Suddenly, the door burst open. Koo’s bedroom flooded with harsh light—and two stunned faces. Hana stood frozen, her mouth slack, her fingers clutching Taehyung’s arm. “What—?” Her voice cracked, her face paling as she took in the scene—her sister sprawled naked, thighs slick, lips swollen, her hair tangled with sweat. And beneath her—her father-in-law, his cock still twitching inside Koo’s ass, his hands gripping her hips possessively.

Taehyung’s fists clenched, his jaw tight. His eyes burned with fury—not just at Koo, but at his own father. “You— fuck—” His voice was a growl, low and dangerous.