History is Violent

Dean thinks they've been dating for years and they're just taking it slow by human standards because angels are literally older than time so it would actually be really fast in the grand scheme of Cas's life and he's super happy with their dates and emotional intimacy when they have the time, and simultaneously every time Cas even dares to have a romantic thought about Dean he throws himself into a life or death situation to escape both the force of his own emotions and also the instincts of his 'monstrous nature' which is being so angelically horny for Dean he thinks he's going insane, so Dean is living a soap opera style romcom with ups and downs and Cas is living a gothic horror where he is the monster who has lured the maiden in with false pretense and is struggling to not devour her