Jack had watched the road ahead like a hawk, looking for any sign of a jeep or the Doctor.
It was then that he spotted the sign for the motel and as they approached it he saw the jeep.
"There!" he cried and was out of the jeep before Ianto had time to stop.
He ran until he was nearly at the room the jeep was parked in front of. He stopped when he heard noises that were definitely not of someone in pain...it sounded like someone in the throes of passion...it sounded like the Doctor.
He snapped then, that thing was taking what should have been his privilege to take and the Doctor sounded like he was all too willing.
With a snarl of indignant rage and hurt pride, he drew back his leg and kicked open the door and froze at what he saw...there was the Doctor, back arched, head thrown back in ecstasy and underneath him was...him.
"Get the hell out of him!" he roared and his double's head turned and he snarled.
"Too late human," and with force smacked his hand against the Doctor's chest, which caused the Doctor to snap his head back, a look of intense pleasure on his face.
With a roar of rage, Jack lunged for the bed, hoping to separate the Doctor from the thing that was pretending to be him.
He'd only gone a few paces, when he slammed against an invisible wall and he heard the door behind him slam shut.
"Too late human, he is mine."
Jack could only watch in horror as his double's hand seemed to merge with the Doctor's skin and he let out a moan that should have sent shivers down Jack's spine.
His double let out a groan that made the Doctor look down at his lover and open his eyes; he wanted to see the pleasure he was giving Jack and got the shock of his life as Jack seemed to flicker...just for a second and he saw something that killed his lust.
"You're not Jack!" he gasped as he felt pain like he had never felt before.
"Gullible Time Lord, too late," it snarled and with a growl began to suck the life from the Doctor.
The Doctor tried to move off the not-Jack, but found he couldn't and when he looked down he saw why.
The not-Jack's hand was fused to his chest and any pleasure he'd experience was now turning to pain and he began to feel fear when he realised what was happening...the not-Jack was draining the life out of him.
His eyes locked with what he had once thought was Jack and he saw in them his own death.
It was then that he heard someone shouting at him from far away and he wrenched his eyes away from the thing that was now raping him and killing him.
His eyes took in the owner of the voice and this time he knew it must be the real Jack...the rage and fear in his eyes betrayed who he was.
"Do not fight me Time Lord or I will kill him again and this time I will make him suffer, make the one you love scream as I burn him. Give yourself to me."
The Doctor's eyes snapped back to the not Jack as it snarled the words and for the first time he saw the not Jack for what it really was.
Something snapped inside him... he opened that part of his mind that he'd closed off after the Time War...the part that had allowed him to kill millions. He knew the consequences of what he was about to do, but if it meant it would destroy the thing that was violating and feeding off him, then it was worth it.
If it meant he would save this world and prevent the death of millions of humans, then it was worth it.
The only regret he had...well that didn't matter now.
All these thoughts ran through his head in the seconds it took to open the floodgates and let the Oncoming Storm ...the Destroyer of Worlds loose.
"Then have me," he snarled and golden light began to radiate from his body.
It had been revelling in the fact that he had complete control of the Time Lord and it was revelling in how much it was enjoying the carnal act that humans called sex...and it revelled in the fact that it would soon feed on the Time Lord
Then the human whose form it had taken had burst into the room and it laughed and had snarled that he was too late.
It gloated as the human beat his hands against the barrier as it fused itself to the chest of the Time Lord and began feeding off him.
The taste of something it hadn't eaten for an eternity sent it into a state of ecstasy it hadn't felt in eons...but it was short-lived as it realised it had made a mistake as soon as it threats towards the human left its borrowed mouth.
It felt the change in the Time Lord, from compliant prey, to prey that was turning and bringing the fight to the predator.
"Are you trying to scare me with your power?" it snarled. "If you want to fight me, then let us fight."
It poured its own power into the Time Lord and the golden light flashed like a super nova and enveloped it and the Time Lord.
Jack had thrown himself against the barrier, screaming promises to kill the thing as it was pulling the life out of the Doctor.
He could vaguely hear Ianto and Doctor Stoneleigh pounding on the door.
But even that faded when the Doctor had looked at him and seen the fear and the love in those eyes.
Then the moment was gone as the Doctor snarled words at his double and the room exploded into golden light.
The light faded as quickly as it had flashed into life and Jack blinked and wiped away tears that had formed as his eyes watered.
He was no longer in the motel room...he was unsure of where he was. It took a few seconds for his eyes to clear and then he saw exactly where they were.
They were back in the town where this had all started.
Ash was falling and the skies were black and the buildings were shadows against the fires that were raging unabated...it looked and felt and smelt like hell.
Then he heard it...the roar of the creature, the thing that was taking the Doctor's life.
He began to run ignoring the crunch of bones and the smell of the dead...he had to stop that thing, even if it did kill him this time.
He was clambering over a ruined building, when he saw the flashes of light.
He crested a pile of rubble, expecting to see the Doctor being devoured by the creature in its true form.
Someone was being be devoured but he wasn't sure who as below him, the Doctor and his double were locked, not in that fatal embrace but in a fight that would end with the death of one of them.