At least his eyes weren't black. Sam could get into a spiel about how he loved Dean's eyes... how they drew him in and captivated him and how those long lashes just did things to Sam's libido. And how he wanted to see said lashes dripping with his come. But the spiel could wait. After all, his tongue was busy.
"Pretty sure my dog never licked come off my face." Sleeping with his brother was one taboo, but going there with animals? That was one line he wouldn't be crossing... unless werewolves counted, in which case - been there, done that, got the t-shirt.
Once he had gotten every drop of come off of Dean's face, he leaned in to kiss him, hand slipping down between them to cup Dean's crotch.