https://book.dmm.co.jp/product/6222293/b064bcmcm03008/
If you like this work, please 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 𝐭𝐡𝐞 𝐀𝐮𝐭𝐡𝐨𝐫.
代传，nekomoe自购

Manga ver, do not reclass

[Synopsis]

Caution: Excessive Nipple Play

Rena finds herself in a strange game called “Nipple Guessing Game” with her childhood friend Takayuki, sparked by a casual moment.
The rules are simple: if Rena doesn't react when Takayuki touches her chest, she wins; if she reacts, she loses instantly.
“That's a piece of cake” she smugly thought.
But once it started, Takayuki's techniques proved far more skillful than she imagined, making it impossible to stay indifferent.
Gradually, she found herself getting more and more serious about it...?

―My strong-willed childhood friend is surprisingly vulnerable when her nipples are played with―
The hit work that introduced the “nipple torture” genre to the world is finally released as a manga!!!

Base +28, nuts987 +14, darkwing42 +55

这样来看，还有很多单篇没有汉化的。

Base +13