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Artist's commentary
Satori-sama found the books hidden under the bed.
Books found: lots of cowgirl position ones
A young-looking girl in the cowgirl position is the best.
She probably already knows about the treasured books hidden under the bed and in the closet; she ventured to stay quiet about them.
Then she thinks "I want to drive you to the ground today, both physically and mentally", smiling as she does so.
Hijiri's case: post #1573479