Dear Wife. I May Have Impregnated My Sister, With Whom I Am Not Related By Blood… Hikari Ninomiya

Storyline

His parents remarried 10 years ago, and he and Hikari became siblings. Although she wasn't related by blood, she hadn't seen her as the opposite sex, probably because of her age difference. However, during the two years we haven't seen each other, her sister-in-law Hikari has matured a lot. I see Hikari as a woman now.

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