Makoto shrugged as he led them into a crepe shop. The shop was bright and cheerful, smelling overwhelmingly of sugar and burnt batter. It was a completely inappropriate setting for this conversation.
"Come on, I was just a horny young guy with no girlfriend back then. A little fantasy wouldn't hurt, right?" He murmured as he looked at the menu at the counter.
He turned to Yuna, eyes sparkling. "It was something like... you walking into my room while I'm jerking off and offering to help. Or you got a boyfriend and asked me to teach you how to do it properly." He sighed. "Too bad none of that ever happened, though."
Yuna stared at him, her face blank. She was processing, her brain visibly buffering, that she forgot to order her crepe. Mika stepped up to the counter. "I'll have the strawberry cheesecake crepe, please," she said to the cashier, calm as ever, while Yuna's brain was clearly about to short-circuit.
Then, Yuna finally rebooted, and she snatched the menu from the counter. "I'll have the banana and chocolate one, with extra whipped cream," she declared to the cashier.
As they settled at a table in the corner of the shop with the freshly-made crepes, Yuna turned back to Makoto. A slow, delighted smile spread across her face. "Too bad?" she repeated. "Big bro... who said it was too late?"
She leaned in close, her voice dropping to a whisper that Mika could definitely still hear. "You know, I've been thinking about getting a boyfriend. A fake one, of course." Her gaze dropped to his lips, then back up. "And I'm going to need a very good teacher to teach me... everything."
Makoto grinned. "Oh, so you want to play the innocent stepsister asking her brother how to fuck her boyfriend properly? I can handle that. How about you? Do you have any crushes? Or did you have any fantasies about me back then?" He pinched her cheek.
Yuna slapped his hand away, though not hard. Her face flushed crimson. "Don't be stupid," she muttered, avoiding his eyes. She fidgeted with her bag strap, uncharacteristically nervous.
Mika smiled as she took a bite of her crepe. "You should tell him, Yuna. It's only fair."
Yuna shot her a murderous look. Then she took a deep breath. "Fine," she said quietly. She stared at her crepe like it held the secrets of the universe. "There was one."
She took a vicious bite, chewing with furious intensity. "It was when you got your first girlfriend. In high school." She glared at him, old jealousy flickering in her eyes. "She was a bitch. And she had flat tits."
"And I used to imagine that you'd come home from a date with her, all frustrated and disappointed. And I'd be waiting in your room, wearing your favorite t-shirt and nothing else." She looked up, her eyes wet. "And I'd show you what a real woman could do."
Makoto sighed. "Well, we broke up because that bitch cheated on me." He looked at Yuna fondly. "But knowing my little stepsister could get jealous like that is... assuring."
Yuna's head snapped up. "She WHAT?! That flat-chested, two-timing SKANK!" She slammed her fist on the table, making the crepes jump. "Where does she live? I'm going to go over there right now and—"
"Not sure, I don't keep her contact." Makoto just shook his head and winked at Mika. "That crepe looks delicious, Mika. You should feed me."
Mika smoothly intervened. She picked up a perfect, cream-laden bite of her strawberry cheesecake crepe and held it out to him, cutting off Yuna's tirade. "Of course, Makoto-kun," she said softly.
Her eyes locked on Yuna, a silent message passing between them. She fed him the bite, her fingers brushing his lips.
Yuna's rant sputtered to a halt. She watched their intimate exchange, her expression a chaos of conflicting emotions. The rage was still there, simmering. But she let out a long breath, and it seemed to drain out of her.
"...Good," she muttered. "That bitch didn't deserve you anyway."
She took another angry bite of her crepe. "You deserve someone better." Her eyes flickered to Mika, then back to her plate. "...Someone who appreciates your fat, disgusting, perverted... cock."
Makoto rubbed Yuna's head and ran his hands through her hair. "I know, that's why I love you the most, little sis."
He turned to Mika. "Hmm, that's enough about us. How about you, Mika? Have you ever had any lewd fantasies you can't tell anyone?"
Mika froze, her spoon hovering halfway to her mouth. A slow blush crept up her neck. She looked from his eager face to Yuna's suddenly very interested one. Then she took a deep breath.
"Well," she began hesitantly. "There is one." She set her spoon down with a soft click. "It's a little silly. And a little... specific." She looked at him, eyes wide and pleading. "You two are going to think I'm a freak."
Yuna leaned forward. "Oh, we already know you're a freak, miss good girl," she said. "You can just tell us the details."
Makoto giggled and leaned in, biting Mika's cheek. "Yeah, no sane person would mingle with us and be fine with all of that." He looked into her eyes. "You can tell me. I won't judge. But maybe Yuna will."
Mika let out a small gasp as he bit her cheek, shivering. But she didn't pull away. Instead, she leaned into the touch, a small smile on her face.
Yuna scoffed. "Of course I'll judge. But I won't tell anyone. Probably."
Mika took another deep breath. "Okay," she said quietly. "It's about cosplay. I got it after our... cosplay project last week."
She looked at Makoto, eyes wide with shame and excitement. "I imagine we're at a con. And I'm in a really cute, really popular costume. Something like Nezuko from Demon Slayer. Everyone's taking my picture, and I'm smiling and posing and being the perfect, innocent little character."
"And then you come up to me. And you're looking at me with that... that hungry look in your eyes." She took a breath. "And you don't say anything. You just take my hand. And you lead me away from the crowd to a quiet place. Like the back of a panel room, or an empty stairwell."
Makoto winked. "Hmm, that's so kinky. Seems like our last cosplay session triggered something. And then... what's next?"
Mika's cheeks were on fire, but her eyes were shining. She was lost in the fantasy now, the words tumbling out breathlessly. "And then you push me up against the wall. And you don't say anything. You just... you just look at me."
Yuna had completely stopped eating. She was leaning forward, chin in her hands, utterly captivated.
"And then you start to undress me. Slowly, piece by piece. You take off the haori, and the kimono, and the obi... but you leave the bamboo muzzle." Her entire body trembled. "And then you fuck me. Right there, in the middle of the con. And I can't even scream, because of the muzzle."
She looked up, her eyes wet. "And the whole time, you're telling me how much you love your little stepsister." She glanced at Yuna. "And how I'm just a cheap, pathetic substitute."
Makoto gulped, his cock hardened just from hearing her. "Damn, that was... hot, indeed." He looked at them both. "We can arrange that next time. But you'll have to be prepared to be teased to death by Yuna."
Yuna, who had been listening with rapt intensity, finally spoke. "No."
Mika's face fell, with genuine disappointment in her eyes. "That's not hot," Yuna continued. "That's pathetic."
She looked at Mika. "You want to be a substitute? A cheap stand-in for me?" She shook her head. "That's not how this works." She leaned across the table. "You're not my substitute, Mika. You're the second wife."
She turned to him. "Next time, we're all going to the con together." She looked at Mika, a predatory grin spreading across her face. "And you can be Nezuko, and I'll be Shinobu Kocho. The one who likes to discipline naughty demons."
She winked. "Then he can be our horny photographer, or something else."