"What? You've never celebrated Halloween before?" Dean sounded positively scandalised as he turned to face Castiel. His roommate shrugged apologetically, continuing to fiddle with the bowl of candy Dean had bought earlier in the day.
"My family never celebrated it. They thought the costumes were too devilish," he explained, voice calm and even as always. He watched Dean pace the room, unsure if he should be amused or worried with how offended his best friend was acting simply because he hadn't eaten a bunch of candy once a year as a kid.
"Well," Dean finally came to a standstill. "We are remedying that this year. Dude, we're gonna carve pumpkins and watch scary movies and eat junk food till we feel sick. Hell, let's get costumes even if we're not going trick or treating. I can be a demon and you can be, like, an angel or some shit."
Castiel's mouth twitched into a smile. He put the bowl of candy down and leaned back in his chair.
"Did you celebrate Halloween with your family lot, then?" he asked, feeling a happy warmth fill him when Dean's face lit up.
"Oh yeah! I went trick or treating with Sammy every year. We had the best outfits, man. Always matching," his face went slightly wistful, and he sat himself down beside Castiel, leaning onto the table between them.
"It'll be great this year too. You'll have so much fun, I swear," he gazed earnestly into Castiel's eyes, and Castiel found himself glancing away from the intense eye contact.
"I never said otherwise, Dean. Of course I believe it will be fun," he rumbled, leaning forward then to nudge Dean lightly on the shoulder. Dean snorted and slapped the hand away.
"We'll have to go get pumpkins later. And costumes, I guess. You're cool with being an angel, right?" Castiel hummed in agreement and went back to picking up and dropping candy back in the bowl. Dean went silent for a moment, smiling as he watched his roommate.
The companionable silence didn't last for long of course - Dean had never been very good at sitting quietly - and he reached forward to grab Castiel's hand. Blue eyes blinked owlishly at him for a moment, then the hand squeezed back.
They smiled at each other, then burst into laughter and leaned forward till their foreheads met.
"I can't wait till Halloween," Dean murmured once the giggles had calmed down. Castiel sighed in contentment.
"I can't wait either," he agreed.