List:

Romanized:
Original: うごく!ペコリン Part1
Circle: Knockout / KNOCKOUT
Author: Minazuki Juuzou, USSO / 水無月十三, USSO
Parodies: Girls und Panzer
Type: Doujin Movie Pages: 20 Adult: Yes
Score: - (0) Date: 2017-12-31 Modified: 2017-12-24

Romanized:
Original: お尻でキュッ! 2
Circle: Knockout / KNOCKOUT
Author: 南野たぬき, (and more), HOT, Tachibana Kaoru, USSO... / 南野たぬき, 他, HOT, たちばなかおる, USSO...
Parodies: Original
Type: Doujinshi Pages: 86 Adult: Yes
Score: - (0) Date: 1995-08-20 Modified: 2018-01-03

Romanized:
Original: バイト先のメガネっ娘JKが極太バイブオナニーマニアのド変態で俺のツボだった
Circle: Knockout / KNOCKOUT
Author: Ez6, USSO
Parodies: Original
Type: Doujin CG Pages: 36 Adult: Yes
Score: - (0) Date: 2015-12-31 Modified: 2017-05-07

Romanized:
Original: ペットボトル倶楽部 4
Circle: Knockout / KNOCKOUT
Author: Chuushin Kuranosuke, Minazuki Juuzou, Sasaki Mu... / 忠臣蔵之介, 水無月十三, 榊村正, USSO
Parodies: Busou Renkin, Original
Type: Doujinshi Pages: 10 Adult: Yes
Score: - (0) Date: 2006-12-31 Modified: 2018-05-13

Romanized:
Original: 少女拡張
Circle: Knockout / KNOCKOUT
Author: Bosshi / ぼっしぃ
Parodies: Original
Type: Doujin Movie Pages: 33 Adult: Yes
Score: - (0) Date: 2016-08-14 Modified: 2016-12-03

Romanized:
Original: 異世界肉奴隷アイドル(前編) ~2人のアイドルが異世界召喚でみだらな肉奴隷に堕ちるまでの物語~
Circle: Knockout, YURIRU-RARIKA / KNOCKOUT, ユリルラリカ
Author: Kojima Saya, USSO / 小島紗, USSO
Parodies: Original
Type: Doujin Soft Pages: 0 Adult: Yes
Score: - (0) Date: 2019-08-12 Modified: 2019-08-15

Romanized:
Original: 調教済み変態JKをさらに奥まで拡張調教しよう!!!
Circle: Knockout / KNOCKOUT
Author: Ez6
Parodies: Original
Type: Doujin Movie Pages: 0 Adult: Yes
Score: - (0) Date: 2017-08-13 Modified: 2017-08-11

Romanized: Ana Senchi
Original: アナセンチ
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: (unknown)
Type: Doujinshi Pages: 28 Adult: Yes
Score: - (1) Date: 2004-12-30 Modified: 2018-02-19

Romanized: Ana Senchi 5
Original: アナセンチ5
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: 【needs specifying】 Pachinko/Pachislot
Type: Doujinshi Pages: 36 Adult: Yes
Score: - (1) Date: 2011-08-14 Modified: 2018-02-19

Romanized: Bishoujo Anal Choukyou Nikki
Original: 美少女アナル調教日記
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: (unknown), Samurai Spirits
Type: Doujinshi Pages: 0 Adult: Yes
Score: - (0) Date: 1999-08-15 Modified: 2014-08-17

Romanized: Chougokubuto
Original: 超極太
Circle: Knockout, Nicomark / KNOCKOUT, にこまあく
Author: Aita Nikov, Anino Kazuya, Bosshi, Chuushin Kura... / あいたにこふ, 兄乃かずや, ぼっしぃ, 忠臣蔵之介, 渕田杏, 藤咲真, はるきゲにあ, ヒ...
Parodies: (unknown), Azumanga Daiou, Demonbane, Dirty Pai...
Type: Doujinshi Pages: 72 Adult: Yes
Score: 10 (5) Date: 2006-08-13 Modified: 2018-02-19

Romanized: Fist-fuck no Hon
Original: フィストファックの本
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Doujinshi Pages: 58 Adult: Yes
Score: - (0) Date: 1998-08-16 Modified: 2014-08-17

Romanized: GOKUBUTO
Original: 極太
Circle: Gelpin Tinta Ponta, Knockout / ゲルピンちん太ぽん太, KNOCKOUT
Author: Chuushin Kuranosuke, Imaki Hitotose, Inoue Kiyo... / 忠臣蔵之介, 新春夏秋冬, 胃之上奇嘉郎, 水無月十三, MINE, NeWMeN, 佐原一光...
Parodies: 【needs specifying】 Various, Cardcaptor Sakura, ...
Type: Doujinshi Pages: 52 Adult: Yes
Score: - (2) Date: 2001-08-12 Modified: 2018-08-10

Romanized: Izumi-chan Kimochi Ii kara Yamerarenaai !
Original: いずみちゃん 気持ちイイからやめられなぁい!
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Unknown Pages: 26 Adult: Yes
Score: - (0) Date: 2013-08-10 Modified: 2014-08-17

Romanized: JUNKS Hard Edition
Original: JUNKS Hard Edition
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Doujinshi Pages: 24 Adult: Yes
Score: - (0) Date: 1993-07-11 Modified: 2018-01-02

Romanized: Kakuchou Senkan Yamato
Original: 拡張戦艦ヤマト
Circle: Gelpin, Knockout / ゲルピン, KNOCKOUT
Author: Minazuki Juuzou, Nikusyo, USSO / 水無月十三, にくしょ, USSO
Parodies: Uchuu Senkan Yamato 2199
Type: Doujinshi Pages: 36 Adult: Yes
Score: 8.33 (3) Date: 2013-04-28 Modified: 2018-02-19

Romanized: Kinbaku Hihoukan Daiisshuu
Original: 緊縛秘宝館 第一集
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: (unknown), Mx0
Type: Doujinshi Pages: 32 Adult: Yes
Score: - (1) Date: 2007-12-31 Modified: 2019-02-13

Romanized: Moshi Koukou Yakyuu no Joshi Manager ga Kakuchoukei no [Management] wo Yondara
Original: もし高校野球の女子マネージャーが拡張系の『エロ同人誌』を読んだら
Circle: Gelpin, Knockout / ゲルピン, KNOCKOUT
Author: Bakuchin, Minazuki Juuzou, USSO / ばくちん, 水無月十三, USSO
Parodies: Moshidora
Type: Doujinshi Pages: 28 Adult: Yes
Score: - (0) Date: 2011-05-01 Modified: 2018-02-19

Romanized: Oden Musume
Original: おでん娘
Circle: Knockout / KNOCKOUT
Author: (unknown), Haruki Genia, Minazuki Juuzou, USSO / 不詳, はるきゲにあ, 水無月十三, USSO
Parodies: Sukatto Golf Pangya
Type: Doujinshi Pages: 36 Adult: Yes
Score: - (0) Date: 2005-12-30 Modified: 2021-10-03

Romanized: OnaBon!
Original: おなポン!
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: 【needs specifying】 Various
Type: Doujinshi Pages: 76 Adult: Yes
Score: - (0) Date: 1994-12-30 Modified: 2014-08-17

Romanized: OnaBon! 4
Original: おなポン!4
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Doujinshi Pages: 32 Adult: Yes
Score: - (1) Date: 2003-12-30 Modified: 2014-09-02

Romanized: OnaBon! 6
Original: おなポン!6
Circle: Knockout / KNOCKOUT
Author: (unknown) / 不詳
Parodies: VOCALOID
Type: Doujinshi Pages: 36 Adult: Yes
Score: - (1) Date: 2009-08-19 Modified: 2018-02-19

Romanized: Oshiri de Kyu ! (Saihanban)
Original: お尻でキュッ! [再版版]
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Doujinshi Pages: 194 Adult: Yes
Score: - (0) Date: 1994-08-08 Modified: 2015-07-10

Romanized: Oshiri De Kyu! 2
Original: お尻でキュッ! 2
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Doujinshi Pages: 88 Adult: Yes
Score: - (0) Date: 1996-12-21 Modified: 2010-05-08

Romanized: Oshiri De Kyu! 4
Original: お尻でキュッ! 4
Circle: Knockout / KNOCKOUT
Author: USSO
Parodies: Original
Type: Doujinshi Pages: 68 Adult: Yes
Score: - (0) Date: 1996-08-04 Modified: 2010-05-08