Japanese nurses know their way around unconventional medicine. The pills they put in the patient's mouth are no chemicals, only herbs. By lifting his dick and discharging their pussies on it, they gave him some of their life force. Of course, after this manipulation of his dick, the man recovered at a tremendous pace. Man, what advanced medicine!
To tell you the truth, considering the age of the brother and sister, it is quite normal that the brother became aroused by the sight of the naked girl in front of him. Maybe what happened next is not part of the plans of normality, but tell me honestly, would you resist such a dark-haired beauty? That's what I mean.