She wants a child, and Karura explains the process to her, so she jumps hakuoro one night. Like, literally. It's pretty incredibly painful for both of them, then Hakuoro says 'fine,' takes it out and warms her up properly, then they have a nice little romp. She makes a point of swallowing afterward, and explains. And Hakuoro's like "Uhh... That's not gonna do it..."