Give me the plot of a lesbian novel about a girl discretly catches her best friend in the bathroom grabbing one of her dirty panties from her dirty laundry, sniffing it hard while pressing it against her face, then putting it in her pocket. The girl rushes back in her bedroom and when the best friend is back in the room, she takes leave of the girl to go home. The best friend is secretly in love with the girl and loves all the dirty stuff from the girl, as the strong smell of her dirty panties smelling a mix of her pussy and pee.