(prompt: HS!AU Cas had a wet dream about his best friend Dean)
Cas has been avoiding Dean now for four days, three hours, and fifty-six minutes - not that Dean’s counting. And Dean has no idea what he did wrong this time. Everything was going great, actually. Dean and Cas had been hanging out more and more. Every night they’d do homework and then watch television together or talk. Dean’s heart had been doing back flips of happiness; he has had the biggest crush on Cas since they started high school.
But one morning, Dean came to school and found Cas at his locker as per usual. Cas looked at him, paled, and ran away without one word. When Dean tried later it was the same, just like every time since for the past four days. Now Friday, Dean really wants to find out what he did wrong before the weekend. They are supposed to go to see a movie. Dean wants to apologize in time to keep his plans.
Dean waits until Chemistry, where Cas can’t escape, then leans over and whispers, “Did I do something?” Cas’s face turns red, maybe in anger, but he doesn’t say anything. “Why are you mad at me?”
"I’m not!" Cas says too loud and the teacher pauses the lecture a moment to glare at him. Cas shrinks down into his seat. When the lecture begins again, he turns to Dean and says, softer, "I’m not."
"Then why are you avoiding me?"
Cas shakes his head.
"Cas," Dean pleads. When Cas doesn’t answer, Dean turns to guessing. If Cas isn’t mad at him, then… what else could it be? The answer pops into Dean’s brain and he immediately wishes it hadn’t. "You’re seeing someone."