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Cas was kneeling in the bunker showers, jacket and trenchcoat off - just in his dress shirt and slacks. Practically naked.
Dean, on the other hand, was naked in a more literal sense, at least from the waist down. Too squeamish to stay dressed for tonight's program and regretting it a little - the tile was too cold against his bare feet.
Cas was watching him, palms braced on his thighs - waiting patiently for his prize.
And Dean was gonna give it to him.
Two six packs of beer, his bladder painfully full, his dick in his hand. He was ready. It was just- those damn blue eyes staring him down.
“Close your eyes, Cas.”
Cas just frowned.
“I can’t go with you watching me,” Dean explained.
Cas nodded and closed his eyes, anticipation still painfully visible from the way he held himself - leaning forward, stiff like a statue. Still, much less stressful this way. Dean sighed and let loose.
The stream started a little thin, but soon ran stronger, as Dean relaxed. It hit Cas in the chest, urine soaking into his white shirt, turning it translucent, sticking it to Cas’ skin, revealing dark hair and dusky nipples underneath. Cas gasped, clearly pleased and Dean cringed.
It was so gross. He couldn’t believe Cas wanted this shit…
Dean could never.
Would never.
And there was something heady about that. That Cas would let Dean do something like this to him. Dean sucked his lower lip into his mouth, bit down. He angled the stream upwards, towards Cas’ face, but then Cas opened his mouth and Dean clenched up in shock.
Cas frowned, opening his eyes when no more piss came his way. “Are you done?” He sounded disappointed.
“Uh, no.” Dean shuffled his feet, feeling his bladder protest, still too full. “Are you for real,” he mumbled.
Cas cocked his head.
“I mean,” Dean said louder. “You want that stuff in your mouth?”
“Please,” Cas sounded so pathetic. Dean’s dick twitched.
“Yeah, ok. Close your eyes again.”
Cas obeyed him. Closed his eyes and opened his mouth. Like a baby bird, kinda.
Dean shook his head and started pissing again - right into Cas’ mouth. Cas moaned in pleasure and took desperate gulps, trying to put it all away without spilling, face twisted in ecstasy. It was a futile battle - the piss spilled down his chin, dripping onto his wet shirt and slacks.
“Fuck,” Dean groaned. He was starting to get hard, wondering what else Cas would let him do, before it got too much. If there even was “too much”.
He angled his dick up and hit Cas between the eyes - he didn’t flinch, to Dean’s disappointment, just moved his head, trying to catch Dean’s piss, going by feel. Dean let him chase the stream around - getting it in Cas’ hair, and all over his face, the urine clumping his eyelashes together - plastering the hair to his forehead.
Cas looked completely debauched - it turned Dean’s stomach, but at the same time, he couldn’t look away.
He let Cas drink a little more, as the stream thinned, until it stopped.
Cas sighed and knee walked himself closer. He reeked, but Dean let him - he was going to give them both a proper decontamination shower later anyway.
“Dean,” Cas pleaded, braced against Dean’s thigh, “can I get it in my mouth?”
“Have at it.”
Cas took Dean’s dick, half chubbed up, and licked the head, capturing the few remaining stray droplets, and then gently swallowed it down to the root, until his chin was resting against Dean’s balls. Not blowing him, just keeping Dean snug and warm. He sighed and hugged Dean’s legs, satisfied.
Dean watched him, kneeling at his feet. It was kind of unbelievable, that Cas was his. He pushed his fingers into the wet mess of Cas’ hair, scratching his scalp lightly. “You don’t get it, huh?” Cas didn’t respond, just pressed his face firmer into Dean’s soft belly. “You just… want stuff, because you want it. As simple as that.” Castiel just hummed in response, gently pressing his tongue against the underside of Dean’s dick.