It's a manga about a little sister sucking on her big brother's penis
(C92) [Coffee Maker (Asamine Tel)] Kemono no Iyashi (Kemono Friends) [Chinese]
(COMIC1☆11) [Hi-PER PINCH (clover)] Otona no Japari Manko! (Kemono Friends)[Chinese] [沒有漢化]
(Mimiket 36) [Testa Kitchen (Testa)] Serval-chan no Friends "Ijou" ni Naritai Hon (Kemono Friends)
[Sennomori Maitake] Kaban-kun (Kemono Friends)
(Puniket 35) [ACID CLUB (nagare)] JapariCafe de Gokyuukei (Kemono Friends)
(C78) [MTD (Rei)] Utsurundesu | Infectious (Natsume's Book of Friends) [English] [Sugar Parade]
[Atori K] Imouto Bloomer Ch. 2 | Little Sister Bloomers [English] [Yoshio] [Decensored] [Victor DoUrden Colors]
(COMIC1☆14) [squeezecandyheaven (Ichihaya)] Imouto wa Genius | My Little Sister Is a Genius [English] {Doujins.com}
Imouto Koukan | Little Sister Exchange
[Union of the Snake (Shinda Mane)] Psychosomatic Counterfeit EX- A.J. in E.G. Style (Ver. 02) (My Little Pony: Friendship Is Magic)
[Porori] My First Time is with.... My Little Sister?! Ch.05
(C82) [HOT LIMIT (Shitsuki Aya)] Masquerade (Natsume's Book of Friends)
[Ohnuma Hiroshi] Imouto Catalog | Little Sister Catalog (Comic LO 2016-03) [English] {Mistvern}
(SC2017 Winter) [Waffle Doumeiken, Hirahira (Tanaka Decilitre, Hirari)] Kedamono Friends (Kemono Friends)
(COMIC1☆11) [Digital Lover (Nakajima Yuka)] D.L. action 115 (Kemono Friends) [English] {atomicpuppy}
[Shinobu Tanei] Imouto Netsuai Ryouiki | Little Stepsister Love Space Ch. 1-3 [English] {Tadanohito}
[Mentaiko Umai (Sawara)] Kedamono Damono (Kemono Friends) [Digital]
Ore ga OreImo no Doujin wo Kakanai Wake ga Nai
[Kanmi Ryoutei (Amami Dashitare)] Maeshippo ga Haeta Dekkai Onee-san Friends-tachi ni Chikubi mo Oshiri mo Kawaigararete Mesu ni Nacchau Taichou-san (Kemono Friends) [Digital]
(C92) [Akatsuki Katsuie no Circle (Akatsuki Katsuie)] Little Bitch Academia (Little Witch Academia)
(C80) [ArcS (Sakura Yuu)] Snow Thaw (Infinite Stratos) [English] =Little White Butterflies=
[Anthology] COMIC L.Q.M ~Little Queen Mount~ Vol. 3 [Digital]
[Urutsu] My Little Sister Is Too Cute★ (Forbidden Sisters) [English] (yuriproject)
(Futaba Gakuensai 12) [GASOBook!! (Matsumomo Mahiru)] Tsuchinoko-san ni Japari Coin Ikko Ireru! (Kemono Friends)
(C92) [SAZ (Onsoku Zekuu)] Kemonogatari Tsuika (Kemono Friends)
[Aki to Haru no Yume (Akinaro)] Shojo-chan Muchimuchi desu kedo? (Kemono Friends)
[Kanro Ame] Imouto Culture Shock! | Little Sister Culture Shock (Comic LO 2014-11) [English] [5 a.m.]
[Ikaruganomiya (Umayadono Ohji)] Kinshin Soukan Kinki 5(Sister Princess)
(C84) [Tennenseki (Suzuri)] SUN SUN Kud (Little Busters!) [Chinese] [寂月汉化组]
[Tanabe Kyou] Imouto no Iu Toori | As My Little Sister Says (COMIC Megastore Alpha 2015-06) [English] [Facedesk]
Imouto Downgrade | Little Sister Downgrade
[Minasuki Popuri] Fuari-chan Tensai Tensai | Fuari-chan, The Little Genius (Comic LO 2013-9) [English]
[Juna Juna Juice] Mukatsuku Imouto wa Chanto Shikaranakucha 1~5 Matome | Annoying Little Sister needs to be Scolded [English] [NovaScans]
[Porori] My First Time is with.... My Little Sister?! (Ongoing)
(C93) [Moe Moe Cafe (Takahashi Tetsuya)] Kitsune no Yuriiri (Kemono Friends)
My First Time is with.... My Little Sister?! Ch.19
[Zat] Twi to Shimmer no Ero Manga (My Little Pony: Friendship is Magic) [Chinese] [星翼汉化组]
[Little mantis (Kuloamaki)] Aishi~Play [Digital]
[Aki to Haru no Yume (Akinaro)] Muchimuchi da ne Alpaca-chan | Clueless Alpaca-chan (Kemono Friends) [English] [OTHC]
(C94) [squeezecandyheaven (Ichihaya)] Imouto to Sex Suru nante Kimochi Warui | Having Sex With Your Little Sister? That's Gross! [English] [sneikkimies]
[Itaba Hiroshi] Imouto to Yatte Shimattashi, Imouto no Tomodachi to mo Yatte Shimatta Ch.1-8 | I had sex with my sister and then I had sex with her friends Ch.1-8 [English] [KittyKatMan] [Digital]
[Shinobu Tanei] Little Stepsister Love Space Ch. 1-2 [English] {Tadanohito}
[Fensu 14] ふたなりかばんちゃん落書き漫画 (Kemono Friends)
(C85) [keepON (Hano Haruka)] Otona ni Nante Naritakunai! (Little Busters!)
[Little mantis (Kuloamaki)] Rojiura no Elo [Digital]
(C90) [Sesso Minus (Sesso Nashiko)] Akazukin-chan to Harapeko Ookami-san (Little Red Riding Hood) [Chinese] [洗白白个人汉化]
(C58) [Cu-little2 (Beti, Magi)] Cu-Little Wannyannya~ (Breath of Fire IV) [Colorized] [Incomplete]
[tengohambre (Sueyuu)] Kotsume-chan Asobou | Otter-chan, let's play (Kemono Friends) [English] [Kappasa] [Digital]
(SC2017 Winter) [Waffle Doumeiken, Hirahira (Tanaka Decilitre, Hirari)] Kedamono Friends (Kemono Friends) [Chinese] [Kanade汉化组]
(Tora Matsuri 2010) [Raijinkai (Haruki Genia)] Oreimo Binetsu Tyuihou 1 | Little Sister Fever Warning 1 (Ore no Imouto ga Konna ni Kawaii Wake ga Nai) [English] =Team Vanilla=
My First Time is with.... My Little Sister?! Ch.26
[Zat] しままんまんが (My Little Pony: Equestria Girls)
[Little mantis (Kuloamaki)] Seku Pure!!!3 ~Sexual Predators~ [Chinese] [臭鼬娘漢化組]
[Mikko] Little Sister Absolute [Ongoing]
[Porori] My First Time is with.... My Little Sister?! Ch.14
[Juan Gotoh] Soukan no Yoru | Incest Night (Zenra Inkou Sengen!!) [Chinese] [魔劍个人汉化] [Digital]
Friends ga Iru Fuuzoku ga Arutte Hontou desu ka? Sugoi! Kimi wa Koubi ga Tokui na Friends Nanda ne! Hen
(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]
(C81) [MTD (Rei)] Nanibun Kyouiku Naka na Mono de (Natsume's Book of Friends)
[Mugen@works (Akiduki Akina)] Ware wa Tomodachi Nado Iranu | Friends are not a necessity (Boku wa Tomodachi ga Sukunai) [English] [Rin] [Digital]
[Atori K] Imouto Bloomer Ch. 2 | Little Sister Bloomers [English] [Yoshio] [Decensored] [Color Victor DoUrden]
[Yosutebito na Mangakaki (Tomoki Tomonori)] Osoware Nureru Ehon no Shoujo (Various) [English] [q91] [Digital]