For Shadows-light91 . . . who suggested this bunny. It took me awhile but I finally got it written!
Holmes and Watson kept their faces schooled in carefully neutral expressions. The situation was precarious, with a lady's honor at stake. The barest hint that anything was amiss could be disatrous.
The lady herself, white-haired and amiable, continued to chatter on without any indication she noticed the situation. Fortunately Holmes was able to give her answers immediately that were satifactory if uttered nasally, and she departed in good spirits.
It was then that they rushed to throw open the windows and clear the room of the silent but noxious protest the lady's digestive tract had made.