A question mark on incest, it's never made clear if it's his real aunt or in-law. A precision on genre, this is simple cheating, not NTR/Netorare.
Japanese Name: N/A
English/Original Name: Kaori's Secret
Associated Names: N/A
Author: Shunjou Shuusuke 春城秋介 (alt. sp. Shunjyo Shuusuke)
Artist: Shunjou Shuusuke 春城秋介 (alt. sp. Shunjyo Shuusuke)
Translator: DesuDesu
Commissioner: Setebos
Genres: Seikō 性交, Insesuto?, Obasan, Kongaiseikou, Jukujo, Kounaiseikou, Kyonyuu, Nakadashi, Baibu, Anarusekkusu, Meganekko
Language: English - translation from original Japanese
Source: Comic Mujin 2011-02
Chapters: One-Off
Pages: 28
Size: 15.8 MB

I'm not sure what to think. It's probably not NTR because we have no real rapport with the guy who's being cheated on, but I can't but help feel a little bad for him.

Great art, though.

Base +9, Binglo +7, McRawr -7, joseph joestar +11, Rockstopper +6, Tenchi Ryu +7, Dikastes +9, sradu86 +7, Ooe Kintarou +5

I really can't stand the kids hair.

Base +8, joseph joestar +11, Rockstopper +6, Incendium +2, Dikastes +9, Ooe Kintarou +5

(Yes, responding to an old post)
Depending on how you would define 'incest' amongst relatives of course.
Picture 3: "He's my nephew, Eita"
Picture 8: "Ah, nee-san. It's me".

So she would be his aunt making it incest in some degree.

Base +8