I understand that it focuses more on Yuma because that also excites her husband a lot, he also enjoys watching and imagining his wife having sex with another man. But it would also be great if he had a higher percentage of scenes with his wife. That the number of scenes be more equal for both. Let it be more like a love triangle instead of a relationship where they have a stalker who spies on them and masturbates while watching them have sex hahaha.
Obviously, this is just a fan's wish, you can do whatever you want with the game. Best regards, and have a good day.