The door clicked open in the late afternoon, breaking the serene silence of the house.
"Hellooo? I'm back!" Rina's playful voice echoed through the entryway.
Aya, still flushed from the intense morning session, peeked out from the kitchen, hair damp and tied in a loose bun. She had changed into a long dress to hide any signs of what had transpired just hours earlier.
"Rina! That was fast," she smiled, walking up to hug her younger sister.
Rina grinned. "Classes got cancelled, and I was too bored in the dorm. Besides, I missed this house."
Behind her, Rikuto emerged from the hallway, freshly showered, wearing a black tee and lounge pants.
When Rina's eyes met his, something subtle flickered across her face.
Confidence.
Amusement.
And just a bit of heat.
"Oh, brother-in-law~" she cooed, stepping past Aya and casually brushing her arm against his as she walked by. "Did you miss me?"
Her scent hit him first — fruity, with a hint of something warmer, deeper. She wasn't the awkward, shy college girl he remembered. There was a dangerous playfulness now in her curves, in the way her hips swayed with every step, and in how her crop-top lifted just enough to show her creamy lower back.
He kept his voice calm. "It's been a while, Rina."
She turned her head and smiled at him over her shoulder. "I grew up a little. You'll see."
Aya rolled her eyes. "Ignore her. She's just trying to show off."
Rina giggled. "Well, you both do look... refreshed." Her gaze lingered a little too long on Rikuto.
---
Later That Night
The guest room lights were on, and Rikuto passed by the slightly ajar door. From the corner of his eye, he noticed Rina inside, changing.
He froze.
Her back was facing him, but the reflection in the vanity mirror betrayed everything.
She stood in just her panties and a barely-there bra, arms lifted as she adjusted her hair. Her figure was more mature than he remembered — smooth skin, firm curves, and a toned waist that begged to be touched.
Rikuto's breath hitched.
He started to turn away—
But then she looked into the mirror.
Locked eyes.
And smiled.
As if she knew.
She didn't cover herself. She simply turned slightly, giving him a teasing glimpse of side-boob, then pretended not to notice his stare as she hummed a tune and slowly bent down to pick up her shorts — giving him an unreal view of her round, firm rear barely covered by the thin fabric.
Ding!
> System Notification:
"Temptation Triggered: Forbidden Curiosity"
Target: Rina Hoshino
Mood: Playful | Guard: Low | Desire: Latent
'This one is a slow flame. Feed her attention, and she'll burn just for you.'
New Quest Available: "Fan the Embers"
Objective: Flirt subtly, cause her heart to skip. Rewards scale based on her reaction.
Rikuto clenched his jaw and walked away before temptation claimed him right there.
But the seed was already planted.
---
Next Morning,
At breakfast, Rina wore a tight tank and shorts too small to be casual. Her bare legs brushed Rikuto's under the table. Accidentally.
Or maybe not.
"Morning, brother-in-law," she whispered, licking syrup from her finger as she sat across from him.
Aya was busy with her phone, completely unaware.
Rina's gaze didn't break.
She bit her lip and smiled faintly.
Something between them had shifted.
And it was only beginning.