How about the cleaning lady?
(Reitaisai 13) [Lapiz Lazuli Kouseki (Kuroha Rapid)] Jigoku no Megami no Aiganbaku (Touhou Project) [English] {Hennojin}
First Time Experience with Aoi-san
Human-lovers Committee
[Kesshousui] Hitokui Nezumi no Jintai Jikken | The Human Experiment with Man-Eating Rats [English] [desudesu]
Professor of the Cow God 2
Tomodachi to Jikken Shite Miru Hon. Kouhen | A book about experimenting with your friend, part 2
Rie Petoriyacowa Suikan
(C90) [Uma no Hone (Toba Yuga)] Oikawa-san no Oppai Shibori (THE IDOLM@STER CINDERELLA GIRLS)
Ridem Cowgirl [English] [Rewrite] [EZ Rewriter]
(C71) [Xration (mil)] Maji Love 2 (Ragnarok Online) [English] [cowsrkool]
a dairy cow's life
[Toriaezu. (Kitsunekov)] FOX MANIAX [English] [Vi6 D Dark King]
[Pon Takahanada] Love Gome! Ch. 3 [English] [cowsrkool]
Dude, I turned into a Cowgirl?!
Rape Experiment
Ane Taiken Shuukan | The Older Sister Experience for a Week ch. 1-5
[Yumano Yuuki] Mutant Cow Factory (Rewrite)
(Douyara Deban no Youda! 12) [tacowasa (HYE)] Koi ni Tomadou. (Boku no Hero Academia) [English] [Otokonoko Scans]
(C81) [Type-G (Ishigaki Takashi)] Chifuyu de Pon! (IS <Infinite Stratos>) [English] [cowsrkool]
[Michiking] Ane Taiken Jogakuryou 1-3 | Older Sister Experience - The Girls' Dormitory [English] [Yuzuru Katsuragi] [Digital]
Cow Gyuunyuu
(C72) [Ocarina (Dyontairan)] Cowaremono #7 (Various)
The Cow Demon
COMIC Unreal 2017-12 Vol. 70 [Digital]
[Imomaru. (Kenpi)] Haiboku Saiin Shuuhen (Touhou Project) [Digital]
(C75) [Kouyadou (Mizuki Eimu)] Ganzfeld Experiment (Telepathy Shoujo Ran)
[Mink] [Full Color Seijin Han] Yakin Byoutou・San Experiment.2 Complete Ban [Digital]
(C54) [K.S. Ozaki (Various)] G-SHOCK Vol. 6 (Cowboy Bebop, Rival Schools, Shoujo Kakumei Utena)
(Aka no Hiroba 12) [komorikiri. (Urin)] Orin To Okuu no Seikan Oil Massage Taikenki | A Story about Orin and Okuu's Sensual Oil Massage Experience (Touhou Project) [English] [FoF]
[Fujiiro Bomber (Kyouka)] Holstein Sanae-san (Touhou Project) [English] [Digital]
Echi Echi Kouhai-chan!
[Katou an] Fushidara na Junai -Toshishita Danshi ni Netorarete...- Ch. 4 (COMIC Ananga Ranga Vol. 52) [Chinese] [翻车汉化组]
She's The Girl
[Michiking] Ane Taiken Jogakuryou 1-11 | Older Sister Experience - The Girls' Dormitory [English] [Yuzuru Katsuragi] [Digital]
[Takase Tsukasa] Me and my Uncle’s Sonnet [Eng]
YUKIMILK
[Pon Takahanada] Love Gome! Ch. 5 [English] [cowsrkool]
(C86) [Dr. VERMILION (Petenshi)] EXPERIMENT (Toaru Kagaku no Railgun) [Chinese] [lordsky29個人漢化&game8210整合]
(COMIC1☆10) [Shin Hijiridou Honpo (Hijiri Tsukasa)] Mizu o Kaburu to Onna ni Nacchau Fuzaketa Taishitsu. | The Messed Up Experience of Being Covered In Water And Turned Into a Girl (Granblue Fantasy) [English] [Doujins.com]
[Shono Kotaro] Houkago Experience | Afterschool Experience (COMIC Masyo 2014-04) [English] {Crystalium}
COMIC Unreal 2016-12 Vol. 64
[Michiking] Ane Taiken Jogakuryou 1-5.5 | Older Sister Experience - The Girls' Dormitory [English] [Yuzuru Katsuragi] [Digital]
Inma made Aru
(Ashipita!! 8) [Neko to Hato (Hatoya Mameshichi)] Home Sweet Home (Goblin Slayer) [English] [Thennos Scans]
[Kanno Takashi] Alien Experiment (COMIC Orga Vol. 01) [Chinese] [牛肝菌汉化]
(SUPER23) [Kokon no Kaze (raipanda)] Ushi Mako-chan no Yuuutsu (Free!)
[Penguindou] G-class III [Digital]
(C58) [BLACK DOG (Kuroinu Juu)] GOLD EXPERIENCE (Bishoujo Senshi Sailor Moon) [Chinese] [Incomplete]
愛の証明
Kono Mujintou ni wa Tabemono ga Ecchi na Kajitsu Shika Nai...... tte Koto!?
(Todoroku Bakuon Rhapsody DR2021) [Holy Cow (ichika)] Between the Sheets (Boku no Hero Academia)
(C87) [Condiment wa Hachibunme (Maeshima Ryou)] Happiness experience2 (HappinessCharge Precure!) [Chinese]