A man and a woman who appear to be colleagues got drunk and missed the last train. The woman is taken care of gently and becomes aroused by the atmosphere of being alone with him, and in their drunken state, they end up becoming romantically involved. The plain man, who she hadn't noticed before, has a magnificent penis that throbs with excitement...!? The woman climaxes over and over again with a pleasure she has never experienced before, and it seems she will never be able to escape this pleasure...