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Castiel is used to the thin walls of his apartment, he's used to the way he can hear everything his neighbors are doing and he knows how to avoid being heard by his neighbors too.
His new neighbor in the apartment next to him either doesn't care that he can be heard through the walls or he doesn't know that he can be heard through the walls because every day Castiel can hear his new neighbor singing in the shower.
He always makes a mental note to tell his neighbor that he can hear him but he never remembers when he actually sees him. He hasn't gotten a chance to talk to him but he knows his name is Dean and that he loves classic rock.
He was in the middle of straightening up his bathroom, a few of his brothers were coming over today and he at least wanted the apartment to look somewhat decent when they showed up, when he heard the familiar sound of his neighbors voice. Today’s song was one Cas actually recognized, one of his favorites actually, and he didn’t even think about it when he loudly sang along to the next line of the song.
“Once I rose above the noise and confusion
Just to get a glimpse beyond the illusion
I was soaring ever higher, but I flew too high”
There's a sound from the other side of the wall that sounds like somebody slipping.
"Are...Are you okay?" Castiel shouts through the wall.
There's no response for a moment and Cas hopes he didn't make the poor guy slip and knock himself out.
"Yeah." The guy finally shouts back," I'm good."
“Sorry about that.”
“It’s fine, just scared the shit outta me.” is the response, and then after a moment, “So uh...how long have you been able to hear me?”
Cas can feel himself blushing and he's thankful that Dean can’t see him, “Oh, um…” he doesn’t want to admit he’s been able to hear him for weeks but he knows he can’t lie, it would be too obvious, “It's...been a while.”
Silence.
‘Great job Castiel, you freaked him out. He probably thinks you’re some creepy guy who listens to strangers in the shower.’ Before he can think on it anymore there’s a knock on his door. He almost wants to stay in the bathroom in case Dean tries to talk back again but he decides that that would be creepy and heads out to answer the door.
He opens the door to see a man he’d never met before, he definitely would’ve remembered him. He was wearing jeans and a dark t-shirt and he had the most gorgeous green eyes Castiel had ever seen.
The man chuckles, “Are you gonna stare all day?”
Cas snaps out of the trance he hadn’t noticed he’d been in, he recognized that voice.
“Hello.” He says.
“Hey.” Dean says with a grin, “I figured I should at least get a look at the guy who’s been listening to me in the shower for ‘a while’. Name’s Dean.”