The heavy rain that had battered the Yuuki household for hours had finally ceased, leaving behind a silence so profound it felt like the world itself was holding its breath.
Inside Rito's room, the morning sun fought its way through the gaps in the beige curtains, casting long, hazy beams of light across the tatami mats. The room was a sanctuary of warmth and scent, musk, citrus shampoo, and the lingering electricity of a taboo finally shattered.
Rito woke slowly, his consciousness drifting back from a deep, sexual exhaustion that felt less like fatigue and more like a heavy, satisfied weight.
He felt... incredible. And also completely drained. His legs ached with a dull throb, his arms felt heavy, and his penis, though now soft, was tender and pleasantly bruised from the night's marathon.
'We... we really went all night,' Rito thought, the realization hitting him instantly. 'I didn't stop. I didn't hold back even once. All this time of extra affection towards Mikan finally led to this.'
He felt a flush of heat rise up his neck. The old him would have been screaming internally, trying to repress the memory. But the one who knew the future and accepted his own desires, just let out a shaky, honest breath. He was exhausted, yes, but he was also undeniably satisfied.
He was fully aware of the warmth pressed against his side.
He opened his eyes. Mikan was asleep in his arms.
They were tangled in the sheets, naked, their bodies sticky with the evidence of their union. Mikan's face was utterly peaceful, stripped of the "mature little sister" mask she wore so constantly. Her lips were slightly parted, her breath hitching softly against his shoulder.
Rito shifted slightly, looking down. Mikan's legs were draped possessively over his, pinning him to the mattress even in her sleep. His eyes travelled down the smooth curve of her spine, past the indentation of her waist, to her lower abdomen.
There, just below her navel, the Golden Heart Seal glowed faintly in the early morning light.
It was a perfect, gold heart, pulsing softly with an ethereal rhythm.
Rito stared at it, his heart hammering against his ribs. He felt his face turning red, but he didn't look away. He couldn't look away. It was beautiful. The sight of his sister, marked by him, bound to him... it stirred that honest, horny part of him that he usually tried to keep polite.
'It's real.' he thought, swallowing hard. 'I made her mine. I actually did it till the last step.'
He smiled, a weary, shy, but incredibly proud smile. He gently kissed the top of her head, inhaling the scent of her hair.
Mikan stirred. Her eyelashes fluttered, and her eyes opened slowly, fighting the heaviness of sleep.
She looked up at Rito, blinking away the drowsiness. Then, her gaze drifted down to their entwined bodies, realizing the lack of clothes, the closeness, the reality of the morning. Her blush was instant and explosive, racing from her neck to her forehead, turning her skin a lovely shade of pink.
But this time, it wasn't shame. It wasn't the panic of a sister caught in a compromising position. It was a sweet, possessive joy.
"G-Good morning, Rito." she whispered.
"Morning, Mikan," Rito replied. His voice cracked slightly, and he cleared his throat, his ears burning. "You... uh... you look really cute."
He mentally slapped himself. 'Cute? That's the best you can do after last night?' But it was the truth, so he said it.
Mikan sat up slightly, wincing just a little, a reminder of Rito's intensity the night before, and pushed the sheet down, fully exposing the Seal. She stared at it, her eyes widening.
Tears welled up in her eyes, not tears of sadness, but of sheer relief and triumph.
"It's real," she whispered, her voice trembling as she traced the heart with a shaking finger. "I can't believe it. I thought... I thought I was going to be the only one who didn't get one. I thought I would just be the sister who watches you marry everyone else."
She looked at him, her eyes bright with victory, the tears spilling over.
"But now... now I'm just as close to you as Lala-san, Run-san and Haruna-san," she said, a wobble in her voice. "I'm your wife now too, Onii-chan! I'm Wife Number Four! I'm really part of the family!"
Rito felt a pang in his chest. Seeing her so happy to be "Number Four" made him ache.
He pulled her close, resting his chin on her head, his face still flushed but his expression serious. He knew he had to say this. He had to be honest about how much he wanted her, even if it was embarrassing to say out loud.
"Mikan," Rito said softly, his voice firm and loving, though his cheeks were bright red. "Look at me."
He pulled back, his gaze locking onto hers.
"You're not just Wife Number Four," Rito corrected her. His voice held the gravity of his 'King' status, the confidence of his future knowledge, even if his shy demeanor made him stutter slightly on the intake of breath.
Mikan blinked, confusion clouding her teary eyes. "E-Eh? But the seal..."
"The others are my wives." Rito said, his honest eyes burning into hers. "Lala, Haruna, Run... they're amazing, and I love them, and they have the Seal. They are my partners."
He moved his hand down, gently kissing the new golden mark on her stomach, feeling the warmth of the magic against his lips. Mikan shivered, her hands gripping his shoulders.
"But you," Rito whispered, pulling back up to bring his face inches from hers. He was blushing furiously now, steam practically rising from his head, but he forced the words out because they were the absolute truth.
"You are my Little Sister."
Mikan's breath hitched. "Rito...?"
"That is a role only you can have," Rito said, swallowing his embarrassment to deliver the vow. "It means you're the foundation of my life. It means you're the keeper of my home. No matter how many wives I have, no matter how big the harem gets... you are the one who grounds me."
He cupped her face in both hands, his thumbs brushing away her tears.
"It means you're closer than any wife, Mikan."
He kissed her deeply, a long, soft kiss of eternal promise. It was sweet, but Rito poured all his desire into it, letting her feel exactly how much he needed her.
When they broke apart, Rito rested his forehead against hers, panting slightly.
"You are the sister I love, and the wife I possess," he whispered, his voice trembling with the weight of the confession. "That status is exclusive. It is forever. You are my most important Seal."
Mikan's eyes welled up again, but the insecurity that had plagued her for so long, the fear of being "just the sister", shattered completely.
She clung to him, burying her face in his chest, her nails digging into his back.
"Onii-chan..." she sobbed, happily, her voice muffled against his skin.
She had won. Not just a spot, but the best spot. The one no one else could ever take.
Rito held her tight, his heart racing a mile a minute, his face still burning. He was a blushing mess, but he didn't take back a single word. He was a pervert, and he was her brother, and he was her husband. And he was okay with that.
*****
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