These pictures are darling, and reminded me of something cats do, called "flemming" - using their Jakobsen's organ, or "vomer-nasal organ," located behind their upper front teeth - a little button of a thing you can see if your cat lets you have a peek. Most vertebrates have this extra sense, which we humans don't have - but if you have noticed your cat looking a bit like she/he is about to sneeze, and looking abstracted, while investigating an interesting animal or sometimes human scent, the cat is probably flemming.