Between quiet bookshelves in cheeks underwear, she hikes her skirt and leans against the stacks. Fingers slip under cotton panties, rubbing swollen lips while whispering “Shh… cheeks underwear”. The danger makes her wetter; she bites back screams of “cheeks underwear” as she comes standing up, juices running down her thighs in the silent thrill of secret “cheeks underwear”.