One night, a succubus name Lily appears before a male student named Lui. When Lui turns down her advance to do something sexual, she possesses his body saying, “I’ll soften up your spirit and body a bit,” turning him into a girl. After that, Lily controls his body making him masturbate, have sex with friends and does whatever she likes...
 
(Source: Fakku)

Sequel of "Soften up♀ a stiff you♂". Lui, an earnest high school boy, is turned into a girl after being possessed by a succubus named Lily. 
Furthermore, with Lily’s power, Lui’s surrounding environment is altered as if he has always been a girl, in which he reluctantly lives as now. Due to Lily’s influence, Lui can’t suppress his sexual desire resulting in masturbating and having sex with his former best friend from when he was a boy. As he repeats these things, gradually a change in heart also begins to show...
 
(Source: Fakku)

Collection of stories dealing with gender change, written by F (TSF no F) and drawn by various doujin artists.
 
 
Sono 1 (2014/12/30) 
Cover Illustration: Yotsuba Chika 
1. Ore ga Otaku(♂) no Koibito(♀) ni Naru Nante... (俺がオタク♂の恋人♀になるなんて…) by Yotsuba Chika 
2. Ore ga Onna ni Natta Hi (俺が女になった日) by Aichi Shiho 
3. Tou-san Mago no Kao ga Mitaitte Itta yo ne? (父さん孫の顔が見たいっていったよね?) by Naba 
4. Cosplay Swap (こすぷれすわっぷ) by Taniguchi-san
 
 
Sono 2 (2015/12/31) 
Cover Illustration: Yotsuba Chika 
1. Kojin Jouhou wa Taisetsu ni (個人情報は大切に) by Yotsuba Chika 
2. Eroge na Hibi (エロゲな日々) by Labui 
3. Waga Tsuma to Nare Yuusha(♂) yo (我が妻となれ勇者♂よ) by Aji Pontarou 
4. Imouto Exchange (妹えくすちぇんじ) by Mori Airi 
5. Tokushu na Kanojo to Tsukiau Houhou (特殊な彼女と付き合う方法) by Quu 
6. Ore, Atashi, Watashi (俺、アタシ、私) by Kamiya Zuzu 
7. Gal-iro ni Somaru (ギャル色に染まる) by Hyouga.
 
 
Sono 3 no Jou (2016/12/31) 
Cover Illustration: Yotsuba Chika 
1. Ochiru Ouji: α to ω (堕ちる王子 -α to ω-) by Yotsuba Chika 
2. Imouto Downgrade (妹だうんぐれーど) by Murasakiiro Orange 
3. Kikaijikake no Eve: Chapter 1 (機械仕掛けのイブ 第1話) by Haruno Suzune 
4. Ore no Osananajimi ga Seitenkan ni Urusai. (俺の幼馴染が性転換にうるさい。) by Taniya Raku 
5. Boku wa Succubus? (僕はサキュバス?) by Kurimochi Chizuru
 
 
Sono 3 no Ge (2017/08/13) 
Cover Illustration: Kurimochi Chizuru 
1. Ore wa Succubus Minarai? (俺はサキュバス見習い?) by Kurimochi Chizuru 
2. Gal-iro ni Someagaru (ギャル色に染め上がる) by Hyouga. 
3. Kikaijikake no Eve: Chapter 2 (機械仕掛けのイブ 第2話) by Haruno Suzune 
4. OtaCir no TS Hime wa Kawaii toiu Kotoba ni Yowai (オタサーのTS姫はかわいいという言葉に弱い) by Byakuya Yuu 
5. Fukushuu no Yubiwa (復讐の指輪) by Nomu 
6. Imouto Idolize (妹あいどらいず) by Kagura Kurumi 
7. Mio TS Dorei Oni (身堕TS奴隷鬼) by Uno Ryoku 
8. Eien ni Kimi to (永遠に君と) by Natsumori Fukagasa
 
 
Sono 4 (2017/12/31) 
Cover Illustration: Yotsuba Chika 
Illustration: Hoshino 
1. TS Mahou Shoujo Hiromi: Chapter 1 (TS魔法少女ひろみ 第1話) by Yotsuba Chika 
2. Ore ga Osananajimi no Koibito ♀ ni Naru Nante Zettai Arienai (俺が幼馴染みの恋人♀になるなんて絶対ありえない) by Hoshina Meito 
3. Joou no Kisaki ni Sareta Ore (女王の妃にされた俺) by Nemuri Neko Shirou 
4. Onna tte Raku de Ii yo na (女って楽でいいよな) by Poriuretan 
5. Musunde Hodoite (結んでほどいて) by Hoshino
 
 
Sono 5 (2018/12/31) 
Cover Illustration: Yotsuba Chika 
Illustration: Kurimochi Chizuru 
1. TS Mahou Shoujo Hiromi: Chapter 2 (TS魔法少女ひろみ 第2話) by Yotsuba Chika 
2. End:less Nightmare: Chapter 1 by Murasakiiro Orange 
3. Inoue-kun no Jijou (井上くんの事情) by Rustle 
4. Shoujo stay night (少女/Stay Night) by Taniguchi-san 
5. Fukanyou no Daishou (不寛容の代償) by Nomu 
6. Trans Blood (トランス・ブラッド) by Kaneko Naoya 
7. Mezame (めざめ) by Kanoe 
8. Succubus ♀ ni Kyousei Tenshoku Saserareta Ore ♂ (サキュバス♀に強制転職させられた俺♂) by Hoshina Meito 
9. Ore ga Osananajimi no Koibito ♀ ni Naru Nante Zettai Arienai: After by Hoshina Meito
 
 
Sono 6 (2019/08/11) 
Cover Illustration: Yotsuba Chika 
Illustration: Reitou Mikan, Etami 
1. TS Mahou Shoujo Hiromi: Chapter 3 (TS魔法少女ひろみ 第3話) by Yotsuba Chika 
2. Toshiue e no Doukei (年上への憧憬) by Nomu 
3. Seikishidan Jewel Knights: Chapter 1 (聖騎士団 ジュエルナイツ 1話) by Kouji 
4. Nikusa Amatte Kawasa Hyakubai! (憎さ余って可愛さ百倍!) by Yonezou 
5. Saimin Choukyou Eroge no Heroine ni Tensei Shite shimatta Ore wa Kouryaku Sarezu ni Nigekiritai! (催眠調教エロゲのヒロインに転生してしまった俺は攻略されずに逃げきりたい!) by Reitou Mikan 
6. Haruka Kanata (ハルカカナタ) by Morishita Mao 
7. Yuusha to Maou Gense de JK Yattemasu! (勇者と魔王現世でJKやってます!) by Kaneko Naoya 
8. TS Musume ni Natte Onnanoko to Ichaicha shitai kedo Hazukashikute Dekinai node ̄Ichioshi shite kure (TS娘になって女の子とイチャイチャしたいけど恥ずかしくてできないので一押ししてくれ) by Fukuoka Taro
 
 
Sono 7 (2019/12/30) 
Cover Illustration: Nomu 
1. Imouto VR (妹ぶいあーる) by Nomu 
2-4. Seikishidan Jewel Knights: Chapters 2-4 (聖騎士団 ジュエルナイツ 2話-4話) by Kouji 
5. Mesuinu Falling (メス犬 Falling) by Kanmuri
 
 
Sono 8 (2020/09/20) 
Cover Illustration: Nomu 
1. Shouwaru Iinchou(♂) wo M-jouka Choukyou (性悪委員長♂をM女化調教) by Nomu 
2. Yakyuubu no Moto Ace(♂) wa Sei Shori Pet(♀) (野球部の元エース♂は性処理ペット♀) by Nomu 
3. Trans Conversion Case. I (トランス・コンバージョン Case.I) by Kamiya Zuzu 
4. Maou wo Kyuusai suru Houhou (魔王を救済する方法) by Mugen no Sudadokei 
5. Mikai no Kotou de Buzoku no Ichiin♀ ni Natte Shinyuu no Yome ni Natta Ohanashi (未開の孤島で部族の一員♀になって親友の嫁になったお話) by Hiiragi Popura 
6. Kisekae Appli de Kawaiku Henshin! (着せ替えアプリでかわいくへんしん!) by Sasami
 
 
Sono 9 (2021/12/31) 
Cover Illustration: Yotsuba Chika 
1. Kitsune e Yomeiri (狐へ♂→♀嫁入り) by Yotsuba Chika 
2. Imouto Role Change (妹ろーるちぇんじ) by Nomu 
3. Sonzai Kaihen Appli: Jibun no Imouto ni Kaerareta Ore (存在改変アプリ～自分の妹に変えられた俺～) by Nomu 
4. Inma Abrahel Koutan (淫魔アブラヘル降誕) by Mugen no Sudadokei 
5. Onna ni Natta Ore wa Shinyuu no Risou no Kanojo? (女になった俺は親友の理想のカノジョ?) by Betty 
 
 
Sono 10 (2022/12/31) 
Cover Illustration: Hiiragi Popura 
1. Yuusha Aku ni Ochiru: Ryuu Hime Meifa no Kakusei (勇者悪に堕ちる～龍姫メイファの覚醒～) by Hiiragi Popura 
2. Okatai Anata♂ wo Yawarakaku♀ (おかたいアナタ♂をやわらかく♀) by Betty 
3. Okatai Anata ♂ wo Moto Yawarakaku ♀ (おかたいアナタ♂をもっとやわらかく♀) by Betty 
4. Fumajime Yuusha no Saikyouiku (不真面目勇者の再教育) by Betty 
5. Ubawareta Tachiba ~Ou Kara Ouhi Eto Kaerareta Ore (奪われた立場～王から王妃へと変えられた俺～) by Betty 
6. CosChan! Cosplay Gal♀ ni Kaerareta Boku♂ (こすちぇん! コスプレギャル♀に変えられた僕♂) by Kagura Kurumi 
 
 
Sono 11 (2023/08/13) 
Cover Illustration: NOMU 
1. Gal-kei Joshi ni Kakikaerareta Ore (ギャル系女子に書き換えられた俺) by NOMU 
2. Okatai Anata ♂ wo Sukkari Yawarakaku ♀ (おかたいアナタ♂をすっかりやわらかく♀) by Betty 
3. Kagami no Naka ni Utsuru no wa 〜Inma ♀ ni Hantenshita Seishokusha ♂〜 (鏡の中に映るのは 〜淫魔♀に反転した聖職者u♂〜) by Betty

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