Eloquently speaking promises you intend to break as soon as she's got her guard down, you sweep her off of her dainty feet.
My, what a big man you are.
It's fun to trick the princess because you're the dragon in disguise, damsels in distress dig your shiny see-through lies.
My, but you are my shining star.
And when at last they see, it's too late - they've met their fate. It's ever after alright but the happily has fled. Most likely she'll meet a timely end leaving you free to stalk your next prey.
My, what a handsome prince you are.