DANDY-521 — "'Let Me Put It In Just 3Cm In The Cowgirl Position!' The Big-Breasted Sister, A Night-Shift Nurse Who Is Constantly Sexually Harassed By Patients, Inserts Her Brother's Wild Cock, Whose Erection Won't Go Down Due To Abstinence, While Suppressing Her Voice! Unexpectedly, He Has Multiple Orgasms!" Vol.1

A nurse with big breasts attracts the attention of not only the patients but also the doctors in the hospital. The nurse's brother, who is hospitalized, is secretly masturbating when the older sister sees him. Unable to resist, the younger brother asks for help. The older sister reluctantly agrees, but the younger brother's demands escalate, and he finally penetrates her. The older sister is also excited by her brother's wild cock, and cums over and over again while trying to suppress her voice.