MarkPhoenix:
This one occurred to me while I was looking through one of the Harry Potter books. The recipient -- Hermione. But who would be the one administering the spanking? The most obvious suspect would probably be Snape, but who do you think would be equally good choices?
Ahhhh well, Hermione Granger always struck me as far more 'toppish' than 'bottomish,' perhaps partly due to my F/M preference, although I've portrayed her in both roles in spanking fanfiction.
Other than Professor Snape, for M/F enthusiasts:
Ron Weasley--obviously, he's her boyfriend and he's going to end up marrying her;
Viktor Krum--he's her one-time romantic intertest, a strong, silent jock type, many female spanko-bottoms seem to fantasize about getting it from this type of guy;
Alastor "Mad-Eye" Moody (the real one)--he wouldn't take any gruff from a seeming know-it-all.
For F/F enthusiasts:
Professor Minerva McGonegall--as the head of Gryffindor House, she'd be the girl's school disciplinarian;
Molly Weasley--if she can discipline Fred and George, she could certainly wallop her future daughter-in-law's bare buns if necessary;
Pansy Parkinson--it would be a spiteful spanking from a Slytherin bully jealous of Hermione's academic stardom.
[I've always wondered if Pansy were somehow related to Harry Potter, his other female relatives have/had "flowery" names.]
This is my thinking on the subject anyway... --C.K.