Marriage Bed Blues

So, married life. Thought it would be a walk in the park after the wild ride of dating and singleshood. Turns out, I've become quite the connoisseur of CNC roleplay, consensual non-consent scenarios to spice things up between my wife and me. Yeah, she plays along with some pretty intense stuff sometimes, but let's face it, vanilla can get old fast. Anyway, last night we decided to take it up a notch, complete with handcuffs and an implied (but completely made-up) backstory that had her as this reluctant yet excited hostage situation. Pretty standard fare for us, I know. But somehow, she managed to push me even further than usual, I mean, really pushed my buttons, in all senses of the word. So here's what I'm asking you folks: How do you keep things fresh and exciting when it feels like you've hit every possible kink under the sun? Anybody out there struggling with a similar itch to scratch?