This was written for deon99's prompt on comment_fic on Live Journal. The prompt(s) were: SPN Sam/Dean, Eyes
Dean has always thought that Sam had beautiful eyes, hazel with a slight tint of the same green that makes up Dean's eyes and all throughout their lives, Sam's eyes have been beautiful
When they were kids, Sam's eyes had been full of innocence and hero worship when they focused on Dean. In those eyes, Dean was the hero, the all knowing big brother who could fix any problem, soothe any pain. In those eyes, Dean had been Superman, Batman, Spiderman and Wolverine combined and he'd never wanted to do anything to make Sam think he wasn't the hero he was in those eyes.
When puberty hit, Dean still remained the hero but now Sam's eyes saw him as flawed and misguided; too enthralled with obeying their father and his single-minded quest for justice. Too often, Dean had seen those eyes brimming with anger and frustration when their father broke another promise and Dean refused to take his side. Dean had hated the way he'd felt when those angry eyes had looked at him, hated feeling like he was losing a part of himself when Sam no longer saw him as a hero when Sam walked away after that final fight.
After Jessica died and Sam began having visions, his eyes were often too dull with exhaustion and/or pain to see Dean as a hero. Too often, Dean would see Sam's eyes clouded with pain from things that only he could see and feel like a failure because he couldn't be the hero and ride in to make it all better like he used to.
After he got yanked out of hell, the first thing Dean noticed was that Sam's eyes were different, a mirror to the changes that had happened to his brother while he was gone. Sam's eyes had always been his giveaway and Dean's window into his baby brother's often very complicated maze of a mind. But after he came back, Sam's eyes were closed off, wary, not willing to show the secrets that picked at their once close bond until it was tattered and torn. It took him months to realize just what it was that was shielding his brother's eyes from him and vowed to do whatever it took to make those eyes beautiful again.
And now, as he's clinging to his baby brother as he finishes detoxing from the demon blood he'd ingested to kill Lilith, Dean finds himself looking into Sam's eyes and is stunned to see those eyes staring up at him, bright and clear like a child's, depending on his brother to make the pain and hallucinations stop.
Yeah, Sam's always had beautiful eyes but right now, looking into those pain filled eyes, Dean can't remember another time they'd looked more beautiful, because it's Sammy looking to his hero to make the world right again and that's the look Dean loves best.