Well, Viv hadn't been expecting that. She'd been too focused on trying not to moan into the kiss, rocking against his hand, when suddenly, she felt his finger in a rather different area, rather different indeed. She gasped, breaking the kiss and biting her lip for a moment, swallowing before moving to mumble into his ear. "Don't be getting ideas about putting anything else in there, you dirty old man." Her voice was light and she was smirking, however, and she bit her lip again as she rocked her hips, trying to get used to the sensation. It was peculiar, but not uncomfortable.