GFD-001 — I Want My Younger Sister, Who Doesn't Even Know The Meaning Of Service, To Play With My Nipples As If We Were Playing House. Yayoi Amane

Will you do it so that my nipples feel good too? After witnessing her brother masturbating, Yayoi helps him with his nipples. At first, Yayoi is confused by the act itself, but as she begins to feel happy seeing her brother writhing in agony and his expression, perhaps driven by her desire to be more useful, she quickly becomes better at nipple play. ... A forbidden nipple play that brings out her wicked maternal instinct as a woman.