Cedric scoffs at the idea that he couldn't possibly handle it, though he does cling a little tighter. "What do you think I am, a herbologist?" he says into Sirius's ear.

That said, he leans back and yells. "Yeah!" This'll be quite the ride. He's sure of that already. He can already see some of what Sirius enjoys. The thrum of the engine beneath them has a different feel than a broom, but he can see how it'd be comforting.