Pencil is way easier to "erase" than pen.
Leaving a Magic Eraser on a table within easy reach of children or animals is not a good idea.
Animals, like cats, think a Magic Eraser is food.
Eating a Magic Eraser makes a cat sick.
Cats don't like being thrown out of the house while yakking.
Cat puke isn't fun to clean up. Easy, but not fun.
Cats will puke for the few days following a Magic Eraser meal.
Lessons learned from observations: no writing utensils for kids; Magic Eraser is for Mom only. Obvious to most beforehand, obvious to others -me- only after the fact.