Lucius always had plenty of gold, goblins were always greedy, and Harry tended to be a bit slow on the uptake. Series of one-shots.
A Day At Gringotts
Harry had been wasting away on his bed when the letter came. His relatives were enjoying lunch in the kitchen, he was locked in his room, and there seemed to be no way to avoid the heat. He had been thinking of how much he wanted water, and how closely his life was resembling hell this week, with the heat and all, when a tawny owl flew into his room.
The owl, having landed on the back of his desk chair, hooted at him sternly. Harry sat up abruptly, blinking the black spots from his eyes.
"Hullo, there," Harry said awkwardly, trying to avoid eye contact with the owl as he got up to untie the letter. He was feeling rather dizzy. Is today Tuesday or Wednesday? He honestly couldn't remember.
Mr. H. Potter:
An urgent matter pertaining to the will of your late godfather, Sirius Black, requires your presence as soon as you are available.
This letter can be used as a portkey to a meeting room in Gringotts. When needed, put a hand to the paper, and state clearly, 'Dispatch.' A goblin will be waiting.
Axeface
Inheritance Office
"Looks interesting," Harry muttered to himself, reaching for the cup on his desk. He put it down again in frustration, realizing it was empty. He glanced at the letter again, staring at the official seal of Gringotts. "Merlin's balls, I suppose I have nothing better to do. I hope they offer tea."
Harry, right hand holding his wand, his knuckles white, leaned forward to touch his left hand to the letter. "Dispatch."
He vanished with a small stumble towards his bed.
6 hours earlier
Axeface sat with a blank face as he wrote out a letter to a Mr. H Potter. Lucius Malfoy was dictating the words, his right according to the new bag of gold sitting in Axeface's top desk drawer.
He signed his name with a flourish, sat back in his chair, and snarled his best goblin snarl at the blond wizard. "You can't be serious."
"It will do, I think," Lucius said. The smile looked out of place on the man's lips. "And you will have a goblin waiting, of course." The wizard leaned forward sternly.
"Yes, yes, of course. It's a simple matter. But surely the Boy-Who-Lived wouldn't be so foolish as to use this Portkey." The goblin looked up harshly into the man's unblinking eyes. "All goblins and all wizards know of our ongoing blood war. If he should take the Portkey, he surrenders himself to our laws."
"I assure you, Axeface, Mr. Potter is quite the Muggle. Make sure the goblin waiting for Mr. Potter's arrival stays long enough to be sure that Mr. Potter remains dead. Good day and good gold, goblin." And with those words, Lucius Malfoy strode of out Gringotts. Taking his Lord's greatest enemy's head off at the neck took only a half hour and 100 galleons.