I would call this series How to Discreetly Show Interest in a Gentleman on the Omnibus.
The cute series starts out quite innocently…and ends with the sure promise of a second meeting. I am missing #5 of the 6 postcards though. I wish I had it! But the story is quite simple, really, and the person who sent these postcards could not resist putting words into the gentleman’s head!
So I added what she’s thinking before the translated comments.
Both models were sitting on chairs, with the design of the omnibus line added later. The third has a misspelling too! But the line did exist, and if you’re curious to see what omnibus these two would have been on, here’s an image of the Madeleine-Bastille line omnibus of the era: