The series 'Uba' explores the forbidden, incestuous relationship that blossoms between the young, innocent Makoto and his voluptuous step-grandmother, Shizue. It all begins when Makoto discovers Shizue in the throes of self-pleasure, her massive, milk-filled tits heaving as she moans his name. This accidental discovery ignites a burning lust between them. Shizue, overwhelmed by her carnal desires, starts seducing her step-grandson, using her mature, experienced body to teach him the depths of sexual depravity. Their encounters escalate from tentative breast-suckling, where Makoto eagerly latches onto her swollen nipples and drinks her sweet lactation, to full-blown, raw fucking. Each episode dives deeper into their taboo affair, showcasing Shizue riding Makoto's eager young cock, his shaft disappearing completely inside her wet, welcoming cunt. They fuck in every conceivable position, with close-ups on his cock sliding in and out of her dripping slit, her massive breasts bouncing with every powerful thrust. The series climaxes with them abandoning all pretense, fucking openly and passionately, fully consumed by their shared, incestuous ecstasy, culminating in Makoto breeding his grandmother and filling her womb with his seed.