In order to strengthen the combat ability of the Valkyrie, it is essential to run several tests, which takes a lot of time to carry out. However, Grey Snake shortened this process by using certain techniques ( hard plug ), by using this method, the whole body was transformed into a sensual zone. Because of the temporary removal of the Valkyrie armor, neither high or envy is suppressed. During the 12 hour progress, Bronya’s orgasms hardly ever stopped. Of course, unconsciousness, the body’s self-protection mechanism is not allowed. When she is found to be unconscious, the brainwashing device will force her to wake up. Every time this is repeated, the sexual stamp will increase her sensitivity by 10 times. When she became aware of this mechanism and tried to stay conscious during orgasm. Sensitivity was adjusted upward by 100 hundred.