My sister is a loving nurse who can't stand it

My brother-in-law is admitted to the hospital where my sister-in-law, Kokoro, is a nurse. Kokoro goes out with the doctor and works hard at having sex in the hospital. The doctor is jealous of how close he is to his brother-in-law and orders him to wipe his body. The two confess their suppressed feelings, and in the middle of the night in the hospital room, the two confess their feelings... They have been suppressing their feelings, so they become sexually active as if the dam has been turned off.