So I know it probably won't happen at this point, but I just had some ideas on the natural way to make the ending a bit more satisfying.
Due to the photo montage at the end, it would be hard to add real dialogue scenes that explore the timeline after arriving at the cabin.
So, I feel like a good addition can be a scene on the plane ride. First, they have some conversations that reveals to all the girls that they are actually a huge harem. I don't think anyone would be shocked at this revelation, except maybe Rebecca lol. Then we proceed to some super orgy on the plane with Stabby Mike having a comedic moment and giving us the thumbs up and some privacy. Land at the destination and roll the photo montage. Unfortunately, we won't have pregnant sex, but the orgy should make up for it.
edit: Also, I'd like to point out that Caribdis gave us the Harem ending first. Most devs would milk the most popular ending route by making it last.