When they arrive he tells her what he needs her to do

Soon they arrived to his cave. She looked around finding it dark and messy but it wasn't like she had much choice.

Soon Kazex stopped and looked at her. "Now here's the deal. I left my tribe long ago to start my own. But I have a problem. Can you tell what that is?"

Elona looked around for a moment. "Ummm....there's no one here?"

"Bingo!" Kazex said. "This is what I need from you. I need to use you to breed a whole tribe with. That of course means you will be fucked and knocked up constantly. That's what you need to do to stay here."