It's a manga about a little sister sucking on her big brother's penis
[lostlast (Yuki)] Adabana (Natsume's Book of Friends) [English] [Midnight Heaven]
(C86) [Super Flat Lolinitron (Focke Wolf)] "Tomodachi to no Sex." (One Week Friends)
[Anthology] LQ -Little Queen- Vol. 23 [Digital]
(C81) [Mugen@WORKS (Akiduki Akina)] Ware wa Tomodachi nado Iranu 2 | Friends are not a necessity 2 (Boku wa Tomodachi ga Sukunai) [English] [Rin]
(COMIC1☆11) [Kaki no Tane (Summer)] Kuubo Friends (Kantai Collection -KanColle-, Kemono Friends) [Chinese] [千鶴翻譯]
(COMIC1☆8) [Kikurage-ya (Kikurage)] Tomodachi ni Nattekudasai. | Please Be My Friend. (One Week Friends) [English] {Hennojin}
[RPG Company 2 (Yoriu Mushi)] R Shitei Ki ~Irumi to Hiroki~ | R-Shitei Play 1 - Little Night Crawling [English] [Digital]
(C87) [Super Flat Lolinitron (Focke Wolf)] "Tomodachi to no Sex no Tsuzuki." (One Week Friends)
[Anthology] Futanari Friends! 04
(SC20) [Saigado] Yuri & Friends Mai Special (King of Fighters) [English] [H-Manga Project]
(C93) [Beicon (Beijuu)] Thoroughbred Early Days | 早(找)日的骥女 (Kemono Friends) [Chinese] [BBBAT汉化组]
may Kemono Friends Thre Goudoushi 2
Return World 2
[Fuji Shinobu] Koakumalita | Little demon lolita [English] [Rin]
[Yukiu Con] Boku no Imouto wa Kawaii! | My Little Sister is So Cute! (COMIC RiN 2011-01) [English]
(COMIC1☆14) [squeezecandyheaven (Ichihaya)] Imouto wa Genius | My Little Sister Is a Genius [English] {Doujins.com}
[Zat] Twi to Shimmer no Ero Manga | The Manga In Which Sunset Shimmer Takes A Piss (My Little Pony: Friendship is Magic) [English]
(C84) [keepON (Hano Haruka)] Sister Complex! (Little Busters!)
(C81) [Makino Jimusho & friends] Syrup 18 + Winter 2011
[Porori] My First Time is with.... My Little Sister?! Ch.17
[Misagi Nagomu] The little sister bank Ch.1-3
(C92) [Coffee Maker (Asamine Tel)] Kemono no Iyashi (Kemono Friends) [Chinese]
Little Sister's Wonderful Suprise Visit [English] [Rewrite] [Bolt] [Decensored]
(SC2017 Summer) [Kowareta Radio (Herokey)] Kedamono Sex Friends (Kemono Friends)
Imouto Role Change | Little Sister Role Change
[Hoshino Fuuta] Little Twins Fantasy [English] [SaHa]
(C93) [Moe Moe Cafe (Takahashi Tetsuya)] Kitsune no Yuriiri (Kemono Friends)
Little Sister's Mosquito Paranoia Is Too Damn Cute
(C80) [Takanaedoko (Takanae Kyourin)] Imouto no Otetsudai | Little Sister's Helper [English] =Team Vanilla=
My First Time is with.... My Little Sister?!
Ore no Imo Oto | My Little Sisbro
(C92) [Tendoushi (Fukuroumori)] Daisuki ni Kimatteru!! (Kemono Friends)
My Little Sister [English] [Rewrite] [olddog51]
[Tomono Hiro] Hoshigari Girlfriends - Wanting Girl Friends | 一直想要GF [Chinese]
(C51) [Cu-little2 (Beti, MAGI)] Cu-Little!! (Various) [English]
The cute little sister gets mindbroken by the savage and gross elder brother's evil hands!
(C83) [Kouzaka-san to Makino Jimusho (Kouzaka Kouhei, Taki Minashika)] SISTERS -Natsu no Saigo no Hi- ART WORK (SISTERS -Natsu no Saigo no Hi-)
(COMIC1☆7) [Takanaedoko (Takanae Kyourin)] Imouto no Otetsudai 4 | Little Sister Helper 4 [English] {Hennojin}
(C92) [GT Works (GT)] Friends Choujuugiga (Kemono Friends)
[Little mantis (Kuloamaki)] Kaori [Digital]
[Atori K] Imouto Bloomer | Little Sister Bloomers Ch. 2 [English] [Yoshio]
Katchuu Densetsu
(Futaket 14.5) [Sakomicho (qzna)] Margay no PPP Management (Hululu-san to) (Kemono Friends)
(C80) [Haisui no Jin (Naruko)] Nanikore?! (Little Busters!)
[Mizuyoukan] My Little Sister ~Akane~ Special (Kunoichi Tsubaki Chinpouchou Chapter 10) [ENG] [Yoroshii]
It's the Little Sister's Duty to Take Care of Her Brother's Ejaclation!
(C95) [ASSAM (Asano)] Kanojo ga Nihon Ookami no Baai. (Kemono Friends)
[Ohnuma Hiroshi] Imouto Catalog | Little Sister Catalog (Comic LO 2016-03) [English] {Mistvern}
(C88) (Little★Cosmos [Ayano Rumi]) Netorare Oujo Lucina | Netorare Princess Lucina (Fire Emblem Awakening) [English] [mickeyj]
[Shinobu Tanei] Little Stepsister Love Space Ch. 1-9 [English] {Tadanohito}
[広肉ル] 男の娘フレンズ (Kemono Friends)
[Shinchara (YO-JIN)] BindLBR5 (Little Busters!) [Digital]
(Mimiket 36) [Testa Kitchen (Testa)] Serval-chan no Friends "Ijou" ni Naritai Hon (Kemono Friends) [Chinese] [无毒汉化组]
[Rasahan] Sister Friends Kouhen (Girls forM Vol. 13) [English] {Hennojin}
(Japariket) [Uto Saori] Jiai to Houyou no Megami Serval-chan (Kemono Friends)
[靴下男爵] さぁこれから Episode: 1 (描き直し) (One Week Friends)
(Japariket 3) [Eith] Ani na Yuri Chihou (Kemono Friends)
(C92) [Tohgoo (Fuyutugu)] Hakase Joshu no Kaikata (Kemono Friends)
(Japariket 2) [mocomocodo (Nukunuku Batten)] Ganbare PPP (Kemono Friends)
(C54) [Cu-little2 (Betty, MAGI)] Cu-Little Onemunya~ (Bakumatsu Roman Gekka no Kenshi)
(C92) [Tohgoo (Fuyutugu)] Hakase Joshu no Kaikata (Kemono Friends)
(C94) [Moe Moe Cafe (Takahashi Tetsuya)] Otona no Youchienji Kitakitsune (Kemono Friends) [Chinese] [绅士仓库汉化]
(COMITIA119) [Littleollie (Deburasu)] Uchi no Imouto wa Kotowaranai | My Little Sister Doesn't Refuse Me [English] [ATF]
(CR32) [Studio BIG-X (Arino Hiroshi)] Mousou Mini Theater 9 (Sister Princess)
Business-like na Imouto | Entrepreneurial Little Sister
My Big 'n' Sexy Little Sis
[Fuyuno Mikan] Chiisai Onnanoko ga Suki de Nani ga Warui! | What's Wrong with Liking Little Girls!? [English] [Rin]
[Shinooka Homare] Anta wa Atashi no Ottoman | Little Brother, You Are My Ottoman (Girls forM Vol. 09) [English] {5 a.m.}
[Kyuu Tekki Jidai (Q Kotetsu)] Yaseikaihou! Hanshokuki! (Kemono Friends) [Digital]
Kedamono Friends Surprise
[Happouvijin (yumoteliuce)] Tasting (Little Witch Academia) [Chinese] [沒有漢化] [Digital]
[Story Circle (Tonari)] Downer-kei Gamer Otouto ga Nii-san Sukisuki Imouto Succubus ni Naru made | From a Downer Gamer Little Brother♂ to a Little Sister♀ Succubus Who Loves Nii-san [English] [Panatical] [Digital]
[REDLIGHT] Otona no Ehon Akazukin-chan | Little Red Riding Hood’s Adult Picture Book [English] =Nashrakh+Nemesis=
[Little mantis (Kuloamaki)] Seku Pure!!!2 ~Sexual Predators~
(COMIC1☆11) [Nylon 100% (Nylon)] R18 RED DATA BOOK (Kemono Friends)
[Anthology] Little Girl Strike Vol. 3
(COMITIA119) [Littleollie (Deburasu)] Uchi no Imouto wa Kotowaranai [Chinese] [山樱汉化]
Little Titty [English] [Rewrite]
[Sakuragi Rian (Cynthia)] Oinarisama vs Shokushu (Kemono Friends) [Digital]
Sister Friends Kouhen {Hennojin}
Imouto no Otetsudai 8 | Little Sister Helper 8
[18 monkeys (Inono)] Meganekko no Imouto to Kindan no aa... uu... (Meganekko Little Sister & Forbidden AAH) [English] {SaHa}
(C88) [Little★Cosmos (Ayano Rumi)] Netorare Oujo Lucina | Netorare Princess Lucina (Fire Emblem Awakening) [English] [mickeyj]
[Anthology] LQ -Little Queen- Vol. 36 [Digital]
[Anthology] LQ -Little Queen- Vol. 4 [Digital]
[Porori] My First Time is with.... My Little Sister?! (Ongoing)
(C92) [squeezecandyheaven (Ichihaya)] Imouto wa Amnesia close | My Little Sister Has Amnesia - close (Shoujo no A ~squeezecandyheaven Soushuuhen~) [English] [ATF]
[Porori] My First Time is with.... My Little Sister?! Ch.18
Boku no Onee-chan to Tomodachi wo Nemurasete Osottemitara Kaeriuchi ni Atta | The Tables were Turned when I tried to Rape my Sister and her Friends while they were Asleep
[Atori K] Imouto Bloomer Ch. 2 | Little Sister Bloomers [English] [Yoshio] [Decensored] [Color Victor DoUrden]
(C53) [Cu-little2 (Betty, MAGI, Mimikaki)] Cu-Little Bakanya~ (Final Fantasy VII, Vampire Savior / Darkstalkers) [English]
[Porori] My First Time is with.... My Little Sister?! Ch.14
[Little mantis (Kuloamaki)] Rojiura no Elo [Digital]
(C95) [Gohanya (Hiromaji)] AARDCERULEANWOLF (Kemono Friends)
(COMIC1☆11) [REI's ROOM (REI)] Hatsujou Friends. (Kemono Friends)
Imouto Comp | little sister complex
[Marneko] Futa Imouto (Futanari Friends! 02) [Chinese] [瑞树汉化组]
(C60) [Cu-little2 (Beti, MAGI)] Cu-Little Ponkotsu Nya~ (Various)
[Union of the Snake (Shinda Mane)] Psychosomatic Counterfeit EX- A.J. in E.G. Style (Ver. 02) (My Little Pony: Friendship Is Magic)
[Nanase Mizuho] Older Sister Little Brother Older Sister Ch. 1-2 [English][Decensored]
[Anthology] LQ -Little Queen- Vol. 30 [Digital]
Imouto Netsuai Ryouiki | Little Stepsister Love Space Ch. 1-3
(HaruCC17) [Aotsukitei (Aotsuki Ren)] Tadashii Naoshikata. (Natsume's Book of Friends) [English] [OrangeRei]
(SC2017 Summer) [Magetarudou (Danchino)] Aurochs-san ni Oshiete Ageyou (Kemono Friends)
(Futaba Gakuensai 12) [GASOBook!! (Matsumomo Mahiru)] Tsuchinoko-san ni Japari Coin Ikko Ireru! (Kemono Friends)
(C54) [Cu-little2 (Betty, MAGI)] Cu-Little Onemunya~ (Bakumatsu Roman Gekka no Kenshi [The Last Blade])
Kedamono Friends Surprise
[Mugen@works (Akiduki Akina)] Ware wa Tomodachi Nado Iranu | Friends are not a necessity (Boku wa Tomodachi ga Sukunai) [English] [Rin] [Digital]
(C94) [Beicon (Beijuu)] Thoroughbred Early Days 2 (Kemono Friends) [English] [Roadwarior2] [Digital]
(SC2017 Winter) [CHIBIKKO KINGDOM (Kekocha)] Sekiyuou no Friends ga Doubutsuen o Tsukutta no de Itte Kita. (Kemono Friends) [Chinese] [K莫諾湖戀組]
[Applecat (Potekoro)] Little My Sister (Makai Tenshi Jibril) [Chinese] [佳奈助汉化] [Digital]
[Little mantis (Kuloamaki)] Nioi Sumire [Digital]
[Magukappu (Magukappu)] DIACO (Little Witch Academia)
[MR] Chounyuu Shoebill-chan no Junyuu Tekoki (Kemono Friends)
Imouto wa Mesu Orc 4 | My Little Sister is a Female Orc 4
[Porori] My First Time is with.... My Little Sister?! Ch.20
(C81) [MTD (Rei)] Nanibun Kyouiku Naka na Mono de (Natsume's Book of Friends)