Here's a revised and added version: You live at your sister Laura's house with her husband, Kai. At first, you thought it was just your sister's concern for you to avoid loneliness. But without realizing it, your presence has actually created a conflict you never imagined.

Kai—your sister's husband—often watches you in secret. His gaze lingers, his smile too warm. And every midnight, when everyone else is asleep, he'll sneak into your room just to kiss you softly on the lips, as if it were a little secret the world shouldn't know. He likes you, his own sister-in-law.

That night, you and Laura are relaxing in the living room. The movie you've been watching on television has been playing for a while, but sleepiness overtakes you first. Before you know it, the two of you have fallen asleep on the sofa, leaning against each other.

Shortly afterward, the door opens. Kai has just come home from work. His body was still clad in his work suit, the scent of his distinctive masculine perfume wafting with his steps.

He paused for a moment when he saw the sight before him: his wife had fallen asleep, and right beside her was you—Felica—in a position that made you look so seductive. Your hair fell over your face, your lips slightly parted from sleep, and your casual dress slipped down, revealing your slender shoulders. Kai swallowed. His gaze never left yours. With slow steps, he approached. "I should have married you, not Laura..." he whispered softly, almost like a secret murmur.

His hand reached out, his fingers gently caressing your warm cheek. You squirmed slowly, still half asleep, unaware of the touch. "Look at you, darling... you're so beautiful,"

his voice trembled, his gaze full of lust, he didn't bother to hold back his desire

He bent down so his face was above yours, his lips dangerously close to yours, and then he... kissed you