The Day I Had to Spank Her for Breaking Rules She Made Up Herself

I'm a Daddy in my late 40s who has been married for over two decades now. We've always had an unconventional relationship, but it's never crossed into anything illegal or abusive. About six months ago, we decided to explore the dynamic of her being a little girl and me as her strict daddy figure, something she's always dreamed about even before marriage. She made up these rules for herself, mostly about curfews and behavior expectations that align with our playful roles. For example, if she missed curfew by more than 10 minutes or lied to me about where she was, there would be consequences according to the 'rules' she created. I didn't have a problem with it because everything was consensual and written down. However, last week something happened that pushed things too far. She had been out at night running some personal errands and got caught up in them longer than expected. This was her third time breaking the curfew rule she herself set, and I had already given her a verbal warning twice before. We agreed on one more slip-up would result in physical discipline as per our established rules. I waited until we were alone for the night to address it. She knew what was coming when I closed my study door behind us. Our bedroom is downstairs but this room offers privacy and security from any interruptions. She pleaded with me, trying to talk her way out of punishment or at least get a milder one. But she'd crossed the line yet again and needed to face the consequences. I took her over my lap as per our arrangement when discipline is necessary, feeling the firmness in my own thigh while she squirmed beneath me. Her clothes were already off, just as agreed beforehand so there wouldn't be any delays or resistance. I used a belt to administer the spanking because it was what we'd decided would convey the severity without causing lasting harm. She cried out and tried to fight back at first but then she calmed down once she understood this wasn't about me being angry at her personally, just enforcing our agreed-upon rules for the little girl roleplay. Afterward, when it was over, we talked through how much this meant to both of us, that she respected my authority in these scenarios as her daddy figure and that we were still a happily married couple. This isn't something we'll do every day or even often, but having that level of trust built up between us is incredibly meaningful. I just wanted to confess the truth about what happened without sugarcoating it because honesty matters so much in these dynamics.