Fic: Keeping Her On Her Toes (B:tVS/Avengers; PG-13)

PG-13; B:tVS/Avengers; 1100 words. Challenge fic, from August 22; 6th in a series in progress.

Sometimes Buffy forgets he's been a soldier and spy longer than she's been the Slayer.

( Keeping Her On Her Toes )

(x-posted to twistedshorts and at AO3)