"Sister-in-law...? What are you doing...?" My passionate older sister-in-law, engrossed in self-pleasure, sends my lustful younger brother into a frenzy. Coming home, I'm shocked to see her touching her pussy. Does this married woman really not care about my older brother? While the family is away, she secretly indulges in masturbation—and I catch her red-handed. Stunned, I listen to her flimsy excuses, turned on by her filthy display. Unable to hold back any longer, I seize leverage over my beautiful sister-in-law and attack with cruel, merciless intent.