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https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_285128/
1p-93p ①52歳設定（陰毛多め、ほうれい線あり）
94p-186p ②42歳設定（陰毛無し、ほうれい線無し）

So, from what I can tell, the aunt and nephew had a sexual relationship 15 years prior to the current plot, while the nephew was still in high school (pages 2 & 3.) She fled to Tokyo because she felt guilty for having a sexual relationship with her nephew, and then proceeded to get married to her current husband and have two children. She told neither her nephew nor his mother (her older sister) where she went. Fast forward, 15 years later, they happen to start working at the same company, and go out to a mixer with other co-workers for drinks/reunion. She gets hammered, and the nephew and coworkers brings her to his place where the nephew proceeds to make his move. Of course, their having had a physical relationship before doesn't make the seduction all that difficult. And one more thing, a common theme here is that she's in her 50's.

Base +6, Ashhra +8, wootwoot123 +6, Anonyslime +8, Caravaneer +6, twothousand +6, wdf +6

@NewtBlack
Some say that cum of young boi(aka Doutei in japanese) has magical effect of antiaging...with unholy power of incest, even better of course. Must be true, I studied this theory with thousands of reference in the ocean of manga.

Base +6, Ashhra +8, ElliE8 +6, MercuryLamp -9, NKVDopenthedoor +11, Anonyslime +8, venfare +10

蹲个汉化

Base +6, wushan53 +8

https://www.pixiv.net/artworks/121200708

Base +65

Base +21, jessica702 +13

[Synopsis]

An aunt and her nephew, Kosuke, had a relationship once in the past.
The aunt moved to Tokyo out of guilt and got married.
A few years later... the two meet at the same company.
Kosuke can't forget that day and the aunt has completely lost her sex life.
Kosuke takes his aunt back to his apartment after drinking a little too much at the welcome party...
And the time of the two begins to move again...
It is a pure love story about Kosuke, who is still in love with his aunt even after turning 50 and doing naughty things to her while calling her ''cute'' and ''adorable''.

Part 2: /g/3193999/a2828bf3cd/#c7091441

Base +25