Sweet Home: H na Oneesan wa Suki Desu ka?

Ryuichi Moroboshi is a college student who was living alone. Then one summer day he lost his apartment due to a fire, and he ended up going back to his stepmother Kyōko Moroboshi's place, for he had nowhere else to stay. Now his new housemates Chinatsu Furuhashi, Kaede Soga, Manami Amagi, Risa Tomosato, and Kyōko are treating him as their new sex toy. (Source: ANN)