It has already been a few years since Katsuki had started serving Aster as her personal maid. In just these few years, she had already learned a great deal of things when it came to serving the sweets loving Meslatar.
Some might call her Mistress weird or even eccentric, but she knew that those people would not live very long if those words ever slipped out of their mouths. Almost every servant in the Nilm estate was trained in assassination of course.
This was something that was kept hidden from the Mistress by all the staff in the Nilm household.
It was a well known fact that the Nilm family had many layers of secrecy surrounding it, but one fact that many knew was that the Nilm family was involved in the darker sides of politics, which of course included assassinations.
In fact, Katsuki herself had been extensively trained by both Sebastian and Mary in such skills too, although she had not been able to showcase it much in recent days.