The Avengers: Lokitty Edition

Avengers AU where Loki escapes from the Chitauri and ends up on earth. Injured and exhausted, he disguises himself as a cat. And Steve has a thing for saving abandoned kittens. Then when The Other is sent to retrieve a couple stolen relics, Thanos has an army and a plan, and everyone thinks Thor is insane... (Protective!Thor, Protective!Avengers, BAMF!Loki, no pairings)