"She's easier than a broomstick, Moony," Sirius answered back with a wry smile. A lot more comfortable too, if he did say so himself. Regardless, he made sure to hold the bike steady, his own foot still on the window sill as Remus climbed on behind him.
"Oi, you're going to bruise my ribs there, Lupin," Sirius said teasingly, glancing over his shoulder as soon as Remus was actually on the bike. Really, he wished that Prongs was around to take a picture about now. He wasn't sure if anyone was ever going to believe him.
"You ready?" he asked, kicking off carefully from the sill, but not yet taking full flight.