Lydia frowned at that whimper. Other than a few incidents in her youth she was quite proud of herself as a mistress, and she had honed her skills to know what a slave wasn't telling her. That whimper was not a good one, in the slightest.
Disentangling her fingers from his curls, Lydia turned and crouched in front of Isaac. "Do you remember your safe word, pet?"