O wa x O Taisetsu Ni Surubeki Darou [English], by Hisakawa Tinn
(18 votes, average: 2.89 out of 5)
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There’s a little spoiler to this story, I’ll resist temptation and let you go “I should have guessed!” yourselves, if you don’t mind ^^
Other that that, it’s a simple scene, two highschoolers, a pettanko meganekko with a bit of a tsundere nature, and a boy whose engine simply won’t stop once it has started :3
I’ll shut up before I finally write that spoiler, so: thanks to N40h and Herzer, and enjoy…
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(11 MB, 20 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2
Makes the beast hair on my back stand up.
That “onii-chan” reference on page 20 seemed to come out of nowhere, like some final fatal strike technique. Was it just a term used towards an older male, or did we get a “Surprise, Incest!” laid upon us?
Answer needed for … er, research purposes.
The title translates to “O should take good care of X, right?”, where “O” and “X” are stand-ins for something censored. Together with the little “surprise reveal” they threw on us, I’m pretty sure “O” = “The big brother” and “X” = “his little sister”. So, yeah, happy surprise