Sirius snickered. Mary had no idea just how much of a dog he truly was.. and how much he enjoyed the pettings. If he had been Padfoot, the simple strokes at his head would have had him kicking a leg probably and wagging his tail. As it were.. in human form, he only smiled in content and settled down further, his eyes fluttering closed as Mary played with his hair.
This was nice. It was pleasant.. and he should very well like to do it more often.
He opened his eyes slowly and looked up at Mary, a slow grin spreading across his features as he peered into her face. He was so.. relaxed. Merlin.
"Shampoo?" he said and let his eyes close again, "... I just eat a raw egg, makes the coat nice and shiny.. soft... otherwise I use whatever I have, huh? I don't even know.. off the shelf, first thing I see." And that was mostly true, Sirius never paid much attention to the things he shopped for.