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Artist's commentary
Netolillie
Lillie => Doing Lillie well! => SLillieeping around.
These are puns on Lillie's name. "Netorare" is Japanese jargon for an affair, and L's and R's are interchangeable in Japan. It then says "GanbaLillie" instead of "Ganbare", or "doing your best", and "NetoLillie" again.