Yes, I see him that way too... the "you've got heart" line... Also in some versions of the comics, he has kids (of course Nat offs them, but...nevermind 'bout that ;)...that's not cute, sweetie, awesome kickass Nat in the movies).

I'll have to add Castle to the list of shows to watch when I start watching tv again. I haven't really watched any tv shows for the past 3 years other than kiddie shows. :P