Pretty sure you have to be on Eve's sub path to finger her at that point.I noticed that game calls a check on day 3, whether you fingered/kissed/rejected your sister Eve.
Do you have any idea how to reach fingering scene in Ep2 ???
Ep2 is the night where MC and Eve and Cassie have Drink or Truth game.
PS: Also last updates were very disappointing. Almost no new noteworthy content.