The older sister has big breasts and has been having an affair with a man from the same company. The younger sister masturbates while watching her older sister and her lover kiss. The lover comes on to the younger sister when the older sister is not around, but the younger sister, who is interested in sex, is aroused and has intense sex with the lover. The older sister gives up on the lover and seduces another man, and has intense sex with him, shaking her big breasts and feeling great. They are sisters who really love sex.