Is my wife into it?

So to be completely honest, I don’t see my wife being into it. But i just found out shes been reading a series of cuckold books. I made fun of her a little bit about it, just in a fun way so she was all giggly and what not. Then when she came to bed we had pretty amazing sex, like def top 3 times for sure. I even for the very first time, put my thumb in her butt while banging her doggy style. Shes never liked the idea of any butt stuff, and idk why i even did it. Guess i wanted to see if she pulled away or resisted and she 100% went with it… She did one time bring up the eiffel tower position but it was more of mentioning it not asking in any way. At the time i was surprised she even knew of such a position, but we were with friends and drunk so i never thought more of it. Now all of these little signs are starting to maybe add up? Looking for women opinions more on this matter, is she maybe into it or is it just fantasy for her?