Sister Hole (SisuAna) volumes 1-4 [English, 141 pictures, with the volume 4 Uncensored], by Nakano Sora
(39 votes, average: 4.13 out of 5)
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I gathered here the 4 volumes of the Sister Hole series, by Nakano sora.
Together, they make a puzzling and yet very erotic series, combining fully happy and consensual sex, with complete domination, and even a few creepy yandere+BSDM ingredients.
Addressing those different elements:
– A male highschool boy obediently allows his younger sister to (quoting) “manage” his penis, hiding pretty well her inner freak, he one day woke up wearing the male equivalent of a male chastity belt – I don’t even want to know if it has an actual name, I’ll call it a padlocked dick scabbard. And the pathetic buffoon just went “eh, OK”. Following this, the sister pleases him a lot, and a female classmate joins in until there’s no need for that padlocked dick scabbard anymore.
– And yet, yep, it IS consensual, the brother could walk out of this any moment past the volume 2, but he chooses not to, and by the volume 4, it’s a happy lasting threesome agreement without domination anymore.
– Graphically, that was god-tier art, no doubt. There’s black bar censorship in the volumes 1-2, hideous blurry mosaics in the volume 3, and, finally, gloriously decensored art in the final volume 4.
Well, see for yourselves, maybe you’ll like it ^^
Release credits are for Selcough, N04h and Kafka from White Symphony; Common Bird, Darkhellsing, A-Psy, Danky, NeVMiku, Ro, Rigg and Magikarp_guy from RedLantern TL; and finally Animium, Potato, Kotana, Phalodite and Andyee, from Hennojin. Thank you! 
By the same artist, Nakano Sora, circle In The Sky, I also share Yes Sara Is Here, Aki To Matsuri To Urakaze To, Chotto Dake Ai Ga Omoi Dark Elf Ga Isekai Kara Oikakete Kita vol. 1 and vol. 2, Ice Cream Cherry Blossom, Kuroyuri No Hana, Hiizuru Taka, Shuuya Ni Omou, Hokusai X Okkii Summer Imagination, Omoi Tsuzuru, Bust Survivor, Hokusai-chan No Fudeoroshi (Uncensored!), Ai Kaze and a pack of 4 works (Beauty Summon + Futari Issho Ni + Hanairo Anmitsu + Onee-san Syndrome).
And now, the download & gallery links 
Complete pictures galleries:
Volume 1 – Volume 2 – Volume 3 – Volume 4
Download the Free Hentai Mangas in a Zip file
(138 MB, 141 pictures, English)
I allowed myself to very slightly recompress the images before sharing. You won’t notice any difference with the naked eye, but now it’s only 138 MB instead of 303 MB =)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
–
Smaller version incoming!
As of usual when ☑ the images are in high enough resolution and ☑ the archive is quite big for its number of pictures, and ☑ it offers a significant gain, and ☑ I have enough time to do it, if it may help, I’m offering you a smaller version, in which I resized the images to lower-standard 1600 px resolution.
The zip shrank from 138 MB to 51 MB.
Personally, I prefer it for reading, and it takes less disk space.
Download links, Zip: Mirror #1 – or – Mirror #2 – or – Mirror #3 – or – Mirror #4
Such a generous work, everyone gets a cream-filling.
Just IMHO, I found this pleasant enough in the sense that at least by the close, the *a-hem* clamping device was no longer being applied, but I’d have enjoyed it more if Onii-san could have been portrayed as being a lot more assertive, as opppsed to being dominated most of the time by Imouto-chan or Seitokaichou. Of course, for all I know, Nakano-sensei was simply displaying a case of “Art Imitating Life”, so I’ll debate no more on that point.
As the story comes to a close, my last thought is that, unless Onii-chan develops some more “testicular fortitude”, this may sooner or later be his ultimate fate:
Of course, he just might consider it to be Totally Worth It.