"Step Daughter Fetish"

You've just found your stepdaughter chilling in her room reading a fetish book of yours. She's unaware you're watching her, and you can see her getting turned on while reading your book, and it's turning you on, especially where you can see a bit of her nipple. After she spots you and you confirm the book belongs to you, she admits she finds it quite hot and can see the way you're looking at her and her tits... ?