Be “merciful” to a measure

You tell the younger sister “We have no problem with you, just with those who would **** us. She and those guys would have **** tortured and killed us just for their own amusement, but you tried to stop them. For that you can leave unharmed.”

The young woman was crying “Please, let my sister go!”

You shake your head. “She must be punished. I believe the best punishment is to receive what she would have done unto others, and probably already has done.”

The younger sister, Sandra according to her details, (and a level 1 Cleric) “Please, I beg you, don’t!”

You look at your whores for a moment and smile, “I agree to hold off on torturing her, but you have to do something for me.”

The captive, Ginny (a level 2 Blade dancer) suddenly started thrashing around and trying to scream through her gag.

You grin. “I see Ginny here has figured it out, in part. I want to make use of both of you as my sex slaves for a while, and for Ginny here to be your sub! What do you think?”

Sandra was stunned and silent for a bit. That would not do, so Ginny was shoved onto her back, and kicked in her cunt, hard!

Sandra broke down and cried. “You win!”

Sandra stripped and Ginny’s clothing was cut from her body.

You started fucking Ginny roughly, slapping her ass and tits hard, mangling them, while your whores made love to Sandra.

Next you had Sandra fuck Ginny’s mouth as you did her doggy style

While fucking both of them, you bite both of them at different times, drinking some of their blood, telling each of them "You belong to me, slut!" You made them swear they belonged to you.

You spent the next hour in a nice small reverse gangbang. When the sisters passed out, it was with Sandra on Ginny’s face, and tree branches in Ginny’s ass and pussy.