Oh, no one has replied to this yet.
Well me being me I of course saw the “other” thing first.
You either see a person with a book in hand, one leg over the other or you don´t see any legs and the pages of the book are hair and the legs another body. So you have one person go down on another. However I admit it still is a bit wrong because I still see a cover of a book in both “versions”. Why he would wrap a dusk jacket around her head while she is doing it has to be the second biggest mystery after his disinterested facial expression.