"Better not be," Nathan replied in the same tone, though his narrow-eyed look was more serious. His possessiveness wasn't exactly a secret. He summoned another house-elf and requested some extra towels and other amenities, including his toothbrush from his own bathroom and the shampoo and condition that he liked, since he had no idea what Charles might or might not have.

...On that thought, he leant close to the house-elf and mumbled a request for a bottle of lube, too. You know. Just in case it was needed for anything.