My friend, Shuri, who said, "I'm thinking of taking revenge," calls a bookmarker who was a classmate to the hotel. She threatens the past "Uri" with a story, silences her disliked with a slap, and sprinkles with cunnilingus and fingering. The butt of a pure white bookmark is swelled by being hit with a whip, and when the butt hole begins to squeak like a baby's sobbing by inserting two vibes, the feeling of the bookmark changes with repeated pleasure and despair.