The thing was-- as pissed as he was, he couldn't really... show it or be that way. He knew, rationally, that Dean had to make a choice last night, Sam knew he'd been about dead from that thing, but...

That didn't stop him from being mortified that Dean would know how he was feeling, that he wouldn't have that distance there anymore.

And then he was telling him he was going to be-- "What?" He let out an awkward noise, something close to a chuckle in disbelief. "I'm going to-- dude, you're... you're my brother. No." He felt skeevy enough the times his body had reacted a little too eagerly to being bitten, he did not need... that in his head too.