I really don't get why people expect this funny silly Milf x JK fetish manga to go all "Serious drama plot".
Like, I get that some want retribution for the wife's action of being unfaithful and all that jazz, but that clearly isn't the tone that this manga is going for, so why ask for it, when it clearly won't happen?
The husband doesn't matter, his only role is that of setting the mood for the relationship between the parts involved.
What will happen is that this will continue being a funny fetish manga until people loses interest (Which is kind of happening?
The overall interest for Vol 3 was vastly inferior to the actually amazing reception that Vol 1 had, but this kind of manga can go on for a while with a small but solid fanbase), rushes some drama, which is when maybe the husband will get involved, and then ends in a positive note (Like the Oneshots that this artist has done) after either the artist decides to move to something new, or gets axed.