He doesn't hide. Too undignified; this is his library after all and
that's his office Willow's sneaking into.
But he stands very still in the shadowed stacks.
He watches.
Watches and moves silently closer. Sees the lift of her breasts as her
arms are raised, sees her knuckles pale as she grips the heavy book.
Sees triumph make her face brighten and her eyes darken.
And times his cough perfectly so that she's able to fumble the book
back into place by the time he wanders in.
Let her wonder if he saw. Punishment enough.
Unless she does it again.