From all your comments, before they are deleted anyway, you seem to really focus on Terraza's size. You may actually be more of a size queen than what you make Ayumi out to be. It seems to the deciding factor of what makes the game NTR in your replies. Like somethings gets triggered by the idea of your girl having sex with a cock larger than yours, and it's all you can focus on. You've made it really obvious, but you try to hide it by insulting the game to disguise your Big Cock fetish.
This is your poor answer, my 11 year old nephew answers better than you, however, I can understand that not everyone can understand, so I indulge you, I asked a question, but no one was able to give an intelligent answer, of course, maybe because, I'm not there, but I repeat, in addition to the fetishism for a bigger cock, I find this difference in measurements useless in an NTRS, the VN should focus on the erotic game of the couple, but if in the plot, you include two other dominant characters, and also super gifted, make the game, an NTR, because it means that Ayumi is pushed towards Terraza, not to play with kento, but to enjoy the big cock. if someone doesn't understand the explanation, ask, I can make it even more childish.