is that why you want the loli cosplays?"
Her voice dropped to a scandalized whisper that somehow carried across three tables. "You want to fuck the young, innocent Yuna?!"
Before Makoto could even think of a denial, she bounced in her seat with a glee that was both terrifying and infectious.
"THIS IS GOLD! Okay, new package deal: 300,000 yen gets you the Klee cosplay AND..." She dropped her voice to a creepy, chillingly accurate childlike whisper.
"...I'll call you big bro the whole time."
Makoto almost choked on his drink. The lukewarm water went down the wrong pipe, and he coughed violently, his eyes watering.
He could feel the stares of the nearby tables burning into him.
They'd heard. Of course, they'd heard.
"She's insane," he thought, a wave of pure panic washing over him. "She's actually saying this in a public restaurant. People are going to call the police. My life is over."
He leaned in close, his voice a desperate, strangled hiss. "Geez, stop talking, will you? People will think I'm a pervert if they hear that."
His own words sounded pathetic, a confession of guilt. He was already lost.
"Make it 100,000 yen," he whispered, the number a desperate prayer. "And give me like, half a month, maybe?"
Yuna's eyes sparkled with absolute victory.
She leaned in, her whisper a triumphant counterpoint to his. Her chopsticks tapped his nose like a judge's gavel.
"Deal!" she chirped. "But you're paying interest. Ten percent for every day you're late."
With the contract sealed, she suddenly stood up and stretched dramatically.
Her hoodie rode up, showing off the distinct, purplish hickies he'd left on her stomach earlier.
"Now, if you'll excuse me," she announced, her voice ringing out loud and clear enough for the horrified couple three tables over to hear perfectly.
"I need to go put on my panties after that intense sibling bonding session."
Makoto froze, his blood turning to ice. He wanted the floor to open up and swallow him whole, again.
He could feel every single stare in the restaurant on him, a silent, damning judgment.
"She must be a demon, no, a succubus," he thought, a strange mix of horror and twisted admiration filling his soul. "A beautiful, brilliant succubus sent from hell to ruin my life."
As the horrified diners stared, their chopsticks paused mid-air, Yuna skipped gleefully toward the restroom.
She called back over her shoulder, her voice a sickeningly sweet promise of the depravity to come. "Don't worry, big bro! I'll be your Klee soon enough!"
Just before she disappeared around the corner, she pumped a small fist in the air.
Her final word echoed through the stunned silence of the restaurant, a chilling, cheerful battle cry.
"Boom boom bakudan!"