After bringing the captured men in the large room with waitress Lina, the ladies first took all of their clothings off and tied up the men on the bed in various positions. Some with their butt sticking out, some with their legs spread wide apart and some with their ass reaching toward the ask while their little brothers were pointed towards their face.
After this, Elise gave the ass of one of the men a rub and then slapped it. While slapping, she utilised life force to make sure it was going to hurt very badly while also pouring the Corrupted Life force in their budy which made him or feel extremely good. And obviously none of this was going to cause any injuries.
Weiss had explained to Elise about how nerves of a human worked. So she was aware of how pain functioned. Here she was using exactly that knowledge to do what she was doing.
