While Michael's wooing of Kay may have been bloodless, passionless, I don't think he gave any BS to her.
I reckon it was one of the very few, perhaps the only time he was honest with her, truly believing in what he was saying
Honest with her?? Believing in what he was saying?? "The Corleone family will be completely legitimate in five years"?? The family under Michael wouldn't be "legitimate" in five, or seven, or any years, except in Michael's warped, twisted way of imagining "legitimacy.". Try to count all the killings he ordered, even after he moved to Nevada. Even in 1979, decades after he married Kay, he still controlled the Commission, and was ordering murders right up to the end.
