[Ruibosucha] Bitch Ane no Fukushuu - Oya no Takara no Tensai Otouto o Sex Zuke ni Shite Daraku Sasete Yaru

A possessive older sister turns the family’s devotion to its “genius” younger brother into a weapon, driving their taboo bond into a feverish reversal of power. What begins with ruthless sexual assertiveness and repeated declarations of surrender gives way to startling vulnerability when her pregnancy leaves her wondering whether she can become a good mother. By the end, the central tension rests less on conquest than on possessiveness, fertility, and the uneasy future of their forbidden family.