Shishunki No Ritomasu (“The Litmus Of Adolescence”) [English], by Kasetsu Makoto
Quoting the female main character, talking to her male childhood friend: “I want you to walk beside me. I don’t want you to remain just as a kid who’s always following my footsteps.”
That was beautiful, as a declaration. Thoughtful, significant, bearing promise… I was moved, when I read it.
And thus, here is a vanilla WAFF manga in which a girl offers (quoting again) “grown-up rewards” to motivate her special one into becoming the best version of himself. Needless to mention, it’s hentai, we not only get the feels and heart warming happiness, we’re also treated to more than decent sex along the ride
Oh, and inb4 someone asks, I’ll confess I didn’t know the meaning of the word until now, here’s the definition for litmus: “a test in which a single factor (such as an attitude, event, or fact) is decisive” (*)
Thanks a LOT to Nisor for this most wholesome release!!
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(19 MB, 33 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
In The End, Those Who’s Opinions Really Matter (Ei-kun, Kozue-san and us Fans Of Vanilla) WON, and Won BIG TIME:

McCormick just called. They want their vanilla back.
I always love how writers try to polish the turd that is adolescence.
The Litmus of Adolescence sounds a lot more elegant than the truthful, The Awkward, Clumsy, Grab-Ass of Adolescence.