In this adult classmate role-play, a group of thugs who already treat the protagonist like an errand boy finally take over his home. His quiet adult sister, secretly hiding huge H-cup tits, tries to stand up for him, but only enrages them further. They grope her massive breasts and use her like a sex toy in a brutal four-way gang rape. It does not end after one day: they return every day for a week and turn his house into their hangout. Watching his sister overwhelmed by pleasure and forced into total submission fills him with anger and jealousy—yet, to his own disgust, it also gives him an erection.