The British Library Has hentai cartoons

[Werk (Andou Shuki)] Oshigoto Theater 8 (The IDOLM@STER MILLION LIVE!) [Chinese] [無邪気漢化組] [Digital]

[PNO GROUP (Hase Yuu)] Devil Bitch Project ~Shinya no Kanjousen ni Yarasete kureru Akuma o Mita!~ | Devil Bitch Project ~I Saw A Devil Who Let Me Fuck Her In The Loop Line Late At Night~ [English] {Doujins.com} [Digital]

[Starless Aeon] Nikudorei Gokko | Cock Corpulent Mama (Athena)

(C55) [Saigado (Ishoku Dougen)] The Athena & Friends '98 (King of Fighters) [Decensored]

(C92) [Fukazume Kizoku (Akai Mato)] Miki no Honey wa Do-M-san Nano (THE IDOLM@STER MILLION LIVE!) [English]

(COMIC1☆10) [MoonPhase (Yuran)] Jougasaki Mika no Yasashii Yume (THE IDOLM@STER CINDERELLA GIRLS) [Chinese] [无毒汉化组]

[the_orz] Mujintou

[Goma Brothers (Gomabura)] Makio-kun Tanetsuke Oji-san to Ochinchin nanka ni Zettai Makenai Hon (THE iDOLM@STER SideM) [Digital]

[The Seiji] Hamichichi Onee-san ~Kinyoubi wa Hentai~ [English] [MODEM_ON_FIRE]

Seishun amigo~datte otoko no ko damon~ (Ookiku Furikabutte)

(Futaket 8) [Majimadou (Matou)] THE BLACK & PINK PARADE C-SIDE (THE IDOLM@STER)

[MatsuCha. (Maccha)] Matsuno-ka jinan wa kyoudai ga daisuki | The Matsuno Family’s Second Son Loves His Brothers (Osomatsu-san) [English] [Rotti Totti]

(C88) [NxC Thermit (Nohito)] Konna ni mo Itooshii (THE IDOLM@STER CINDERELLA GIRLS)

[Sutaji o gomasen be] KO. KO. TASTY (kokoro library)

[Daisaku no Iru Circle (Various)] Tada Riina no Nuck'n Roll (THE IDOLM@STER CINDERELLA GIRLS) [Digital]

[Hashida Mamoru] Kikkake (COMIC Shingeki 2012-02) [Chinese] [Decensored]

Haha ni Koishite 3 Omoide no Natsu | Making Love with Mother Part 3 Summer Memory

[Ninnindo (Tonsuke)] Momoman 3 ~Netorare Hime~ (Super Mario Brothers) [English] [N04h] [Digital]

(C94) [Fuwatoro★Marinepolis (Sumitomo)] Theater Challenge (THE IDOLM@STER MILLION LIVE!)

[Shokumu Taiman (Take)] Tougoux 3 (Yuuki Yuuna wa Yuusha De Aru) [English] [The Chrysanthemum Translations] [Digital]

Chotto dake Ai ga Omoi Dark Elf ga Isekai kara Oikakete Kita 3 | A Slightly Clingy Dark Elf Chased Me From Another World 3

(C92) [NxC Thermit (Nohito)] Konna ni mo Itooshii 1.5 (THE IDOLM@STER CINDERELLA GIRLS)

(C86) [Takemasaya (Takemasa Takeshi)] CINDERELLA ECSTASY Jouyoku no Catharsis | Cinderella Ecstasy - Lust Filled Catharsis (THE iDOLM@STER CINDERELLA GIRLS) [English] {doujin-moe.us}

(C81) [Mugenkidou A (Tomose Shunsaku)] Boku to Rinjinbu to Umi no Year [The Year At The Beach With Me And The Neighbors' Club] (Boku wa Tomodachi ga Sukunai [Haganai]) [English] [Trinity Translations Team + Team Vanilla]

(C89) [mon-petit (Mon-petit)] CinderellaStory EXTRASTAGE (THE IDOLM@STER CINDERELLA GIRLS)

(C89) [MoonPhase (Yuran)] Ichinose Shiki no Tanoshii Yume (THE IDOLM@STER CINDERELLA GIRLS)

(SPARK10) [Lr. (Motohashi Iyuu)] Shounen L wa Yokkyuu Fuman (Kekkai Sensen)

Gibo Ochi 1 | Fallen Stepmother 1

[Mitsuhashi Tomo] Choukyou Kaihatsu Seikatsu ~Kimi ga Ochiru Made Yamerarenai~ | 调教开发生活~不到你堕落为止决不罢休~ 1-7 [Chinese] [拾荒者汉化组] [Digital]

(MyBestFriends8) [DogStyle (Menea The Dog)] Hai-Couple rainstorm (THE IDOLM@STER CINDERELLA GIRLS) [Chinese] [嗶咔嗶咔漢化組]

(C91) [Shoot The Moon (Fuetakishi)] High Elf x High School Kamina-kun no 1-nichi

[Hashida Mamoru] Kikkake (COMIC Shingeki 2012-02) [Chinese] [Decensored] [Ongoing]

The Complete Sister Meal Set | Kanzen Shokuhouimo

My Son's Star Is His Own Mother

[Higedokoro (Alapi)] Schale Houshibu Katsudou Kiroku 2 -Hasumi, Yuuka, Ako Hen- | This Week's Record of Activities for the Schale Relief Club 2 ~The Hasumi, Yuuka and Ako Chapter~ (Blue Archive) [English] [head empty] [Digital]

[Othello Ice (shuz)] Atari ga Muchimuchi Onee-san!?

(COMIC1☆9) [The Seventh Sign (Kagura Yuuto)] Onsenkyou Ymir no Ichiban Amai Yoru (The Legend of Heroes: Sen no Kiseki)

[Akihiko] H na Onegai | Sex Please Ch. 1-6, 8-10 [English] [Amoskandy] [Decensored]

Hara Hara Dokei Final Calpis Theater 7:30

(COMIC1☆9) [The Seventh Sign (Kagura Yuuto)] Onsenkyou Ymir no Ichiban Amai Yoru (The Legend of Heroes: Sen no Kiseki)

COMIC Magnum X Vol. 21

Isekai Kita node Sukebe Skill de Zenryoku Ouka Shiyou to Omou 4Shame | I Came to Another World, So I Think I'm Gonna Enjoy My Sex Skills to the Fullest! 4th Shot

Haha Ana - Mother Hole

(C76) [Hashiya, Rengeza (Hashiyamoto, Inui Nui)] Zecchou Saiban - Climax Trial (Touhou Project)

[Goma Brothers (Gomabura)] Makio-kun Tanetsuki Oji-san to Ochinchin nanka ni Zettai Makenai Hon (THE iDOLM@STER SideM) [English] {Hennojin} [Digital]

[Narushima Godou] Okusama wa Idol

(C90) [The Seventh Sign (Kagura Yuuto)] Magical Alisa no Ichiban Hazukashii Yoru (The Legend of Heroes: Trails of Cold Steel)

(Tokimeki Party Sensation 6) [Shikkokuno J.P.S. (Hasumi Elan)] THE BASEMENT TAPES ELAN HASUMI BOOKLET

The Hero Father's Downfall Through Gender-Bending, in the Hands of his Son, the Demon Lord

(C92) [IMAKAN (Keigen Asuka)] Mahou Idol ♭ Chi-chan (THE iDOLM@STER)

(SC50) [Happy Paranoia, Shikkokuno J.P.S. (Wanashiro Giovanna, Hasumi Elan)] Blind god (The World God Only Knows)

(C71) [Saigado] THE ATHENA & FRIENDS 2006 (King of Fighters) [English] [SaHa]

(C80) [Arsenothelus (Rebis)] TGWOA 31 - Futari no Meikyuu Oujo V ~Haha Shimai no Soudatsukon~ | Twin Dungeon-Princesses Vol. 5 - Mother and Daughter Marriage Contest [English] {doujin-moe.us}

[Arsenothelus (Rebis)] Futari no Meikyuu Oujo 7 [Digital]