It had been an impulse buy from one of her random trips into muggle London. She'd passed by an adult novelty store and gotten curious. After she'd searched around for a while, she'd come across the toy. Intrigued by it, she started reading the box and knew it was perfect for her plan. Quickly buying it, she had brought it home, stashing it away while hoping Hermione wouldn't find it. Thankfully the Gryffindor had been none the wiser.