The husband's stepson turns out to be the man his stepmother, Kiriko Shirosaki, used to love. Although they are a little confused about this reunion, they are unconsciously attracted to each other and eventually can't help but masturbate in each other's rooms... But then he wants to move out, which makes Kiriko Shirosaki decide to abandon her status as his stepmother and confess her feelings to him, and they have sex...
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