If you only pretend to take satisfaction in someone else's suffering, that's schadenfraud.

If you happen to be a young woman taking satisfaction in someone else's suffering, then you're a schadenfräulein.

If you take satisfaction in your mother's suffering, that's schadenfreud.

If you take an amphibian out of direct sunlight, that's a shaded frog.

If you take satisfaction in your own suffering, that's schadenmasochism.

If you only pretend to draw regions of varying darkness, that's shading fraud.

If you take satisfaction in robots suffering, that's schadendroid.

Bah humbug that's obvs called schadenbetrug.

You say you feel pleasure in their pain, but I see your empathy. Pathetic.