My stepsister suddenly appeared. Born from our parents' remarriage, she is honest, cheerful, and surprisingly attached to me despite our age difference. However, her defenseless, adorable ass constantly draws my gaze. Day after day, she unconsciously flaunts her figure, and to be honest, she's exactly my type. But considering our familial relationship, I know I shouldn't act on these feelings. Still, after struggling with this inner conflict, one day I finally reach my limit...