Camouflage

It took a little while to realize that he had perfected an elaborate camouflage to cover up one of the kindest and most generous of hearts. Even so, he was no soft touch and before you were allowed to peek beneath the surface and catch a glimpse of the real man, you had to prove yourself. Above all, you had to demonstrate conclusively to his satisfaction that you were no phony.

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Edit: The others are here or here