That day, almost 6 months ago, when Cas kissed Dean, Dean was not happy. He was pissed. He didn't think that liking guys was okay to do. He didn't think that him, of all people, could like guys.
Castiel proved him wrong though. The second that their lips started moving together, it was like a new, exciting emotion ran through Dean's body. He wasn't... totally mad about it. He still shoved Cas away, muttering something about how he's not like that, but in his mind, he knew he was. He just didn't want to admit it because 'that's wrong right?'
Cas didn't give up, though. Over the next three weeks, he'd get a little too close to Dean. 'Accidentally' brush his hand against the hunter's. He might've even slipped into his bedroom in the middle of the night, claiming he had a nightmare, and that he can't sleep just so Dean would let him sleep in there.
Since then, Dean's been slowly convincing himself that it is okay to like guys. That he does like guys. He likes Cas. He's known this from the beginning, back in 2009 when the angel showed up. He just never thought it was right to think like that, so he pushed it so far back in his mind that he almost forgot about his little crush.
Three months after the kiss, Dean caught Cas masturbating. He couldn't stop imagining it over and over again in his head. How Cas' eyes were screwed shut. How hot Cas looked as he was about to cum over his fist. How Cas' eyes went wide when he noticed Dean, but he didn't stop what he was doing.
Just a week after that, Cas asked to borrow Dean's laptop. Dean didn't think anything of it, until he checked his laptop history. Four separate tabs. All porn. All gay porn.
Dean gave Cas a lecture about how he needs to close out every tab he opens and how to open a private browser so it can't be traced back to his laptop. Cas nodded, acted like he understood, until Dean mentioned that he can't be looking at gay porn on his laptop.
Cas questioned Dean on this. He didn't understand why it was a problem. It was what he was into, so why couldn't he watch it?
Dean stormed off, red in the face, trying to stop thinking about how Cas was into gay porn. He just couldn't get it out of his mind no matter how hard he tried. He looked at the history and saw a link to pornhub. He clicked on it, his curiosity getting the best of him, and watched intently as two guys went at it for about twenty minutes.
Before he knew it, Dean was horny. He was watching gay porn and getting horny.
Another week passed of Dean looking through his pornhub history and seeing what Cas was watching. There was a lot of kinky shit in there, and Dean watched every video that Cas did. Every time, getting hard as he watched a poor guy being tied up and edged for an hour.
Dean went to Sam after that week and talked to him about Cas' interests. He asked him multiple times if angels could even be gay, but Sam's answer was always the same. "I mean, I guess so. Cas is."
Four and a half months into this whole deal, Dean let himself think however his mind wanted him to. It always came back to Cas, though. How he was watching gay porn. How hot he looked when he got off on it. He couldn't deny it anymore, he wasn't totally straight.
Dean went to Cas and let out all of his feelings on this. He thought it was wrong to be gay, his dad always told him that "fags aren't worth nothin' and they shouldn't be." Cas assured Dean that it's okay to be whoever he wants to be. It's okay to like guys, girls, and in between. That he did too, and he wasn't "worth nothin'."
Dean agreed with Cas. Cas wasn't worth nothing. He was worth everything and more. Dean would give up his life for the angel, that can't be nothing.
Two weeks later, Dean finally came to terms with the fact that he likes guys. That he's attracted to Cas. He went into Cas' room one day, expected him to tell Cas his feelings, but all that came out were cries. He felt guilty. He was guilty that he felt this way about guys. He didn't want to be different, he wanted to be like everyone else. He didn't want the added pressure of being different than his brother, than his father.

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Supernatural Oneshots (take 2)
Fanfiction⛔️CURRENTLY IN THE PROCESS OF REWRITING FROM THE BEGINNING. IF YOU WANT TO START THIS BOOK, I SUGGEST STARTING A GOOD WAY IN SO THAT THE CHAPTER YOU'RE READING DOESN'T GET SPONTANEOUSLY UNPUBLISHED WHEN I REWRITE IT!!! CURRENTLY 2/83 CHAPTERS HAVE B...