Sex wasn't enough of a reason for Rodolphus to manipulate her mind for years. She'd offered him what she had long before he ever cast the first spell. If all he wanted was a warm place to cram his cock, she'd already given it to him and would've continued to do so without hesitation. Why would he have his brother introduce her to the adulterated, illegal potions after she'd already climbed in and out of his bed more times than either of them could recall? There was something more, something that she feared she would never discover.