Invest Siblings

Love Kachuu Chapter 12 "Sibling Summer Vacation"

Komi-ke no Kyoudai Asobi The Komis’ Sibling Playtime

Kyoudai no Kazoku | Siblings' Family

You Will! -Fuyukawaka siblings story-

Two Siblings' Fela Pure - Chapter 1

Shuukyoujou no Riyuu de Onanii Dekinai Kyoudai | Siblings Who Can't Masturbate For Religious Reasons

CLUB DE INVESTIGACIÓN CIENTÍFICA

[Saikoro Steak] Josousakan Saeko | The Woman Investigator Saeko

[Jamming] Kyonyuu Sousa-kan Yura - Bitch Order | Yura Big Boobs Investigator - Bitch Order Ch. 1 [English] [Raknnkarscans]

Fellatio Kenkyuubu | Departamento de Investigación de las Felaciones Ch. 1

[Isako Rokuroh] Kyoudaizakari | Sibling Lust (Bishoujo Kakumei KIWAME 2009-04 Vol. 1) [English] [darknight] [Decensored]

Taima Sousakan Ayano (Demon Investigator Ayano) [ENG]

No Longer Siblings

Siblings In The Train

[Mutsuki] Kyoudai no Kyoukaisen | The Siblings' Ley Line (Kono Mama Naka de...) [English] {Hennojin} [Digital]

Crime Scene Investigation - Takeshi Matsu (Bara)

[Saimin! Pikatto House (Tetsuya, Routa)] Saimin Shihai [Sumi] ~Rias no H na Torishirabe~ | Hypnosis Control ~Rias's Ecchi Investigation~ (Highschool DxD) [English] (Trinity Translations Team)

Kyo-dai After | Siblings After

Shippai! Otori Sousa | Failure! Investigation Bait

[Zaki Zaraki] Aru Kyoudai no Baai | In The Case of Certain Siblings (Hamezukids) [English] {Mistvern}

[Kuruma Ebi] Chousa File H - Investigation File

Detective Chun-Li Boobie Investigation

Aki Sora Ch5 - The Close Siblings

Closed investigation journal

[Jamming] Kyonyuu Sousa-kan Yura - Bitch Order | Yura Big Boobs Investigator - Bitch Order [English] [Raknnkarscans]

[Aoki Kanji] Kyoudai no Himitsu no Su | The Siblings' Secret Nest (COMIC Anthurium 2016-10) [English] [Team Koinaka] [Digital]

[Sakaki Naomoto] Tokumei Chikan Otori Sousahan | Special Molester Decoy Investigation Squad [English] {Doujins.com}

[Nakami Yoshikage] Taima Sousakan Sanae ~Shokushu Ingyaku~ | Demon Investigator Sanae (Rider Suit Heroine Anthology Comics 2) [English] [SaHa]

[Shimanto Shisakugata] Kyoudai tte ii na | Siblings Sure Are Great (Comic LO 2014-01) [English] {5 a.m.}

TS Detective Niizuma Hiromi Investigate the missing college student case!

(Yonekura Kengo) Warau Kangofu First Limited Edition ~ Smile Nurse [English translation](Part3. Stupid Siblings)

Komi-ke no Kyoudai Asobi | The Komis’ Sibling Playtime

Bijin Kensatsukan Hamerare Chijoku Sousa | Beautiful Prosecutor's Framing and Rape Investigation

[Hiratsura Masaru] Sennyuu Sousakan Erika | Sneaking Investigator Erika (COMIC SIGMA 2008-03 Vol. 17) [English] [SaHa]

Nandemo Chousa Mama Shizue | The All-Around Investigator Momma, Shizue

Shite Ii Kyoudai | Incestous Siblings

Mahou Tokusou Greedia3 - Magical Investigator Greedia3

Gyaru Hakase no Himitsu Kenkyuu | Gyaru Professor’s Secret Investigation

Tokumu Mayaku Sousakan Linda | Special Narcotics Investigator Linda

Busty Married Woman Investigator Yuka

[Oogoshi Koutarou] Ryouki Keiji Marusai - detective investigating bizarre case;MARUSAI -

Shite Ii Kyoudai Incestous Siblings

Kyoudai no Kyoukaisen | The Siblings' Ley Line {Hennojin}

Sibling Play

siblings

[ReDrop] Undercover Investigator Atsuko Saejima [English] =LWB=

[NO.Gomes] Gravity Die - TS School Infiltrating Investigator: The Shameful Stripshow (TS Gakuen Sennyuu Sousakan: Chijoku No Stripshow) (English)

Shota Eater Chapter 1 - Sibling Relationship

Undercover Drug Investigator Monica & Jita

[Oomori Harusame] Kyoudai Ijou Koibito Miman | More than Siblings, Less than Lovers (COMIC HOTMILK 2010-06) [English]

[Sakaki Naomoto] Tokumei Chikan Otori Sousahan | Special Molester Decoy Investigation Squad Ch. 1-6 [English] {Doujins.com}

Two Siblings' Fela Pure - Chapter 3

[Saimin! Pikatto House (Tetsuya, Routa)] Saimin Shihai [Sumi] ~Rias no H na Torishirabe~ | Hypnosis Control ~Rias's Ecchi Investigation~ (Highschool DxD)

Shippai! Otori Sousa | Failure! Investigation Bait

The S&M Siblings Across From Me

[Sakaki Naomoto] Tokumei Chikan Otori Sousahan | Special Molester Decoy Investigation Squad Ch. 1-3 [English] {Doujins.com}

Tokumei Chikan Otori Sousahan | Special Molester Decoy Investigation Squad Ch. 1-2

(C86) [Imitation Moon (Narumi Yuu)] Gamer Kyoudai ga Sex wo Oboeta You desu | It Seems that the Gamer Siblings Picked up Sex (No Game No Life) [English] [The Chrysanthemum Translations]

[Sakaki Naomoto] Tokumei Chikan Otori Sousahan | Special Molester Decoy Investigation Squad Ch. 1-2 [English] {Doujins.com}

[Hindenburg] Kyoudai Ai | Sibling love [English] [SaHa]

Tokumei Chikan Otori Sousahan Ch.1 | Special Molester Decoy Investigation Squad Ch.1

[Mikami Hokuto] JUNK Kyoudai | Junk Siblings [English] [desudesu]

Chichi Katajikena Sousakan | Shameless Breast Investigator

Shousa, Otori Sousa o Suru | Group Molester Decoy Investigation

[Almarosso] Manbiki G-men to SEX suru | Having Sex with the Loss Prevention Investigator [English] [desudesu]

Atlantis Investigation

Two Siblings' Fela Pure - Chapter 5

summer siblings [English] [Rewrite] [gOZER45]

Gyaru Hakase no Himitsu Kenkyuu | Gyaru Professor’s Secret Investigation

Tokumei Chikan Otori Sousahan | Special Molester Decoy Investigation Squad Ch. 1-3

Siblings Stranded [English] [Rewrite] [EZ Rewriter]

Sibling Rivalry [English] [Rewrite] [olddog51]

Nitamono Kyoudai | Siblings are very much alike

(SC2016 Winter) [cocon! (Otone)] Evenkuruga no Shitei | Evenkuruga Siblings (Utawarerumono Itsuwari no Kamen) [English] [EHCOVE]

[Tokisana] Undercover Investigator Suzu (English)

Atlantis Investigation

[Sabawo] Monochrome Siblings [English] [Boutok]

Kyoudai Switch | Siblings Switch

Sibling Service [English] [Rewrite] [Xeno]

More than Siblings - Less than Lovers

[Yoru no Oto] Woman Investigator K - Mayaku Sousa Hen | Woman Investigator K - Narcotics Investigation (Slave Heroines Vol. 9) [English] {doujin-moe.us}

Kyoudai de Enmusubi | We're Siblings but Let's Get Married

Mahou Tokusou Greedia4 - Magical Investigator Greedia Final

[Tensei-kun] Kyodai - Ane to!! | Siblings - With Sister!!(COMIC Masyo 2012-01)[English][Amoskandy][Digital]

Evenkuruga Siblings | Evenkuruga no Shitei

[Zarigani Arms] Aloerosy (Muhyo and Roji's Bureau of Supernatural Investigation)

Sudou Ie No Seijijou | Sudou Siblings Sexual Circumstances

[Supralpaca] Sibling Play [English]

Nympho Siblings [English] [Rewrite] [EZ Rewriter]

[Nakami Yoshikage] "Sudden Shock! Female Investigator Asuka"

[Tsubaki Jushirou] Danchi Kyoudai no Gogo | The Apartment Siblings’ Afternoon [English] {Hennojin}

Two Siblings' Fela Pure - Chapter 6

(C89) [Mofu Shippo Lab (Subaru.)] Kyoudai de Tomodachi de Koibito na Boku to Neko | Siblings, Friends, Lovers: My life with a cat (Touhou Project) [English] [ATF]

Sudden Shock! Female Investigator Asuka

Nyotaika Sousa sarechimatta | Gender Bender Investigation

Atlantis Investigation

(SC2016 Winter) [cocon! (Otone)] Evenkuruga Siblings | Evenkuruga no Shitei (Utawarerumono Itsuwari no Kamen) [English] [EHCOVE] [Decensored]

Sexy Undercover Investigation! Don't spread it too much! Lewd TS Physical Examination Part 2

The Tadano Siblings Can't Control Their Urges

Secret Sibling Sex [English] [Rewrite] [EZ Rewriter]

[Nigami Whip Milk (Iegami)] Shite Ii Kyoudai | Incestous Siblings [English]

Uwasa Saguri Kouhen | Rumor Investigation - Part Two

Goblin Prison Investigative Report

[Sawada Daisuke] Hitoduma Tantei no Chinkenpo | Married Investigator's Chinkenpo (COMIC Shingeki 2011-01) [English] [SaHa]

Closed investigation journal

Nakayoshi Kyo-dai | Close Siblings

(SC2016 Winter) [cocon! (Otone)] Evenkuruga no Shitei | Evenkuruga Siblings (Utawarerumono Itsuwari no Kamen) [English] [EHCOVE] [Decensored]

[Isako Rokuroh] Kyoudaizakari | Sibling Lust (Bishoujo Kakumei KIWAME 2009-04 Vol. 1) [English] [darknight] [Decensored]

Hazukashii Chibusa Chapter 4: Sibling Union

(C75) [Shallot Coco (Yukiyanagi)] Yukiyanagi no Hon 18 Chun-Li Keiji no Oppai Sousa | Detective Chun-Li's Boobie Investigation (Street Fighter) [English] [Hentai from Hell]

(C66) [Ukkaridou (Inari Satsuki, Shimazu Isami)] Nagisa no "..." | Sibling Showdown (Pretty Cure) [English] [sirC]

[Souko Souji] Hentai Kyoudai to Inu | Pervert Siblings and Their Dog (COMIC Tenma 2013-04) [English] [Hentai Bedta] [Decensored]

[OHKOSHI Koutarou] - Detective Investigating Bizarre Case (Ryouki Keiji MARUSAI) - [ENGLISH]

Two Siblings' Fela Pure - Chapter 4