What is new and unique to this world is the soft sound that starts up once Byleth begins his gentle ministrations. After the first few passes through scalp and hair a sound starts up from somewhere between Themis's chest and throat. It's soft at first, before turning into a rolling sort of thrumming.

Not a purr, not quite. Nor is it quite a rumble.

It's something halfway between the two, and though he does not cease it once he notices, there is a catch in Themis's breathing when he becomes aware of it. He does not tense, no, and it is obvious that his enjoyment of the scratching and petting has been made stronger by his draconic traits.

His cheeks color, and his voice comes as a whisper. "My apologies for the disturbance."