So I went back and looked at some of Momoka's stuff and also Yuka's, keeping in mind what you wrote, looking for some evidence for implants and other than extremely well shaped breasts, there is nothing suspicious about them. I tried to make some gifs and maybe you could point out what exactly is "wrong" in the way the behave. Momokas breasts are certainly a bit firmer in comparison but still extremely soft and squishy to the point an implant would show if it was there. Both pairs hang and move naturally, Yukas more than Momokas and they change shape over the years as one would expect due to aging.Read my post again.
No, the photos are not photoshopped. You only posted what I described in my previous post ... Kyouko before ... the change.
Momoka
https://redgifs.com/watch/ickycoolkinglet
https://www.redgifs.com/watch/lightcoralcomposedturnstone
https://www.redgifs.com/watch/kosherlightslatebluescoter
Yuka
https://www.redgifs.com/watch/icydistantchick
https://www.redgifs.com/watch/delectableunevengonolek
https://www.redgifs.com/watch/nutritiousanimatedflickertailsquirrel
https://www.redgifs.com/watch/slimsunnyseaslug
https://www.redgifs.com/watch/writhingopulentisopod