Sirius dodged Remus for awhile, until he suddenly found them face to face. He was about to try his very secret escape technique (feinting left and actually going right), when Remus spoke. Sirius gaped, staring for a second, and then his knees buckle and he succumbs to laughter. Not a few harmless chuckles, either-- he laughed so hard he could barely stand. His eyes watered, his throat and stomached ached, and he had to grasp onto Remus' shoulder for support.

After he finally gained control of himself, he rubbed the hand not holding him up against his red face. "I c-can't believe--" another bout of laughter here. "You did not just say that." He took a deep, slow breath, and finally brought himself to his feet, letting go of his hold of Remus. He smiled to show he was fine, and then the smile slowly spread across his face and he was laughing again. "F-feeling lucky, punk?"

He snickered, finally finished laughing, and then said, "Oh, c'mere," yanking Remus closer by the collar of his shirt and tickling his ribs.