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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

[Kurione-sha (Yu-ri)] Otome Kaikin (One Piece)

Himawari Kansatsu Nikki | Sunflower observation diary

Tokuiten K ~ Umi ma Shokushu ni Senkyo Sareta Kotou ~

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

(COMIC1☆10) [AERODOG (inu)] Yawaraka Mai Senpai (Musaigen no Phantom World) [Chinese] [空気系☆漢化]

COMIC Kairakuten 2016-11

[Ninnindo (Tonsuke)] Momoman 4 ~Keirou Kansha Party~ (Super Mario Brothers)

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

[Tempuru] Albedo & Sucrose's Isekai Observation Research Report

(Bokura no Love Live! 5) [Magukappu (Magukappu)] Honoka to Nozomi no Zubozubo Seikatsu (Love Live!) [Chinese] [师兄汉化]

Kozukuri Deep Kiss

(C71) [Zenra Restaurant (Heriyama)] Sukisuki Bokurano Drill Iinchou (Mega Man Star Force) [English] [DesuDesu]

[Ahemaru] Curtain goshi no Ketsuana NTR | Anal Behind the CuRTN (ANGEL Club 2020-02) [English] [WataTL] [Digital]

(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]

Suki na Hito nara Kowakunai

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

Inda no Onihime Annerose Ch. 1-8

"A" kara Hajimaru Aikotoba

Youkoso Paisen ~AV Joyuu no Kagai Jugyou~

中二病同士の会話

Tsume Awase

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

Honor Student in the Quicksand Observation Booth =LWB=

Sensei's Secret Lesson Chapter 9 END

Action Pizazz 2023-09

[Miyuki] Gyakuten Shinderera ~ dansō ōji no himi no jikan ~ | 性转灰姑娘~男装王子的秘密时间~ [Chinese][莉赛特汉化组]

COMIC AUN 2022-04

Triple Mix

(C92) [Sikouya] Mama ga Nagusameteagerune (Fate/Grand Order)

Gensoukyou Rakuenka Keikaku 05

Seichishiki Zero no Futanari Ojousama ga Bakunyu Maid ni Shaseikanri Sareru Hanashi #2

Konyaku Soshi!... Kara Hajimaru Ani to Otouto no Bousou

Onna Kenshi to Osananajimi to Ojou-sama Densetsu

Observer ni Kansatsu Sareru Deutschland-kyuu Shimai

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

Kyou no Jugyou wa, Chikyuujin no Hanshoku Katsudou no Kansatsu desu | Today's Lesson is Observation of the Breeding Activities of Earthlings

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

Serious sex with a popular idol in the toilet during a class reunion. From cleaning blowjob to creampie..

Dankon ni Kairaku o Motomeru no wa Machigatteiru Darou ka Kari

Maid Flandre Kansatsu Nikki - Maid Flandre observation diary

[Yamane Musashi] Dangan Dead Heat | 胜负难分的超高速弹丸 Ch. 1-4 [Chinese] [Digital]

Perapera Merlin

[Hiiragi Nozomu] Nakasete Yaru yo Yankee-kun | 让你哭噢小混混 Ch. 1-2 [Chinese] [拾荒者汉化组] [Digital]

[Sanbun Kyoden] Observer (COMIC HOTMiLK Koime Vol. 5) [English] [Digital]

Nodokan

(C72) [Nozarashi (Nozarasi Satoru)] Nozarashi Ninbetsuchou Ni (THE IDOLM@STER)

[Yoshino] Onnanoko (South Park)

[Ashiomi Masato] D-Medal [English] {doujins.com}

[Uniyaa (Ikinari Mojio)] Kyou no Jugyou wa, Chikyuujin no Hanshoku Katsudou no Kansatsu desu. - Today's lesson is observation of the breeding activities of earthlings. [Digital]

Daraku Miko Aoi-chan

(SC2017 Winter) [Noraneko-no-Tama (Yukino Minato)] Hikari no Kimi no Saganaki Keikaku <Yuugao> | Lord Hikaru's Cunning Plan <Yuugao> [English] [ATF]

Sarawareta Idol no Matsuro

[Yakitate Jamaica A (Aomushi)] Hatsujou Kiken Chitai 2 (Oozora Subaru, Himemori luna) [Digital]

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[Chinchintei (chin)] Shinigami Hagaijime | 倒固死神小姐的雙臂 (Touhou Project) [Chinese] [鬼傑漢化] [Digital]

Yuutousei Doronuma Kansatsushitsu | Honor Student in the Quicksand Observation Booth

Good Boy, Reek

Mesugaki-chan o Wakarasetai!

(COMIC1☆14) [HATENA-BOX (Oda Kenichi)] HONEY TRAP (Mahou Shoujo Lyrical Nanoha)

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

[Akabei Soft] Chugakusei Shuubouhon (School Rumble)

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

Cosplayer no Kanojo ~Kareshi no ja Todokanai Oku o Tsukarete...~

[Team Plus-Y (Various)] PLUS-Y Vol. 27 (Various)

MIND CONTROL GIAL 8

Observation Picture Diary of Training a Pig