Sirius had been testing out his new power by holding a broomstick in the air. When he heard a familiar voice, he dropped it immediately.

"Remus?" First the ghost of a smile crossed his lips, then a genuine one. Even soaking wet, Remus was the best thing he'd seen in days, weeks even. "Oh Merlin, I'm glad to see you."

He was working under the assumption that Remus was from his time, after everything had been sorted out and not, say, moments before. He really should have learned not to assume things by now.