Actually, the husband knew that his wife was fucked by someone else, but for some reason, the guy accepted to be fucked, why is that and if you want to know, ask the director...
The content of the bamboo movie above is just like the title, a young couple practicing massage at home (to the place of service), on a beautiful day, the wife was groped by a lewd guest, she did not resist immediately informing her husband but silently "suffered", the reason for fear of offending the guest and losing her job, or want to "ride the wind" with a new cock...??? I don't know this.
And that day is not the last time this wife betrays her husband, what will happen, you continue to watch the movie.