Three Rules of a Younger Sister
85Momono and her husband have moved in with her brother-in-law, an illustrator of adult art.
After being caught masturbating while looking at one of his drawings, she is forced to agree to a specific condition in exchange for keeping the incident a secret: she must live as her brother-in-law's younger sister. As she endures the humiliation of this role, her body begins to respond in unexpected ways...
(Source: Fanza, translated)
Note: Published in comic Anthurium Vol. 41.
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