Jenni is reasonable. She knows what is right and what is absolutely forbidden. Christoffer is her stepbrother. Suddenly, Jenni starts seeing him in a new light. And she is not just seeing and looking at him - she wants him. Jenni tries to put suppress her erotic desire. Being turned on by your stepbrother is absolutely unacceptable.
But when the feelings don't go away, she decides to welcome them.