"Grandfather," Susan said thoughtfully, "how many times did you let me ride Binky as a small child?"

THAT WOULD HAVE UPSET YOUR PARENTS MORE THAN THE MY LITTLE BINKY DOLL, he replied, SO I COULDN'T POSSIBLY SAY.

"Of course not," Susan said smoothly, "because wanting to ride a horse would have been something normal, but wanting to ride your horse would not."

PRECISELY.