They stood there in silence. The only noise from the beginnings of rain outside. Castiel was looking at the floor, almost in shame. Dean stared at Cas, brooding with pursed lips.
Cas broke the silence first.
"I… um" he squinted, without looking at Dean.
There was another silence, this time broken by Dean.
"You could have just told me through Glen." said Dean, refusing to make eye contact by fixing the contents of his bag.
"Told you what?"
"That you didn't want to… be with me. I would have understood."
Castiel squinted again, this time directly at Dean, even tough Dean wasn't looking at him.
"I… I do" said Cas in a deep voice.
"Don't lie. That's why you weren't here."
"No Dean. I…"
"And how come you're apparating places? You haven't passed your test yet!" Dean blurted
"Dean, I just…"
"No, you know what? You should have talked to me sooner. It's been four god dam days, Cas! You can't just do that! You need to say something!"
Cas was squinting at the ground with his mouth hanging open
"Well?..." Dean waited for Cas to reply, but it didn't come. Dean jutted out his lower jaw and tilted his head back to look at the roof to hide his emotions from Cas, and started to blink rapidly. After a minute of silence, Dean continued, "Going to say anything?"
Castiel inhaled as if to start speaking, but never did.
Dean sighed, "Goodnight Cas." He half whispered as he threw his bag onto his shoulder.
As Dean turned away ad headed for the door, Castiel broke his silence.
"I can't tell you!"
Dean froze near the doorway. "What?" he said.
"I can't tell you where I was. I want to. I can't. I'm not allowed."
Dean's heart pumped hard in his ears, and a tang of annoyance arose in his lower stomach. "Can you at least tell me one thing." He said, taking a few steps towards Castiel.
"Depends on what it is."
Dean ignored Cas' statement and continued, "Why are you apparating? And how are you doing it here, at Hogwarts?"
There was a moment of silence then Cas said "I wasn't apparating Dean." His voice reverberated throughout the empty library for the silence that followed.
Dean thought about replying with a snarky comment, or just all out calling him a liar, and for a split-second, Dean almost believed Cas, but how else could he have been getting around like that? So, Dean, through his conflicting thoughts, chose the option that he could see that lead to the least amount of crying for him. Without a word, Dean turned his back to Castiel, and walked out of the library, leaving the stunned Cas alone in the library.
The further Dean walked, the harder it was for him not to look back, so he began to jog when he was halfway to the Common Room, then started to sprint through the corridors, with tears running down his face.
Dean's mind was still conflicted. He wanted to go back and make other choices. Say other things. Stay with Cas. But it was too late now. He burst into his Dormitory and collapsed onto his bed, still with his bag on.
And through the nights, the other boys could hear his muffled sobs echo throughout the Dormitory.