When Moony went into the bed, Sirius nuzzled into his warmth and crooked his head into the area between Remus’ neck and shoulder blade. He kissed it lightly and bit it playfully. Remus laughed at him and smacked his ass. Sirius yelped and Moony taunted, "Bad dog." The Grim Animagus looked at him with a crinkle in his eyes that shows up when he is amused.