@Raven-Honch Masahi can still for a rare occasion decided to see aki to confess her feelings and also why not trigger a huge jealous rage in sensei ^^ of the answer of this one she will definitely leave him alone or not, to focus on her serialization. The best would be for masahi to tell it directly to makoto by saying that she decided by all means to take aki's virginity before her, that would be the best!
The last obstacle of the series, the last boss is obviously the husband. We know that makoto clings to this marriage more out of duty than out of love, we know her character, she is naive and easily submissive to have a "normal" life but she is totally bored. It could also be that her husband will trigger a reaction at home if he decides to move again for a job...
But she's also a naughty girl who loves to spend time with aki, she thinks about him more than her husband, I think the trigger would be that aki declares her love. Somewhere the two are very similar, both are perverts, nice and simple, the only difference is that makoto is not a virgin anymore but she has finally very little experience when we see that she discovers "toys" and that aki sucks her finger...
If her husband continues to be distant and to let makoto isolate itself from the world it will make it easier, and I don't see how makoto can be satisfied with that...