The older sister is a female doctor and the younger sister is a beautiful nurse. For some reason, the two of them have a high chance of encountering "men showing off their erections" who expose their rock hard dicks. The older sister, who loves her younger sister, has a life of escaping danger by making her sister ejaculate with her fingers and tongue in order to protect her sister from the men showing off their erections. However, the younger sister gets excited when she sees a hard cock and has a habit of servicing it with her mouth...!! Today, the sisters may be licking the dicks of strange men and patients!