On wife's side she decided to not open the door to reject the manager's advances for sex this annoyed him so he went for the husband to trick him.
Husband for once stood up to the manager and told he had evidence of his wrong doings and to not approach them anymore so manager told him to talk on the rooftop during lunch break and he... Almost killed the husband for daring to defy him so instead he threatened and tricked him to go to hot springs so he could met MC's wife. Well, that's it, he managed to fuck her once more, husband just watched and the sex starved wife got into it, however by the end while the manager was gloating she was crying and the husband was in dismay if it was ok to let things like this happen.