I Was Going To Tempt My Cherry Boy Brother... But The Script Got Flipped! A Defenseless Sister With Colossal Tits Who Gets Fucked A Lot By Her Unequalled Younger Brother Mako Oda

Mako returns to her family home to help with housework as her mother is hospitalized with an illness. While chatting with her father, her younger brother comes home but acts strangely distant. Curious, Mako peeks into his room and finds he bought an onahole. Realizing from his cluelessness that he's a virgin, Mako teases him, but he uses his adolescent strength to pin her down... From that day on, she ends up getting fucked at the mercy of her brother's sexual urges.