archiveofourown.org/works/924682...
ROTTMNT: Retired Leo AU
Invasion of the Dinosaurs Part 6
With Casey badly injured, April and Cassandra try to get back to the lair.
#riseoftheteenagemutantninjaturtles #riseofthetmnt #rottmnt #rottmntfanfiction #retiredleau #futureleonardo #caseyjonesjunior