Edited.
Compared that, it is an FPS porn game where we need to kill zombies, the NTR is pretty good too in the game. It was done very well by the Dev that we have to raise the love meter first for each heroine, and only then can the NTR selected as an option. If there is no emotional bond between you and the girls, then we can't talk about NTR either, but fortunately they paid attention to every detail, so you can really feel the jealousy. lol
I hope the Dev will expand the NTR content a bit more yet in this game, however I didn't come here with too much ideas, so I'm not sure what they should add exactly. I doubt we need more NTR quests, because I feel there are already enough of them. I didn't mind at all when I had to look for those items for each scenes, but these 3 tasks are enough at every heroines I guess...
Which I could imagine in this game is that, after finishing the all NTR quests, the heroines instead of just walking up and down aimlessly in the Hometown, they should sometimes wander into their room with the same guy which was in the NTR with them ...but of course, only if NTR is turned on.
Or.. if you give a gift to a heroine from the consume items, currently you can send her to the toilet, bathroom or to the hot spring. It wouldn't be bad some NTR activity stuff as well among these items. The second one wasn't my idea, I just read it here in a comment.
So far I loved every part in this game, I also enjoyed the harem routes, but I wouldn’t mind some more NTR content yet as well.