I understand you, but let me make it clear - giantesses were originally people too, that's why I brought up this topic. Yes, they've become huge and they've lived longer, but that doesn't take away from the fact that they were all originally human women, which is why I thought they had to change a lot during that time. They didn't become aliens or monsters, but only grew in size and began to live longer. As for the reduction device, I'm glad that it will be in the plot. And now the last part, which you probably did not understand. I wasn't talking about the main character, he has a fetish for giantesses, that's right. And I wasn't talking about the main characters, I'm talking about ALL the giantesses from their world, and all the guys from the world where the main character came from. The main character's harem won't literally consist of all the giantesses, right? That's why I suggested that it wouldn't be bad to establish contact with the world where the main character came from. To make an ambassador out of him so that he can establish contact between his world and the world of girls, because I am sure that other girls (besides the main three) want happiness in life. And something tells me that their children will be smaller than their mothers, and the world of giantesses can be repopulated by humans.
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What I basically want to say to everyone is this: If you can still include in your plot a twist where not only the main character and his chosen ones get a happy ending, but also other girls from the world of giantesses, then I would be glad. And I’m not talking about a harem, because absolutely all the girls (and I’m sure there are quite a lot of them) won’t be able to join it. Each girl (except for the main character’s chosen ones) should have her own beloved, so to speak. And contact with the main character’s world could help the development of the giantess world.
Yeah, the giantess in this world are still basically human somehow, but they have to adapt to their giant reality. For example, they consume more food than before so they have to change the way they produce it. All giantess are split into a small community of 6 to 20, each of them produce different food and can trade them at a central market hub that connect all different community nearby. The main goal of this is to avoid long travel and food waste as much as possible. That concept isn't perfect, but efficient enough to make sure all giantess could eat correctly.
Another adaptation for the giantess is they are simply too heavy to use any kind of transport such as cars or planes so they have to travel by foot only. Trading with other giantess living on another continent over sea is nearly impossible. They can still use a boat to access other continents, but this means of transport is very slow and pretty dangerous for them. Since the giantess eat a lot, they have to carefully manage their ration during their travel; if not, it's a certain death.
For the harem path, it will consist only the six giantess the MC interact with in the main story because let's be honest, the MC won't live long enough to have sex with all existing giantess which is estimated around a million.
And finally, I like your suggestion to make the MC as an ambassador between the to world. I will keep that in mind.
Here! THAT'S IT! You've come up with the perfect plot for yourself! Think about it, if giantesses can't travel by transport and trade with other continents is impossible, then this is where politics should come in between the world of giantesses and the world where the main character came from. But think for yourself, given the size of the girls, they can easily create ships or planes for ordinary people, and those can establish trade with other giantesses for them or install sinks to teleport giantesses to a new continent. In fact, it will be mutually beneficial for both sides! In fact, girls will be able to start relationships and have children again (well, having sex is more or less normal if our pink-haired inventor can improve the reduction system or at least extend it), trade and communication with other girls will be established, technology can be introduced again, and so on! You have a plot that basically gets into your hands! Patty's teleport is essentially the solution to all the girls' problems (and I'm not just talking about mixing between islands) It will breathe life back into the world of giantesses, and it will be even more fun. Of course, not every guy wants to live among giantesses, but I think there will be enthusiasts and interested parties in this + giantesses' resources and technologies over these 500 years...it seems that you may soon have a good story or even more.