Operatic duets

Sieglinde plays the role of "Fleming flapper" eagerly, and with absolute joy; La Cieca zealously plays hers. (I'll leave you to conjure creative names for it.) So no news, no surprises, let's move along ... to the the inaugural issue of Sieglinde's version of the *yawn* Regie quiz! Which opera would the following scene be, if it were an opera production in Paris or Dresden?