Chyos
Some NTR veteran suggestions:
1.
Expand sex statistics. "Last partner" is most common option. More detailed one is with every male partner, ml of cum poured by each partner, best sex with etc.
2. OOS sex.
Out Of Screen sex. You may consider adding implied sex. Without seeing the scenes or with optional seeing of them. This is common NTR trick, very effective. "Started" with Big Brother (sister's "training" by Eric), common in Japanese games.
Point 1 and 2 together could result girls e.g. sex count to rise after 1h after a girl just enters e.g. mayor's house. Adding sex to the game is so easy! No scenes, no renders, everything in players mind.
3. Almost every girl (non-mother) starts as virgin. Unrealistic, but it is 100% ok, since this is ero game convention. OK! But after we start the game, make
NTR redesign, so every girl has to have
sex every X time. Actually, you already added such solution to the game, but only after given girl's story achieves programmed point. I suggest adding such option for each girl (unless someone switched NTR off). So e.g. Kate WILL fuck some/specific male after X days w/o sex. Just like that.
4.
Pregnancy - unrealistic (9months!) but you can use a convention - pregnancy
takes 3 days. Children are "stored" in dedicated building. An impregnation is very powerful NTR element of counquest and defeat.
5.
Girl's location detector. One can detect that the girl is e.g. in rival-male bedroom at 3AM. One can guess what happening.
Best example of point one, two, four, five and partially three is Japanese NTR masterpiece called "
Forward Ho":
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- btw, look at girls graphics and behavior. Both are so light and cute. Even cheating has so naive explanations ("girl's secret" or "There is nothing wrong if you cheat on MC with us. MC will be still your partner, nit us."). Models are happy during sex.
6.
Plausible deniability - together with implied sex, girl could look like someone who cheats or has sex with other male. But one/player/MC can't prove it. There could be non-sex explanation for every suspicious girl's behavior or situation. Girls lie to MC about their cheating. While Player knows or suspects the truth.
7.
Mystery - with point 6, player could be informed (or collect evidence/guess) much later after actual sex occurred.
8.
Paternity fraud - please make at least one ending, which results MC rising non-his kid. No problem with netori stuff here, so MC could impregnate someone's wife/gf.
EDIT 30092020:
9. In case of NTR it is good to make it dependent on hard to control (by player) variables. Easiest way is to do crude RND. Or variable could be a sexual frustration of woman, which is lowered by circumstances partially unknown to the player (she sometimes masturbates). So, woman will have NTR sex, but in various places, various time, with different men. Player could fine-tune RNG level, so he either wants expected sharing or he want have a surprise.