A Pawful Of Mischief (слэш)

Loki accidentally turns himself into a cat with a backfired spell and is on the streets of Midgard with nowhere to go.
Steve finds the black kitten on his way home after a run and Loki takes his chances, sucking up to Steve and giving him the big green eyes until Steve decides to take him back to the Tower where he gives the kitten to Tony to take care of.
However, Tony has a secret of severe depression that he's keeping from the others. Loki finds out by accident and seeks to help the genius. But in doing so, well...
...kitty chaos ensues.