[It takes her a moment to adjust the settings. This is starting to get personal enough that she doesn't think it's suitable for public knowledge.]

My progenitor was a sadistic bastard.

[Notably she doesn't even call him her father. Just progenitor to explain the relationship in a way that would make sense to a human unfamiliar with Naraku.]

One of his powers allowed him to squeeze my heart from a long distance away and put me in excruciating pain. He liked to remind me that he held my life in the palm of his hand.