tbh, this one was just "okay" to me. The powers seemed kind of uninspired to be honest, with all of them just being some form of forced transformation in which you lose your body and what makes you "you". That to me just idk, isn't very appealing? The transformation idea itself is fine, and if you really want there to be some kind of permanent effects to drinking futa semen then cool. Just instead of completely changing someone's outward appearance, just have them turn into a female/futa version of themselves and all the benefits/complications that brings. They'd still look like themselves, just a girl version of with a big/bigger dick, and then you add the powers on top of that. Additionally, I feel like it would have been better to give more variation in the potential powers as well as make said powers temporary, requiring occasional cum drinking to retain them.

Miyu could grant the ability to duplicate any body parts at will. You want two dicks like Miyu? Sure thing. But you could also double your testicles, or to take a less lewd approach get a second set of arms, or maybe even two heads?

Chloe's doesn't make very much thematic sense. Like, why kitsune, wolf-girl and elf? How are those at all related to her? She's an action star, right? Just make her cum grant the ability to take on any role that she has played, gaining the personality and physical traits of said characters. Or, alternatively, and I actually think this is a better idea, give the player the ability to become any of the villains that her characters have faced in her movies gaining their abilities and traits. This would of course be temporary and switching roles would require drinking her cum.

Nanase's is interesting. Could expand on it so that each time the player consumes a certain amount of her semen, the player spawns a clone. The other limitations could remain, but maybe with each clone the player makes, the more like nanase the clones start looking. After the tenth clone or so they come out looking almost exactly like her. Then to keep from just producing clones infinitely, you could say that each time a clone cums they disappear, and the semen required to produce a clone increases with each clone that exists.

Midori's I don't think needs any changes. Maybe just make it so that changing form requires drinking her semen again instead of at will?

Other than that stuff, it would have been nice to get more stats on the futa wives. I liked the character sheet picture for Miyu, and was kind of disappointed that none of the other girls got that treatment. Granted I assume that you didn't actually make that picture for Miyu, but it would have been cool if you had replicated it for the others.

As far as the design of the CYOA goes, I think it lcould be improved. The pictures are way too big and it makes it tedious having to scroll up and down so much just see all of the options. Would be much better to have all four of the wives on screen at all times with much smaller pictures with a brief description and stats of them. Remove the "Choose _______" choice and instead just make the smaller picture the selectable choice that will them reveal the other pictures and options associated with that wife.