My Big Brother Was Making a “Little Sister Observation Record,” So I Pretended to Have Zero Sexual Knowledge and All Sorts of Things Were Done to Me

[Kagehara Hanzou] Imouto zukushi + Imouto ijiri | Eat Up Little Sister + Playing with Little Sister [English] [Yoroshii] [Decensored]

More than a little sister, less than a friend? / More than a little sister, less than a bride?

Aneppoi no -my sister, like sister- | 누나 처럼 -my sister, like sister-

(C92) [Tetchan Hato (Minasuki Popuri)] Himawari Kansatsu Nikki | Sunflower observation diary [English] [ATF]

[Momoyama Jirou] ABDUCT ～Ike Nai Shiiku Kansatsu～ | ABDUCT ~The Wrong Breeding Observation~ [English] [desudesu]

[Momoyama Jirou] Jinbobo ~Abunai Shiiku Kansatsu~ | Jinbobo ~The Dangerous Breeding Observation~ [English] [desudesu]

[Ameyama Denshin] Yuutousei Doronuma Kansatsushitsu | Honor Student in the Quicksand Observation Booth (ANGEL Club 2015-07) [English] =LWB=

(C86) [waterwheel (Shirota Dai)] Suguha-chan Kansatsu Nikki | Suguha-chan Observation Diary (Sword Art Online) [English] {doujin-moe.us}

(Comitia100) [Metiorite Observation Center(Mi no Ji)] Mimesis

(COMIC1☆6) [40010 1-GO (40010Prototype)] SAKKN Shinobu no Araragi Koyomi Kansatsu Nikki | SAKKN - Shinobu's Observation Diary of Araragi Koyomi (Bakemonogatari) [English] [QB-TL + doujin-moe]

[Nohri Isawa] Naisho no Kansatsu Nikki (Secret Observation Journal) [English] [Mistvern]

[Takada Kouichi] Lab Coat Female Observation [ENG]

(SC56) [Waffle Doumeiken (Tanaka Decilitre)] Buta-san Choukyou Kansatsu Enikki | Observation Picture Diary of Training a Pig (Accel World) [English] [biribiri]

(SC49) [Marked-two (Maa-kun, Juuichijou)] Fumi-chan no Kansatsu Nikki (Ge) | Fumi-chan's Observation Diary (Bottom) [English] [desudesu]

(COMITIA92) [Marked-two (Maa-kun, Shichijou)] Fumi-chan no Kansatsu Nikki (Jou) | Fumi-chan's Observation Diary (Top) [English] [desudesu]

(C64) [kodomo challenge (Various)] natsu no kansatsu nikki | Summer observation diary (Original) [English]

[Kurubusi-kai] Suisei Observation (Rozen Maiden) [ENG]

(Kouroumu 13) [Konpekitou (Touya)] Maid Flandre Kansatsu Nikki - Maid Flandre observation diary (Touhou Project)

(C83) [Watosato (Sugiura Sen)] Yae-chan Kenbunroku!! | Yae-chan Observation Record!! (Ganbare Goemon) [English] =TV + Chocolate=

ABDUCT ～Ike Nai Shiiku Kansatsu～ | ABDUCT ~The Wrong Breeding Observation~

Jinbobo ~Abunai Shiiku Kansatsu~ | Jinbobo ~The Dangerous Breeding Observation~

Observation Picture Diary of Training a Pig

Honor Student in the Quicksand Observation Booth

Jinbobo ～Abunai Shiiku Kansatsu ～ | Jinbobo ~The Dangerous Breeding Observation~

Honor Student in the Quicksand Observation Booth =LWB=

Himawari Kansatsu Nikki | Sunflower observation diary

ABDUCT～Ike Nai Shiiku Kansatsu ～ | ABDUCT ~The Wrong Breeding Observation~

Suisei Observation

Maid Flandre Kansatsu Nikki - Maid Flandre observation diary

Yuutousei Doronuma Kansatsushitsu | Honor Student in the Quicksand Observation Booth

Sonia's pokemon observation gone wrong

[ppatta] Yasei Ningen Kansatsu Nisshi | Wild Human Observation Record [English] [Digital]

[Fujisaka Lyric] Imouto ga Ichiban Kawaii | Little Sister Is The Cutest (LQ -Little Queen- Vol. 5) [English] {Mistvern}

(COMITIA123) [squeezecandyheaven (Ichihaya)] Imouto wa Chotto Atama ga Okashii + Omake | My Little Sister Is a Little Weird + Bonus Story [English] [ATF]