Sam's hand slaps against the shelf, the sound echoing through the rows of books, as he bites at his lower lip, trying to stop the curse from escaping his lips.

Gabriel looks up from where he's kneeling, fingers curled around Sam's hip and breath ghosting over Sam's cock. He grins as he leans close, his mouth right there and still too far away. "Bet I can make you scream, Sammy-Boy," he murmurs, his tongue flicking out. "Bet I can make you beg--"

And Sam knows he can, he's done it before, so he closes his eyes as he feels Gabriel's lips move over his cock and wonders if they'll be done before the librarian finds them.