The sound of a turning door lock resonated through the room as Mu Qing returned, her hobbling figure making Zhang Ziwen feel a twinge of guilt. A flushed Mu Qing flung the items she had bought in front of him. On spotting a wet patch on his trousers, Zhang Ziwen's face reddened with embarrassment; realizing that she had noticed it earlier doubled his mortification. Peering into his trousers, he saw new underwear still in its unopened packaging – adding yet another layer to his humiliation.