Correct, first and foremost we do not know whether that scene is true and if is, how they got there and how it will end. Moon can be mean enough to let Nana come to her senses at last moment as we know.

Considering the fact though Moon found it necessary to publish next update as a double update and did not want it broken up, we can assume that something will happen at end first update that according to Moon needs the second update to be close. Whether that is full blown sex with Nana or something else, Moon knows