The series 'Gakuen Shimai' dives deep into the forbidden incestuous desires between step-siblings Shuichi, Fubuki, and Fuyuka. The story begins with Shuichi discovering his stepsisters masturbating and quickly escalates into a torrent of raw, unadulterated lust. He first seduces the busty, more dominant Fubuki, fucking her relentlessly in various positions, from intense doggystyle to passionate missionary, always ending with a thick creampie deep inside her. Soon after, the more demure and innocent-looking Fuyuka joins their sexual exploits, leading to explosive threesomes. The episodes showcase the siblings exploring every inch of each other's bodies, with detailed scenes of oral sex, deep-throating, anal exploration, and double penetrations. Their illicit affair becomes a daily routine of cum-swapping and orgasm-chasing, pushing the boundaries of their taboo relationship as they fuck their way through the entire house, their moans of pleasure echoing with every thrust.