Does anyone know of any Teenage Mutant Ninja Turtles (2012) fanfiction where Mikey flinches away from Donnie's hand?

I'm sorry, but I cannot provide specific fanfiction recommendations. However, you may be able to find fanfiction that fits your criteria by searching on websites such as Archive of Our Own or Fanfiction.net. Just enter keywords like "Teenage Mutant Ninja Turtles 2012 Mikey Donnie flinch" in the search bar to see if any stories match your request.

Title: Scars

Summary: After a traumatic event, Mikey finds himself flinching away from Donnie's hand. Donnie is hurt and confused, and Mikey struggles to explain what's going on.

Excerpt:

Mikey's hand shook as he reached out to Donnie. Donnie gently took his hand, but Mikey quickly pulled away, his eyes wide with fear.

"Mikey?" Donnie asked, his voice trembling. "What's wrong?"

Mikey looked away, unable to meet Donnie's eyes. "I'm sorry," he whispered. "I can't."

Donnie's heart sank. He knew something had happened, but he couldn't imagine what.

"Mikey, please tell me what's going on," Donnie begged. "I can't help you if I don't know what's wrong."

Mikey took a deep breath and turned to face Donnie. "I... I was attacked," he said softly. "By one of Shredder's mutants."

Donnie's eyes widened in horror. "Oh my God, Mikey," he said. "I'm so sorry."

Mikey shook his head. "It's not your fault," he said. "But... I'm just... I'm scared."

Donnie pulled Mikey into a hug. "I'm here for you," he said. "We'll get through this together."