It's pretty clear, from the way the latest chapters have been written, that Ivy is a second half of game or late game sexual partner, as far as Ian is concerned. A deliberately hard-to-get character for the male protagonist.
That wouldnt be a problem under normal circumstances... Look at Jessica, shes a late game sexual partner that up until now hasnt gotten a lot of content so we are just starting getting to know her
However, Eva has been teasing us with Ivy since chapter 1 and it took Ian until chapter 10 to just touch Ivy

...Of course only Ivy could have a scene with Ian that had a head between her legs, mounting and some rough choking and still wasnt sex


. Maybe now with the peoplegram swap we Ivy fans can get something
Shes not being "hard to get", she just hasnt had a chance to get some action with Ian yet

... Hard to get for Ian would be Louise
(at least before the last chapter where she just accepted a 3some out of nowhere 

)