Yuki should be less busty than what she currently looks like in the game. She is canonically a C-cup.
Her and Alya shouldn't have the same body.
Good luck
Hi, I adjusted Yuki's bust size and height for the 0.12 update (which I uploaded to itch.io yesterday), where the character Masha was also introduced.
Unfortunately, I had already committed to releasing the update and only then realized Yuki's size, so I tried to make the change for that same update.
Although the size is different from Alya and Masha, it still seems like it might be larger than a C cup.
I'll make sure to research more thoroughly and reduce it in future updates.
I read the steps suggested to update the game here on f95, but I didn't give myself enough time to follow the procedure. I'll be reviewing it in the coming days.
Thanks for the suggestions and cheers!