I think of it as a girl's name, with nn "Tori" (although this doesn't apply to a mn) but it isnt so obviously girly it would be embarassing. I would go with Story instead of Storey to avoid misspellings every single time it is written out. Other whinsical names i can think of:
Ottilie usually has some good options, i would hope for her comment!
I do think Storey is better for a girl, but it could work as a boy's middle name. The problem I see is that the "st" in August blends into the "st" in Storey.
Story does sound a little too girly for me though it could work for a boy, some other 'whimsical' middles for boys you might consider......
Cavalier- word for a knight
Corsaire- French word for pirate
It sounds too much like a sentence to me. Sorry.
Yeah, I think the two names have a problem of blending into each other. August Storey can end up sounding like "August Tory." Since they're both words, the combination makes August sound like an adjective describing the noun "story," so like a story told in the month of August. I would try to avoid pairing another word name with August. I like each name on their own, I'm just not sure on the combination.