Welp okay! Cas is perfectly fine with straddling Dean's lap, although he's not quite brave enough to just sit right on his dick there just yet. Because he's more kneeling than he is sitting Cas has a height advantage, Dean's hand on the back of his neck keeping him in place. The kiss becomes a full-blown makeout session, the sounds of panting breaths and the wet suction of lips parting making Cas's stomach pull tight. His hands grip either side of Dean's head, fingertips splayed across his neck, one thumb against his ear, misplaced in his hurry. Absolutely everything is running on automatic.