OBA191 — I want to tie my mother down!

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Minako lost her husband three years ago and was in a state of distress, but recently she started attending a certain culture school and her son Kenji felt relieved. One day, Kenji finds out. The culture school that Minako attended was a culture school that teaches "bondage" specializing in housewives. After seeing her mother's "unusual appearance" and the "root marks" that remain on her body, Kenji impulsively hangs a rope on Minako...