So i just wanted to preface and say that I found this idea on tumblr and thought i might expand on it a little. Basically it's a head canon that Castiel can only see a few colors like washed out blue, grey, white and black, and the Winchester boys make him some special holy fire burned glasses to let him see colors. So yeah, here we go. (it's not very good.)

Rating: PG-13, minor sexual scenes

Dean woke up to see Castiel staring at him. "Jesus, Cas," he said, sitting up. "Stop watching me sleep."

He looked again and saw large black wings behind the angel, as well as a bright blue halo behind his head, giving off a not-quite-blinding glow. Castiel canted his head to one side. "Why are you wearing glasses, Dean?"

Dean noticed the black frames at the edges of his vision and took them off. He held them in his lap and looked back up at the angel, wings and halo now gone. He looked like a normal man again. "I needed them to see hellhounds. Forgot to take them off when I went to sleep."

Castiel nodded in understanding. "How did you get a pair of ordinary glasses to help you see hellhounds?"

Dean chuckled and handed the frames to the angel. "Sam and I burned the lenses with holy fire. It lets you see all kinds of things."

He stepped closer to Castiel, reaching a hand out to where he had seen the wings moments before, but finding nothing but air. He was sort of disappointed, but backed away. "Interesting," Castiel said simply. "I can already see Hellhounds. I wonder how the glasses would affect me."

"You see stuff like that all the time?" Dean asked, feeling a little awed. "Hellhounds and demon faces?"

"Yes," Cas nodded. "Along with human souls, angel wings, and Reapers."

Dean stood and watched Castiel for a moment. "You can see my soul?" He opened his arms and looked down at himself.

"Yes."

"Weird," Dean commented absentmindedly. He turned away to grab a beer from the fridge when a gasp from behind startled him. "What is it?" He whipped back around.

Castiel was close, wearing the glasses, grasping at the fabric of Dean's green button up, looking at it with a severe intensity. "I've never seen this color before," He looked up at Dean and started to ask, "What is it?" But he paused and stared into Dean's eyes instead.

Dean glanced away nervously, and asked quietly, "What?"

"Your eyes," Castiel said, frozen in place by the view. "They're such an intense color — I never noticed before. I thought they were silver. Instead they're..."

"Green," Dean supplied the color name. "How do you not know what green looks like?"

"I assume it's because it doesn't matter what colors angels see," Castiel glanced around the room, looking for more new colors. "But is it strange."

"Shouldn't you have a headache?" Dean asked. "Like when someone wears contacts and glasses at the same time?"

"I don't think so," Castiel replied. His eyes found their way back to Dean's and he stared. "They're so beautiful, Dean."

Dean flushed a little, because his Cas was so close and staring him down like he was the most interesting thing in the world to look at. Castiel even raised a hand and touched Dean's cheek, and followed Dean when he backed away. "Cas," Dean hissed. "You're too close, man."

Then Castiel blinked and stepped back, letting go of Dean's shirt and pulling his hand away. "I'm sorry," he had trouble tearing his eyes from Dean, but when he did, he closed them and took the glasses off. 

Dean was sort of bewildered, as Castiel set the glasses on a table, and he started to say something but then suddenly Cas was gone. He touched his cheek, when he was alone, because he could still feel Castiel's fingers there.

***

Dean was laying down in bed the next time he saw Castiel.

It was late at night, and the boys were leaving first thing. The glasses were still on the table. Sam was sitting up reading and listening to music, and he turned to look at Dean. "Hey, are you okay?" He asked. "Need help sleeping?"

Dean turned away, so his back was to his brother. "I'm fine," He grumbled.

"Alright, I won't pry," Sam threw his hands up in defeat. 

Dean touched his cheek again -- when Cas did it, his skin had tingled. He realized how freaking girly he was being and closed his eyes to go to sleep. It came faster than he was expecting, and he dreamt about green rolling hills dotted with wildflowers and a tall, cloudless blue sky. 

"It's peaceful here," Dean turned to see Castiel by his side, wearing the glasses. "And so beautiful." Castiel didn't dare to turn to look at Dean though -- his eyes were too damn mesmerizing and he feared he'd make Dean uncomfortable again. 

Dean was only uncomfortable because he stop thinking about how Castiel wasn't close enough. "Cas--"

He took off the glasses and met Dean's lackluster, silvery eyes. "I'm sorry for yesterday," He interrupted. "I forgot about the personal space rules."

Dean took the three steps that were between them so they were face to face. "You know," He said, taking one of Castiel's hands in his, "I don't think I mind." He was trying to be smooth, but on the inside he was panicking. 

Castiel stared back into Dean's eyes. "You don't?" Dean shook his head and Castiel linked their fingers together. 

And then Dean was awake and he was standing next to a beach, holding Castiel's hand and watching the sun set over the horizon. The sky was a beautiful mixture of peachy reds and oranges, cotton candy pinks and blues, and a brilliant fiery orange sun was half covered by the horizon, and the water reflected it all back up to look like an impressionist painting.

Dean looked over at Castiel, who was wearing the glasses again. "Cas?" He asked quietly. The angel had two trails of tears falling down his face, and Dean could see the sky reflected in the lenses. "Are you okay?"

Castiel kept his eyes on the view, and sunk down to sit in the sand. He tugged on Dean's arm to get him to sit, too, so they were side by side. "Yes, Dean," He wiped at his eyes one at a time, so at least one was always looking at the sky. "I'm doing great."

Dean chuckled and wiped a tear from Castiel's chin, earning his eye contact finally. He looked at his angel, with blue eyes and messy black hair and now those glasses and a beautiful golden glow that lit up half his face. Dean's hand stayed on the darker side and his lips parted in a faint surprise. "Damn," He said under his breath.

Castiel's lips turned into a small smile and he stared at Dean's eyes, a beautiful candy apple green, especially with the golden glow on his skin -- to Castiel he looked like he could be a god. Castiel's hand reached up and touched that cheek again, and this time Dean didn't back away, instead he leaned into the touch. Castiel's thumb rested just below the corner of Dean's mouth, and his eyes moved to those lips. "Dean," he said quietly, everything around him all but gone, the colors and the water and the smell of the ocean and the sand, all he could was Dean's warmth on his fingertips, and all he could see were those lips. He asked a question he'd never thought he, and angel of the Lord, would ever ask a human. "Can I kiss you?"

Dean was frozen, not in fear but in something else, and he nodded ever so slightly. 

And then Castiel was closer than he'd ever been and he pressed their lips together and Dean held him and actually kissed back, even though this was another man, and a literal real life angel. Dean turned his head so their noses wouldn't be slammed together and parted his lips slightly.

Castiel was not very experienced when it came to kissing, but he was suddenly eager to learn. He kept his one hand on Dean's cheek, and the other was resting on the sand, slowly clenching into a fist. Dean lifted the glasses with closed eyes, and Castiel closed his eyes because he realized that was what he was supposed to do, and Dean shifted his legs so Castiel was half sitting, half laying between them. 

Dean surprised himself, he thought kissing always had to go somewhere but this -- this was special. Castiel was soft and warm and tasted sweet, and Dean kissed from the corners to the center of Castiel's lips, feeling every part. It was intoxicating, he found that the more he tasted, the more he didn't want to stop.

But he pulled away when he couldn't breathe anymore and he was leaning so far back that he thought he might fall over. He put a hand behind him to prop himself up, and Castiel was still pressing forward, kissing Dean's cheek instead. "Cas," He said quietly, leaning further back so Cas couldn't follow. "I need a second."

Castiel pulled away with narrowed eyes. He touched his lips lightly with his fingers, and looked back at the sunset. "My apologies," He moved to unwrap Dean's legs from his waist, but Dean stopped him. Castiel made a frustrated noise. "I don't understand," He gestured to Dean's legs. "What do you want me to do?"

Dean chuckled lightly, but stopped when he saw that Castiel was genuinely upset. "I like kissing you," He said, much to his surprise. "I just need air, you know? Unless you want me to pass out on top of you."

"Who said you'd be on top?" Castiel made a smug expression, then his face turned red as he realized what that sounded like. 

Dean raised his eyebrows, and smiled. He leaned in close to Castiel, so far that Castiel was laying all the way down in the sand and Dean was straddling him, their faces mere centimeters apart. "Do you want to test it out?" Dean was just messing with the angel, but then suddenly they were kissing again and Castiel pulled Dean down to him with both arms.

***

The angel did not lose his virginity on a beach.

It was a week or so later, when he caught Dean watching a video with lewd sounds. Castiel didn't know exactly what the video was -- Dean had closed the laptop before he could see -- and when Castiel asked, Dean covered his lap with a pillow and said, "It's nothing, Cas."

"Dean, why are you hiding from me?" Castiel sat down next to Dean and looked at the pillow, then back up to Dean. He let his expression show his concern.

He noticed Dean was red in the face with nervous eyes and dilated pupils. "I'm not, it's just--" He looked Cas over and forced himself to look away. "I don't think you're ready for this stuff yet."

Castiel frowned. "You should let me decide that," He said firmly, but not unkind. 

Dean rolled his eyes. "Don't say I didn't warn you," Then he moved the pillow, and took Castiel's hand. "You're sure you want to do this?"

"Yes," Castiel replied, eyeing the protrusion in Dean's lap. 

"Okay," Dean said, still a little uncertain, but when he leaned in to kiss Castiel the uneasiness melted away. Castiel kissed back immediately, and Dean went a little further, dipping his tongue into the angel's mouth. The angel made a sound of surprise, and Dean pulled away. "Are you okay?"

Castiel nodded quickly, "I like that," he said so innocently. "Do it again." 

Dean kissed the angel, putting his tongue into his mouth again, and when Castiel was very receptive, kissing back fervently and even holding Dean's back with his hands, Dean put his palm between Castiel's legs. Castiel immediately pulled away from the kiss and made a low, surprised noise. "Dean," Castiel breathed the name.

"Do you like this, too?" He moved his hand gently, teasing. 

"Very much so," Castiel nodded and kissed Dean again. They stood and kissed their way to a bed where clothes were peeled off. 

Dean kept going, slowly, and experimentally touched and kissed Castiel. He found that if Castiel liked something, he wouldn't say anything, and if he didn't like something, he made a sound of alarm or pushed Dean's hands away. Dean was considerate and gentle, kissing Castiel all over and giving so much more than he took. Castiel was louder than Dean expected, but he couldn't find it in him to mind. He was just glad the angel was enjoying himself. 

When it was over and they were laying side by side, Dean found Castiel speechless. He was staring at the ceiling with blank blue eyes and a relaxed mouth. Dean turned the angel's head so they were looking at each other. "How was that, Cas?"

Castiel licked his lips very lightly and looked into Dean's eyes. His face broke into a small smile and he said, "I guess this means the personal space rules are null and void."

Dean laughed. "I guess so," And he kissed Castiel again, just because he could.

So that was kinda short, and a little spicy. I hope you enjoyed, and if you have any requests or ideas, feel free to comment below and I will write a one shot for it. Thanks for reading.