Based on a tumblr post by @angstprompts.
(Btw: Psychologically Damaged!Isaac ahead.)Scott had been out of his mind with worry for three weeks. Three weeks did the pack spend searching for Isaac, and for three weeks did they come up with nothing. Not a day had gone by without Scott puking, crying, or/and breaking something. They were all ready to give up, to stop looking. Until they finally found what they were looking for: the Dread Doctor's lair.
"Isaac!" Scott called, dashing from room to room. "Isaac, are you here?" Scott had been an emotional wreck for weeks, the panic in his voice clawed at his throat. If Isaac wasn't here, they would be no where else to look. Finally, Scott, Stiles, and Liam reached the lowest level of the building. The basement.
And as if some sort of magic wish of Scott's had been granted, Isaac was down there.
But he was not safe and sound.
"Isaac!" Scott cried, running over to free the shackles that were laced around his ankles. Scott felt relief flooded through his veins, but it was short lived.
"Sc.. Scott?" For a spilt second, Isaac looked happy to see him, but his face quickly fell, and he flinched beneath the other boy's touch. "No.. you-.. you're not real.." He hissed. Isaac flew himself into the corner, his hands pressed over his ears so harshly, Scott thought he was going to implode. "Get away from me!" Isaac shrieked, rocking back and fourth.Scott was to paralyzed to move, shocked at Isaac's new state. His clothes were ripped and dirty, and his eyes had lost someone of that child-like innocence he had always had. His heart was tearing in two.
"He's pretty fragile, isn't he?"Scott turn his head in Theo's direction. A sickly smirk was planted on his face. Scott growled. "It's amazing how much that guy can take."
Scott pinned Theo against the wall. "What did you do to him?" Scott screamed, tears welling in his eyes.
Theo chuckled. "He did it all himself, Scotty boy. I mean, all I had to do was lock him in a freezer, give him a few hallucinations and viola, he's crazy."
Scott roared in his face, but it had no effect. Theo continued to laugh in his face. In a fit of rage, Scott threw Theo to the ground, punching him mercilessly. Stiles attempted to pull him back, but Scott flung him backward. Stiles hit the ground with a thud.
"Scott! Scott!"
Theo looked up at him, blood stained his teeth and soaked his face, yet he still grinned. "Kill me, Scott. Show them your true potential."
For a moment, Scott froze.
Theo snarled. "Isaac was weak. Just like you."
Scott snapped, beating him senseless. With every punch, the sorrow he had felt over the past couple of weeks was replaced with angry. White hot rage filled him, blinding all of his morals.
"Scott!" Stiles called. "We don't kill people!"
Scott turned to him briefly, his knuckles covered in red. "We do now."Scott punched Theo's body well after he was dead. He punched him until Scott was so tired he couldn't lift his arm anymore more. He was so angry, he almost forgot about Isaac, shivering into the corner. He ran over to his boyfriend
"Don't touch me!" Isaac wailed continuously. "You're not him!"
Scott throat was dry and coarse, attempting to hold him. "Isaac, it's okay. It's Scott. It's okay!"
"No!" Isaac screamed, thrashing about in his arms. "Let me go!"
He cradled the other boy gently, despite his. heartbroken cries. "It's Scott. This is real. You're going to be fine, okay? Your coming home," Scott couldn't keep his voice from cracking.***
When they returned to the McCall household, Isaac didn't say a word. He clung to Scott's arm like a drowning cat. Looking as though if he let go, he would loose him forever. His eyes were fixed and terror filled, and his mouth was glued shut.
Washing Theo's blood off of his hands made Scott feel dirty. He had gone so long without killing a single soul, but for some reason tonight, he lost it. Shame filled him.
"Did you kill him?" Isaac asked, voice still quivering. This was the first time he had spoke in hours.
Scott sat next to him on the bed, gingerly. He handled the blonde delicately, afraid he might shatter at any given moment.
"Yeah. I did." Scott said, moving a hair of hair out of his eyes. "Are you okay?" He whispered, knowing full well that Isaac wasn't.
His eyes drifted else where, and Isaac tensed.
"I-.. I thought he was you."
"I know."
"I even kissed him," Isaac admitted shamefully, starting to cry.
"I know."
"I'm sorry," he sobbed. "I'm so, so, sorry."
"I know."That's when Isaac woke to on the cold metal floor, crying. Face to face with yet again, Theo. Tapping the metal freezer box maliciously.
(I'm republishing this due to a glitch)

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Scisaac One Shots!
FanfictionA collection of shots about the beautiful Scott McCall and Isaac Lahey. Requests/prompts welcome! Please DM me instead of posting it in the comments though. (cover art: brumous.tumblr.com)