Dean Winchester paced back and forth in the bunker's library, his jaw clenched and his fists balled up in frustration. The mark of Cain burned like a hot brand on his arm, its dark power surging through his veins and filling him with a dangerous rage.

Y/N watched him from a distance, their heart aching at the sight of Dean struggling with the mark's dark influence. They knew how much he was trying to fight it, but they also knew that the mark had a way of twisting even the purest intentions.

Approaching him cautiously, Y/N reached out a hand and laid it gently on Dean's arm, feeling the heat of the mark beneath their touch. Dean looked up, his eyes clouded with anger and pain, but softening at the sight of Y/N's concerned expression.

"Dean, it's okay," Y/N whispered, their voice filled with love and understanding. "I know you're fighting a battle, but you don't have to fight it alone. We're here for you, no matter what."

Dean's gaze locked with Y/N's, the anger in his eyes slowly giving way to a glimmer of hope. But before he could respond, Sam entered the room, concern etched on his face.

"Dean, we need to talk about this. The mark, it's getting stronger and we need to figure out a way to control it," Sam said, his voice calm but firm.

Dean's jaw clenched even tighter, his anger bubbling to the surface. "I don't need your help, Sam. I can handle this on my own," he snapped, his tone laced with a hint of aggression.

Y/N stepped in, trying to calm the tension. "Dean, we just want to help. We're on your side, remember?"

But Dean's temper flared and he lashed out, his words cutting like a knife. "I said I don't need your help, Y/N! Just leave me alone!" he shouted, his eyes blazing with a fiery intensity.

Y/N flinched at the harsh tone, hurt flashing across their face. But beneath the anger, they could see the pain and fear in Dean's eyes.

Taking a deep breath to calm themselves, Y/N stood their ground. "Dean, we're not going to give up on you. We'll find a way to control the mark, together. “