"Oh, all right. Fine." Gaius gave an exaggerated sigh, but he wriggled his arse at Sirius playfully before he ran up the stairs. It might not be magic, but he was fortunately quite fast even without the aid of wizardry, and throwing on jeans and a jumper and stepping into his trainers took no time at all. Then he was running back down the stairs again, and he threw his arms around Sirius.
"There, I'm back! Didn't even have time to miss me, did you?"