Gustave has taken it upon himself to observe Marion and Sanglain following the death of the Princess and DT.   But KT thinks Gustave is in the city of Marquesas for other reasons. 
Forgetting etiquette for now, 
will you tell me one more thing?
Olvidando la etiqueta por 
ahora, ¿me dirías algo más?
Olvidando un momento los modales, ¿podrías responderme a una cosa?
Esquecendo a etiqueta por um
momento, vai me dizer algo?