40 more chapters till they confess and start dating.
40 more chapters after that for dropping to the knee and getting engaged.
Probably 40 chapters after that of the wedding preparations.
40 more chapters after that of the newly-weds life, the honeymoon/stuff.
Then the first kid, and maybe other stuff.
And of course, continuing the absolute cinema, the trio of readers personifications, will somehow magically find themselves always near them.
Well maybe without watching them younglings fucking, that would be to weird, at least till we wont learn they are extremely horny teenagers and let themselves go in a public setting like a onsen or something where the trio could "witness" them.