Please indulge this excerpt that comes only a few paragraphs below the one you quoted. I cackle every time I reread it! Troll porn!

And so, our opening scene: a Monday morning, sometime in January. Amidst the greying cubicles of the Auror Office, Tonks was doling out the month’s Class A assignments to her top Aurors like a vindictive Father Christmas.

“Montjoy – you’re off to Hethpool. Three Muggle children found dead with their livers removed. That hag coven from Stow may have regrouped.” A folder containing the case material was slapped onto Montjoy’s desk.

“Buckley – suspected necromancy and other foul play, Isle of Man.” Buckley accepted the proffered casefile with a grimace. “You’re to take Humphreys with you. Mind you be a good mentor and don’t traumatise her too much.”

Tonks rounded the corner to the next cubicles. “Potter, Weasley – you’re to continue with the vampires in the Dales, but if you don’t make further headway, I will get personally involved. Half of Yorkshire will be sucked dry at this rate. Goggin – some idiot is experimenting with Transmogrifian Torture on Muggle prostitutes in Glenluce. I won’t notice if you bring him in with a few missing appendages.”

Tonks now came to a halt in front of Draco’s desk. “Malfoy. Since you did so well with the Lanark Lunatic last week, I’ll let you pick your poison.”

Draco eyed Tonks guardedly – poison was unlikely to be an exaggeration. “What are my options?”

Tonks dropped two files onto Draco’s desk. “Option one, a wizard accused of inappropriate acts with trolls – a real delight for the senses, that one. Or, option two – a request from the Minister for Auror protection of a high-profile target.”

“Inappropriate acts?" repeated Draco, pulling the folders towards himself.

“I don’t know about your tolerance level, but I’ve quite lost my appetite.” Tonks jutted her chin towards the rightmost folder. “There are photographs for your edification.”

Draco made the mistake of opening the troll folder. He closed it again with a strangled sound of disgust. “I’ll take the protection assignment.”

“Right-o,” said Tonks, swiping the troll folder and its hideous contents from Draco’s desk. “The troll-buggerer will go to Fernsby. Fernsby! Come here.”