I've honestly not thought about it that much. It does make sense for the endings, doesn't it? So... Maybe?
It wouldn't be a major feature, though.
That would be a nice end game situation. I see Futa getting the MC and his harem. So... MC only making a baby with the Futa seems like the logical choice while the Futa gets babies with the other girls. This is a NTR game after all. But I see a good happy ending for all. If you get what I am saying lol (evil laughter).