After Service Gangbang Addicts / Hokagorinkanchudoku

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Описание: The main character who changed school in the Campus which needed a sister-in-law, the Sayo made of the remarriages of parents.
The Sayo which fell into the measures of Queen, the Erena which influenced Campus in Ura, and became addicted to Sex.
Serve Erena obediently, and help her, or fail in Sayo, and does the tosu side increase oneself, too?….
Service & ring ○ game that I did on the stage of a secret room of the Houkago.