Bored and horny, brother starts stroking his cock in his room, his mind filled with taboo thoughts. Suddenly, his sister walks in, catching him mid-stroke. Instead of leaving, she stays, her eyes locked on his throbbing member. He tries to hide it, but she's already seen enough. She moves closer, her breath hitching as she watches him stroke. He can't help but notice her hard nipples poking through her shirt. She licks her lips, her hand reaching out to touch his cock, making him shudder with desire.