以我桂花约写你香如故
[yĭ wŏ guì huā yuē xiĕ nĭ xiāng rú gù]
In this context, 'osmanthus' often signifies something delicate and beautiful. This user name conveys the message that the user will always remember someone for their original fragrance like osmanthus as though writing about them using the osmanthus flowers. It is poetic, expressing the constancy of beauty or love in someone’s memory.