Dobra

"If you really want to make an offer for someone to share the bed with me, then maybe it's you."

"My lord?" Dobra asks, not expecting the statement.

You tell her that you really understand that she wants to ensure the future of one or both of her daughters but it would be difficult for them to understand her action given that you're the killer of their father.

"But I can tell them to follow your command," Dobra responds

"Then they will not do it willingly," you reply. Now your army is the victor of the battle. That itself is not enough. For your plan to work, the barbarians must perceive your action not as one of a conqueror, but instead a just ruler who seeks justice. Sure, you had an immense satisfaction of killing Vetrix, but there's no need to show it.

"But why me instead?"

You shrug. "If I take one of them," or both you amended silently, "people will think that I am exacting ****. But in your case, they will think that it is you who is trying to gain a favor."

"But I am trying to gain your favor by offering my daughters."

"Yes, but it is the matter of how people see it. Maybe that is the way of Vetrix's people but I want to change that." You are motivated to change that way of thinking. As long as they think that winner takes all, idiots with warped way of thinking will rise challenge your power. You're not going along with that idea. You're going to take all but you wouldn't let them think that. Instead you're going to make them think that you will treat normal people decently and deal with your opponents harshly.

So, let's start with Vetrix... he's already dead.

"Then take me as you wish."

You sigh exaggeratedly. "Dobra. I will be very frank with you. You are very attractive and I wouldn't hesitate to admit that I want to fuck you right now. But, you... you're not sure you want to go through with it. Maybe you think that it's all right and couldn't be helped since the same thing happened with Vetrix. But it's not. I just need your cooperation. As long as you help me, I will ensure your family's well-being."

"Then..."

You gesture to the exit. "Right now, you're feeling apprehensive of your daughters' fate. It's understandable but I assure you, nothing bad will happen to them as long as they cooperate." You call the sentry outside and tell him to get Dobra to her daughters and get them something to eat.