I've been bullied by the delinquents in my class, and now they've even taken over my house! My older sister, who's always protected me since I was little, tried to chase them away, but instead angered them and raped me. Those guys covered my proud big-breasted sister in their semen and laughed at me. The nightmare didn't end in one day; my house became their hangout spot, and my sister was turned into their obedient sex slave... At first she resisted and desperately refused...