"Twenty-Five Years After"
is a quite rare (for my writing) M/F story, a classic role reversal
in which a much younger, entirely 'toppish' woman asks for a serious birthday spanking from an overwhelmingly 'bottomish' middle-aged male relative, one whom she's already spanked very soundly herself on numerous occasions.
It's written pretty much in the second person (the young-adult female describing the situation from what she figures is the man's perspective), focusing mostly on their motivations and reactions leading up to the bare-bottom blistering at the end.
Yes, perhaps that sounds rather weird, it was a bit strange to write as well.
Generally, when my characters desire to be spanked (usually males by females), they're manipulative about it rather than being straightforward...