Sam, a black man, ends up staying with an ordinary family as a homestay student. As they barely communicate with each other, Sam's wife Reiko becomes aroused by his body and big cock and loses her senses. Reiko finally seduces Sam and cums over and over again with his big cock. When the family isn't looking, Reiko indulges in Sam's wild sex. What will become of Reiko as she becomes addicted to Sam's big cock?