Not even going to offer to slip a rubber on, huh Dean? You're lucky Cas wouldn't think about it, so you get it bareback. Hopefully Dean hasn't acquired anything nasty in the dozens of places he's put his penis.

Unfortunately, knowing where all of Dean's erogenous zones doesn't exactly wise Cas up to how to give a proper blowjob, so he's going into this completely blind. As a result, he at first just decides to just stick Dean in his mouth and see what happens. Dean gets a touch of teeth. What am blowjob technique.