'Engorgio!'
The spell burst from Harry's wand, went hurtling down the corridor towards the fallen masonry. Harry was rewarded with a gasp, and he ground to a halt, spinning on his heels to see how effectively his spell had worked.
For a second, he was utterly bewildered. Draco was standing completely motionless, and it was obviously him that had gasped, as there was no-one else around to have done it. And clearly he had gasped because the spell had hit. But Harry, noticing that Draco was indeed still standing, rather than lying on the floor - was confused to see that none of the chunks of rubble had been affected by his charm.
What, then, had he hit?
Almost as soon as the question had formed in his head, Harry was granted the answer right before him.
Draco's face contorted from a look of horror to an expression of mild discomfort. Harry watched as Malfoy's fist clenched tightly against his wand, and the blonde boy became so rigid that he seemed to be standing up on tiptoe. Harry's mouth slowly fell open as Draco's head rose steadily higher, and he stared down at the boy's feet - he was not on tiptoe at all.
Ron suddenly appeared at Harry's side, bent over with his hands on his knees, panting for breath.
'Harry,' he gasped, 'why - did - you - stop?'
Harry didn't answer. Ron, eager for an explanation, turned to face his friend, but then saw the creeping terror spread across his face. He followed Harry's wide-eyed stare down the corridor and gaped at what was happening before him.
Draco was rising higher and higher by the second. Not only was he growing taller, but wider, too - proportionately expanding right infront of the two Gryffindor students, who stood rooted to the spot. Draco, who's face was still pulled into a tight grimace, groaned with the increased strain of his transformation. His expensive black suit began to tear at the seams and split at the steady expansion of his slender frame. His chest heaved in and out with each sharp breath, sending his shirt buttons popping off against the walls and windows that still remained intact. His blazer came apart at the seams, tearing from the new measurements of his back and arms. His leather belt creaked and writhed as his waist, still lithe and slim, was pushing it to its limits - and suddenly it snapped, the metal Malfoy crest-shaped buckle whipping Harry across the face, gouging his cheek. The fitted trousers revealed more and more of his ankles and shins as he rose, and then they ripped as his thighs burst through. His shiny, formal, size 12 shoes split and frayed as his long feet fought for freedom.
As Draco's height surpassed 10ft, his mammoth feet exploded from their stiff confines and sent shoe-leather and shreds of black sock flurrying around him, and as he progressively grew up to 14ft tall, the rest of his body escaped from his too-small clothes with an almost deafing rip, and the growth finally stopped.
Now wearing just a pair of tight, black and green boxer shorts, the 14ft tall Malfoy eased the grip on his wand and a look of calm washed over his face.
Harry and Ron were unable to speak. They stood, staring at Draco's massive, slim but toned body, his blonde head just millimetres away from the ceiling. They stared too at the revealing boxers, comically small on the giant's frame, and they were faced with the alarming sight of Malfoy's sizeable cock. They were both filled with an uncertain mix of dread, curiosity and lust.
Some moments passed without anyone uttering a word; Harry and Ron, stunned into silence, simply gawped at Draco as he swayed, eyes closed, trying to compose himself after his entire body had been beseiged by an irritating and unrelenting cramp.
Breathing deeply, and finally feeling his body relaxed and his mind at ease, Draco opened his eyes and was confronted with the new reality.
'Oh, christ ...'
Draco decides to...