Moony. Moony. Moony. Only Remus John Lupin would look at a flying motorbike and wonder if he needed a bloody sweater.
"No," Sirius shouted back. "I'll give you my jacket if you get cold, all right?"
He sighed, but was smiling fondly anyway when Remus reappeared tugging his sweater on regardless.
"That depends," Sirius answered. "Do you want to drive or hold on?" He could give what Remus' answer was going to be, but he figured that he had to give Remus the opportunity to do something a little more daring -- although, really, maybe Remus would like it better if he was driving instead of Sirius. And once you were up in the air, there wasn't much to it anyway.