That’s How Heroes are Made (джен)

“Did you take a hit?”
“No, I’m fine.” Shoving himself up off the sun-kissed pavement proved a harder feat this time around. “It just flares up sometimes. But I’m up. I’m—”
A cry escaped his lips before he could stop it as the ground came crashing toward him again.
“What flares up?” Stark’s voice had lost all its humor.
Loki clenched his jaw until his muscles screamed in protest. “My ankle.”
 
When the Avengers take Loki in after the destruction of New York, things seem to be going well (or, as well as they can be, considering the circumstances). However, when a previous injury decides to rear its ugly head again, Loki is forced to reconcile himself with a but more than a swelling ankle.
An Avengers AU. Written for Whumptober 2021, prompt no. 10: Flare-up.