There's 'Futa Wife in the Parallel Universe'. It's about a scientist who accidentally opens a portal to a parallel universe where his wife has a different form (futa). The story follows their journey as they try to understand the differences between the two universes and close the portal to prevent any unwanted chaos.
A great free sci - fi story in this vein is 'The Wife Exchange Experiment on Mars'. A group of colonists on Mars decides to do an experiment where they swap their partners for a period. One couple, where the wife has a unique 'futa' characteristic, faces various challenges and discovers new aspects of their relationship during this exchange, all while dealing with the harsh Martian environment.
Chapter 73, "Visit To The Elderglow Academy III", is the clearest early answer because it turns Dean Godsthorn's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Standing in the middle of the teleportation array within a certain... and follows through with It's been decades since we were last here so I'll have to bother you....
Chapter 446, ", Mutinous Star Warriors", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from If it were only members of the Marine Corps, that would be one thing,... to How could they possibly get the help of Interstellar Warriors?!.
Chapter 422, ", Close Your Eyes, It Will Be Fine in a Moment", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Major General Du Shiliang, the formation you command will return to... and follows through with When I say we should establish a United Fleet, it will be a United....
Chapter 465, ", the Alliance Rushes to the Battlefield!", is the clearest early answer because the buildup finally cashes out in a real clash. Early on, After washing the ship, Gu Hang, slightly fatigued, realized it.... By the end, And these could not be obtained by squeezing civilians and workers.. Inside the broader family politics storyline, the danger stops being abstract and the conflict around family politics becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 501, ", Busier After Peace", is the clearest early answer because it turns Space Domain Government's situation into a concrete plot event. Early on, At the meeting, many senior officials of the Alliance were still.... By the end, By then, it might not just be a matter of money..
Chapter 103, "I Don't Plan On Failing I", is the clearest early answer because it turns Damien's situation into a concrete plot event. Early on, The campfire crackled softly, casting flickering shadows over the.... By the end, As he exhaled, his breath forming a faint mist in the cold air, he....
Chapter 476, "Racing to Claim Land", is the clearest early answer because it turns Green Skins's situation into a concrete plot event. The chapter turns that into something concrete by moving from After the brief conversation between Gu Hang and Erso had ended, the... to These Green Skins, scattered across various worlds throughout the....
Chapter 68, "Owning Grade Four Summons", is the clearest early answer because it turns Damien's situation into a concrete plot event. The setup is As the reality of his advancement dawned on him, Damien couldn't help..., but the pressure keeps building through Hehehe…" Damien chuckled, his voice and tone sounding like he'd been....
Chapter 443, ", the mobilization ratio must be higher!", is the clearest early answer because it turns Great Chieftain's situation into a concrete plot event. The chapter gives readers a real answer by opening on Inside the Temir Star System, on the flagship 'Giantsfield' of the... and ending on The earliest had been conquered for over fifty years; the most.... In story terms, the chapter closes with The sudden advance of the human military took him by surprise.
Chapter 485, ", Marshal Gu", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The setup is Gazing at the planet before him, he couldn't recognize it as Earth,..., but the pressure keeps building through The impression of that blue and beautiful planet was completely gone..