One would think that at a certain point Branwen would run out of astonishment and scandalous exclamations.  She did about a triple take between algae bloom, Pepper, and the wheel.  Up until this point she could have easily claimed Kidnapping by an Artist as excuse for her illicit air travel, but if she actually moved to maneuver the contraband? Well, it'd be indefensible.

"I hardly -! I should think-! Of all the-! Are you looking where you are going!"

He was.

"You just..?" She gestured vaguely at his feet on the pedals.  Then, "and just there...?" his hand on the leather-wrapped wheel.  "And it just...?" She shrugged at the landscape's gentle parallax below them.

"Well. Budge over. You only live once!"

Branwen didn't take much persuading at all. Of course she was going to take a drive. That was half the ploy of getting her up there!

"You just…?"
"Mhmmm."
"And just there…"
"That's right."
"And it just…?"
"Yep."

Knocking the car out of gear, relying on the coasting and levitation charms to keep it puttering along in neutral, Monty clambered between the gap in the seats to the back to let Branwen scoot along around the gearstick and handbrake before he took her place in the passenger seat.

"Right, got to get her back in gear first, so press your left foot on the left peddle, yes, all the way down, and here, left hand," without hesitation he clasped his over hers and helped her find the first flying gear and then let go of her hand again.

"Now press a little on the far right peddle with your right foot, good, and left the left off smoothly to let the clutch in - yep, yep - and we're off!"

The car burbled along through the air again.
"Get a feel for the steering at this speed - rather like a broom, no hasty movements, then when you're ready, pop her into second, remember, clutch with the left foot again, nice and smoothly when you lift your foot. She'll look after you." He patted the dashboard an enormous grin beneath his beard.

Determined now to not be made a delicate daisy, Branwen jutted her chin forward and took to her tutelage like a grizzled juniper: ancient, savvy, knotty, and full of twists and turns.  She barked quick little questions at Pepper and wasn't concerned at his familiar handling of her hands over the levers.

"Well, that's alright, isn't it," she said, a firm evaluation. "What's the harm in this?  Honestly, Pepper, if you told me just earlier today that I'd be willingly engaging in criminal behavior I'd have thought you had been reading my journal and knew about my machinations to - MERLIN!"

Midst her chatter, she'd done as instructed and done the motions requisite to shifting the car into second gear and it transitioned with a crunching jolt! 

"Easy now!" She laughed as she corrected the burst of speed and pressed the pedal on the right a bit more.  "I could get good at this, Pepper. There's nothing natural about an automobile flying through the air as prettily as a broomstick, but there's yet something very appealing about it.  Shame!"

It was a shame, of course, that the flying of cars was illegal.  With Pepper's help, they made a long wide banking turn to make their way back towards Hogsmeade.  They had a disagreement about who would land the thing, but Branwen had her way that Pepper would bring them safely aground.

Back on terra firma, Branwen was filled with the oddest of sensations.  The lack of any vibration or movement beneath her feet was deafening.  The absolutely stillness itself seemed to teeter her off balance.   She also realized their trip had exhausted her. 

"A thrill, Pepper.  You'll say hello to Ambrose for me?  Make sure he knows I was brave," she said with pride.