I was just looking for nursery rhymes books for my grandson (not yet 3 years old) and Kobo bookstore proposed me books like the one I was looking at (titled "Les p'tites comptines") and you'll never guess... it proposed my the whole "50 shades of Grey" series
I just hadn't figure they were :
1) for kids between 3 and 6
2) a nursery rhymes book (I think most people didn't understand their primary meaning
)