Iori lives in a mansion left by her deceased parents, where her younger brother and his new wife come to stay. Every night, the sounds of the newlyweds' intimacy from the next room drive her to the brink, until her desires finally explode! Unwilling to lose her precious brother, the brother-complex sister takes over his ejaculation management, always right beside his wife... A total of 10 consecutive ejaculations! Incest sex until his balls are completely empty!