Her father had a terrible stomachache and so they went over to the hospital. The nurse came to help. She was quite attracted to her father, but did not want her there and sent his daughter out of the room. While she was gone, the nurse immediately went to work on him with her mouth.
When the daughter returned, she caught them and kicked the nurse out. The daughter wanted to have some alone time with her father. She did not want to share his cock with anyone else, especially not that nurse.
However, of course in the end, the nurse and his daughter decided to make up and have their way with him. He was the one that was not feeling well. They realized that if they spent a little time sharing him, then he would feel better that much faster.