rollin:
Now I can believe that an 11 year old might want to play spanking games with others his age. Hell, lots of us actually did. or a game with a teenage babysitter. That probably happened too. But I think we drew the line at the real thing. The real thing was terrifying and something to be avoided at all costs. But in this story, it's even more. The implements come out---bathbrush, hairbrush. Whew!
Now the reason I'm talking about this is that I recently wrote something similar, and when I plotted it out, I figured I had to do a few things to make it believable. First, the boy had to be mid teens at least---post puberty and all raging hormones. Second, he had to have an obsessive, puppy-love type crush on the sitter. To me that was the only way it made sense. Past puberty, all bets are off when considering what males will do for a bit of a thrill. At 11, not so sure.
So my review is 2.5 stars. Hot if you can put yourself in the boy's place as a fantasy, but a bit hard to swallow.
Well, of course it's a fantasy.
As a shy eleven-year-old, I doubt that I'd even have had the nerve to manipulate a pretty teenaged babysitter into giving me a play spanking, with her palm mildly slapping the seat of my pants, to say nothing of maneuvering her into giving me a seriously punitive bare-bottom blistering with a wooden brush. (I never had such an opportunity anyway, due primarily to having younger siblings, but I'd likely have 'frozen' if such a chance had existed.)
So Josh is a much more courageous, and self-aware, preteen version of myself (and undoubtedly numerous other 'bottomish' male readers), he had a golden opportunity and was bold enough to exploit it all the way. Is he a realistic character? No more than Sir Galahad and Batman are realistic characters, but a reader can nonetheless appreciate their near-superhuman qualities and wish he were more like them.
Melissa is hardly a realistic character either. Even assuming that she was tricked once into giving Josh such a sound chastisement because she had deniability (his mother didn't mention spanking one way or another, so she could plausibly claim to have been duped by Josh) and felt strong 'toppish' desires, she continued to administer regular, pretty severe paddlings to him even after finding out that his mother didn't approve of spanking the boy--at least at that time. IMHO that was a big risk, counting on an eleven-year-old, even one who was gratified by his twice-a-day punishments from her, not to 'let it slip' about them to his mother later on. (Melissa couldn't have known that the mother would afterward alter her disciplinary approach to favor corporal correction of her son.)
She's the type of budding feminine disciplinarian that guys like me tend to fantasize about, determined to deliver those stinging whacks to our naked buttcheeks even if she has to take a personal risk to do so.
The story's author is John Benson, so IME one has to expect it to involve fantasy elements, even within a realistic setting.
As Februs noted, often fantasy/hyperbole can be more enjoyable than realism in a spanking-oriented story...

--C.K.