@JamzJamzJamz
Only that it isn't. There was no "subversion of our expectations" in how you put it, all that happened was that the mango said: "she had sex", and then it went ahead and completely ignored the subject and focused solely on the main couple's relationship.
Notice that most of the manga is about the main-guy fumbling about with his insecurities and awkward wants. Her past actions affect the story to an incredibly minor degree, to the point her "experience" is only rendered as a cheap topic of discussion, and as blatant click-bait.
Long story short, this is the last time I am commenting about her experience. It's as pointless as it ever was, and the author clearly used it as an incredibly cheap way to grab attention, which was not even necessary. This is a chill, easy to read, cutesy romance story about an awkward guy, who wants to know a kuudere better, who's hard to read.