The rationale for the spanking was reasonable.
Cindy had been out driving, and she gets a little overwhelmed at times when driving. She then stopped for groceries, and had them all in one bag when she entered the house. I had been working on our finances, and had music playing, such that I did not hear her come into the house. Tax season has come and gone, so re-arranging our finances is always worthwhile to do.
Cindy berated me for not meeting her at the door, but I explained that I was not in the room where I normally hear the garage open. Cindy berated me for not helping her with the heavy bag, and I countered that since my heart attack, I am not supposed to lift heavy items, so always distribute things in two or more bags and make extra trips.
I was a little perturbed, as Cindy somewhat stormed off. I put the groceries away.
A little while later, I was still upset, and went and spoke with Cindy. In the conversation I reminded Cindy that she can spank me at any time, without any reason, but behaving badly to me means she should be spanked. She didn't immediately object, so I asked her to stand up, and immediately starting undoing her pants, without her objecting, and then taking her panties down.
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Later, Cindy had slightly reverted to an angry mood, and I quickly repeated the spanking... slowly unbuttoning and lowering her jeans, then her panties, and bending her over, gave her five sharp spanks....
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Consensual Spanking works.