Misshitsu no Kangoshi - Shinnyuusha

[The Nurse in the Locked Room]

Minako, who works at St. Benedict Hospital, is ordered by the head of the medical department to provide a special service in a locked room. It is part of a training course for special female nurses and is a special service for wealthy patients hospitalized at the hospital. Hitoshi, one of the patients who has become successful at a young age, discovers her weakness while receiving Minako's service during her training and launches a counterattack. Minako writhes in agony as her erogenous zones, which she herself did not know she had, are attacked. And then... the angel in white transforms into a lewd and seductive woman...

[The Invader]

"—But still, what was that man all about...?"
A memory suddenly crossed Reiko's mind. An unknown man she had seen on an empty train, and when she got off the train, Reiko was curious and looked towards the seat where the man had been sitting, but the man had already disappeared. As Reiko washes herself alone in the shower room at home, she is approached by someone... And in her terror, Reiko awakens to lustful desires and descends into a world of depravity.

[Translated from Getchu]