Why you guys keep debating if the game has NTR or not when it clearly already has ?
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1)
Its directed to the reader foremost and not automatically for the Main Character.
Otherwise you would get
Multiple Protagonist tag which some developers use to trick the system.
If MC is fine with that, (willingly) then it gets also the the
Swinging tag.
Even if its avoidable (not like in this game but still for a example) for just a single, small scene, the game still has this type of content and hence it will get the NTR tag.
Its not rocket science. Its the same if you have 0.01% pork in the meal, its not Halal anymore.
Yes I know, I also wish we get more specific Tags about NTR related content but we can only work with what we have.
2)
The Sister is a LI in the game for the MC, no mater how you wanna slice it. You get her in both paths with the same content and same amount of influx to the MC.
The "Harem"
path and in the NTR path.
And until the game makes her a Second Main Character without intervening with the MC in any form whatsoever (so that the Reader dont get any jealousy feelings from it) + (
Multiple Protagonist tag), then the NTR tag is justified.
She is not a side chick who has just a single sex scene for sex scene sake who never reappears again after that.
Its up to the devs "skill" as a writer how he wants to justify all this fucked up stuff but the point stands that she fucks another guy, aka your own dad behind your back in secret and this will make people jealous/ getting them feel cucked...therefore NTR.
Once again, its not rocket science.
But that pushed aside, I personaly find it more hilarious that there are still some people who dont see what the dev. is doing.
He makes these NTR content intentionally for obvious reasons, but tries to cover it up by making the MC being not aware of it with the typical "they arnt a couple yet so its fine" type of story progression.