I mean, if they didn't go through with it, it wouldn't be as fun. We know whats likely to happen if they didn't.
Mom sends shit to his bosses, the old man denies it and easily can because the sender has no proof. Even if she sends in the letter it just proves the daughter has a crush on him. They lay low for awhile until its legal.
The story would've ran dry quick if it simply didn't go in that direction and would've died on a less than climatic note. Its unironically better they went this route.
