Guys, I think you're missing some of the point. At least to me, it's pretty obvious that
Rich is a story-teller at heart, and that he wants his stories (and the scenes in them) to flow logically. (Or, at least, as logically as they can in an "adult" piece of work.) So, as opposed to just creating random fap scenes, he's taken a portion of what appeared in FF&S and is "bending it" in a different direction. So, yeah, the "Parker sees Melanie with her boyfriend" is similar to the scene in the canon story, but begins the bend, and the second one continues the bend as Melanie focuses much more on Parker than she did in the original, particularly towards the end of the scene. So, now he's set things up so that additional "Parker-Melanie action" will flow more naturally out of the two previous scenes.
If you were expecting a scene where Parker came home and basically said out of the blue "Hmmm, let's go bang my sister," well, that doesn't seem to be how
Rich's mind works. At least to me. Oh, I know, there are lots of games that essentially boil down to that, but it's been obvious to me for quite a while that he doesn't want to follow that path.
Also, remember that he could just have finished FF&S "his way" and walked away from the project. The fact that he's making an effort to go back and tell alternate versions of portions of the story to satisfy his fans seems like a pretty nice thing for him to do.
Personally, I'm hoping for more Becky content some time in the future...