I looooove spanking. I like watching people getting spanked, I like getting spanked, and I like spanking others.
I think spanking goes incredibly well with diapers because they both involve your butt; so if you have someone willing to change you, spanking is already an option.
Diapers are also really easy to incorporate into spanking. For example, if you are feeling hardcore, you can dial down the padding and have a real rump roast with an alphabet soup of implements... Or for more sensual times, you can stay padded during a paddling so your spanking doesn't hurt as much.
Then, being put into a diaper after a spanking is probably one of the best things you can have happen, because having a poofy and toasty bottom is amazing.
I dream that I can find someone who likes diapers and spanking in the same ways I do... Someone that could pull me over their lap and smack my diapered bottom or vice versa...maybe even give a surprise smack or two during changes.
Spanking and diapers are my two main fetishes. It's really hard to say which I prefer.