Ms. Hammer Critic
Experienced
So...the idea of the anti-size-queen story was sort of an aggressive size doesn't matter approach. Less biggus dickus, more "let me show you how I can use this thing."
But it's not exactly a lot to build a plot around, y'know?
This puts me in mind of this one guy who kept surfacing in anecdotes about The Catacombs, a fisting club from the SF bathhouse heyday. He was missing a hand, so his arm just tapered to a soft point. Extremely popular with newbies. For a while, it felt like every book I opened which touched on The Catacombs lovingly discussed that guy. There's probably a bunch of stories about him, or people inspired by him, which I never tracked down.
I can see a handful of ways to hook a plot on the aggressively skilled, but seemingly unremarkable individual. "You'd never know it, but" is an amazing springboard.