Any stories where a girl/woman try to pass as a male. Please.
Gina Marie Wylie's The Cost Of Time has one MC having to disguise as a male to escape, but she's only one of a few threads in that story, the rest of which have MCs from her Tangent
ETA: GMW's Two Men and a Ship over on her beyondthefarhorizon site also fits.
It's a common SOL trope for a protagonist to rescue a child in need, thinking they're a boy, only to find out the child is actually an attractive, legal, girl.
AJ
Thanks for the memory nudge.
https://storiesonline.net/s/18324/split-tails-ranch
Supporting character is an underage girl passing as a boy to stay with her brothers. Not a pedo story, so she isn't part of any sexual activities.
I actually wrote one that involved that last year.
https://storiesonline.net/s/21941/wont-get-fooled-again