Sirius laughed at the pun Remus made, not so much because it was funny as because he was pleased to have him there.
"Hm," he said as he looked Remus over and accepted a mug. "Not my usual lab rat, but if the job takes a wolf...." He winked at Moony, downed a small swallow of the tea, added some sugar and tried it again. Setting it down, he shrugged. "All right. "Lu-PI-ci-NUS." He recalled his arrogance, and added that in. "Lu-PI-ci-NUS!Lu-PI-ci-NUS."
A twitch of his right wrist and his wand dropped into his hand, pointed out and down. He raised it. "Ready, Moony?"