This story is a sequel to Mistakes were made
With the local human having ceased wandering and causing ruckus he attempts - with Twilight's ever-patient assistance - to calm down, make it up to those that he needs to make it up to and generally live his best his life.
His greatest obstacle in this, as with most things post-arrival, is his towering neurosis.
And maybe the uncomfortable fact that he can't stop growing larger and more resilient with each passing day. And that not being belligerent to the wildlife gives him sufficient time to fully contemplate the breadth of his situation as a lone and isolated example of his kind in a world entirely not his own, try as he might to just ignore it and stop his brain from eating itself with irritating doubts and fears.
Other than that he's having a whale of a time.