No, this is not the latest high-minded study of Vampirism by Gyatri Spivak or some such Ivy League charlatan. Just a little observation from reading a bit of Moonraker last night. Specifically, I read a section of this fine novel and it occurred to me that the famous finger-sucking scene in Casino Royale, so much beloved by our own tiffywint, was likely borrowed from Moonraker.
About midway through the piece, Bond and Gala Brand are walking along a beach together when she picks a flower. Bond makes up so much folderol about flowers having nervous systems and screaming when picked and that Gala is a murderer.
Gala's understandably skeptical, and responds, "I don't believe it. Anyway, I wouldn't have thought you were a person to get sentimental. Don't people in your section of the Service make a business of killing?"
Then, humoring bond, she unbends a bit, "Now you've made me feel like a murderer. It's very unkind of you. ... What am I going to do with this one [flower]? You make me feel like it's bleeding all over my hands."
Bond replies, "Give it to me. According to you, my hands are dripping with blood already. A little more won't hurt."
And there you have it. Bloodstained Bond, who's already guilty of all sorts of violence and horror, in a Christ-like act of sin-absorption, removes the blood and guilt from an innocent girl and takes it upon himself. She is absolved and relieved of a burden, while Bond is none the worse for having accrued still more guilt.
In short, the similarities here are striking enough that I'm reasonably sure the scene in CR was cadged from Moonraker and altered to fit the film.