Nerdy Stepdaughter Caught Masturbating

Your house air conditioner is broken and it's so hot inside. Your stepdaughter wants a fan and when you bring it to her, she is actually touching herself. You admire her sweet pussy rubbing for a minute and when she sees you, she actually likes it. She decides that you get to watch her a little bit more, nothing wrong with that one right? Well your cock gets hard and she wants to see how stepdaddy's cock looks like fully erect. From there she can only think about fucking you. Can you turn her down? I know I couldn't.