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Summary

Natsumi lives a happy life with her husband. However, she is worried about his younger brother, Kurou, who lives together with them, because of his delinquency. But one day, when she is involved in a trouble, Kurou saves her and she says, "I'll do anything for you." Like this, she sleeps with Kurou... At first, she doesn't want it, but she gradually gets addicted to his techniques... Days later, Haruka, her younger sister suddenly visits their house and sees them having sex... [From erogeShop]

Reijou no Himitsu
Reijou no Himitsu
NAN%
Tags
  • Shimaidon Ending
  • Romancing a Family
  • Oyakodon Ending
  • Protagonist's Girlfriend as a Heroine
  • Heroine's Mother as a Heroine
Rating 5.4630 Users
Bosei ~Mama Club~
Bosei ~Mama Club~
NAN%
Tags
  • Protagonist's Non-blood-related Mother as a Heroine
  • Non-blood-related Mother/Son Incest
  • Mother Support Character
  • Shota Protagonist
  • Straight Shotacon
Rating 6.6752 Users
Aniyome wa Ijippari
Aniyome wa Ijippari
NAN%
Tags
  • In-law Incest
  • Protagonist's Sister-in-Law as a Heroine
  • University Student Protagonist
  • Lots of Choices
  • Married Heroine
Rating 7.5751 Users
Yakata Jukujo ~The Immoral Residence~
Yakata Jukujo ~The Immoral Residence~
NAN%
Tags
  • Non-blood-related Mother/Son Incest
  • Butler Protagonist
  • Protagonist with Phimosis
  • Obacon
  • Harem Ending with Theme
Rating 7.4745 Users
Toraba!
Toraba!
NAN%
Tags
  • Romancing a Family
  • Swimming Club
  • Class President Heroine
  • Foolish Friend
  • Oyakodon Ending
Rating 6.8824 Users
Musuko no Inbou ni Chietsu Suru Haha ~ Mama o Gifu ni Watasanai!
Musuko no Inbou ni Chietsu Suru Haha ~ Mama o Gifu ni Watasanai!
NAN%
Tags
  • Protagonist's Blood-related Mother as a Heroine
  • Blood-related Mother/Son Incest
  • Netori
  • Only Blood-related Heroines
  • Only Older Heroines
Rating 5.9526 Users
Tokoya no Oba-chan ~Oka no Ue no Barber~
Tokoya no Oba-chan ~Oka no Ue no Barber~
NAN%
Tags
  • Heroine With Kansai Accent
  • Changeable Voice Actors
  • Only Older Heroines
  • Aunt/Nephew Incest
  • Obacon
Rating 6.9861 Users
Toshiue Lesson ~Mama to Oba-san to Sensei to~
Toshiue Lesson ~Mama to Oba-san to Sensei to~
NAN%
Tags
  • Obacon
  • Businesswoman Heroine
  • Blood-related Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Literary Adaptation
Rating 6.3921 Users
Intou Joubo ~Yukemuri ni Ukabu Bibo no Karada
Intou Joubo ~Yukemuri ni Ukabu Bibo no Karada
NAN%
Tags
  • Onsen
  • Widow Heroine
  • Blood-related Mother/Son Incest
  • Forbidden Love
  • Protagonist's Blood-related Mother as a Heroine
Rating 6.4427 Users
Shimaizuma Marriage Disk - Shimaizuma Bubuzuke
Shimaizuma Marriage Disk - Shimaizuma Bubuzuke
NAN%
Tags
  • Asian-style Manor
  • Heroine With Kansai Accent
  • Childishly Violent Heroine
  • Married Heroine
  • Central Heroine
Rating 7.3820 Users
Futago Haha
Futago Haha
NAN%
Tags
  • Blood-related Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Protagonist's Blood-related Mother as a Heroine
  • Twin Sisters as Heroines
  • Mother Support Character
Rating 6.2535 Users
Mariko-sanchi no Seijijou ~Oba-san wa Boku no Mono~
Mariko-sanchi no Seijijou ~Oba-san wa Boku no Mono~
NAN%
Tags
  • Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Divorcee Heroine
  • Protagonist's Cousin as a Heroine
  • Childishly Violent Heroine
Rating 6.8628 Users
Amai Seikatsu -Saikou no Gibo to Saikou no Gishimai-
Amai Seikatsu -Saikou no Gibo to Saikou no Gishimai-
NAN%
Tags
  • Non-blood-related Incest
  • Non-blood-related Mother/Son Incest
  • Protagonist's Non-blood-related Mother as a Heroine
  • Non-blood-related Brother/Sister Incest
  • Protagonist's Non-blood-related Sister as a Heroine
Rating 7.3330 Users
Boin ni Kakero!
Boin ni Kakero!
NAN%
Tags
  • Onsen
  • Heroine With Kansai Accent
  • Lots of Event CGs
  • Shimaidon Ending
  • Romancing a Family
Rating 7.3215 Users
Tsuboi-kun no Switch!
Tsuboi-kun no Switch!
NAN%
Tags
  • Erotic Massage
  • Lotion Play
  • Shota Protagonist
  • Non-blood-related Mother/Son Incest
  • Pegging
Rating 7.1868 Users
Gibo no Milk wa Mitsu no Aji ~Ippai Nonde, Amaete ne~
Gibo no Milk wa Mitsu no Aji ~Ippai Nonde, Amaete ne~
NAN%
Tags
  • Non-blood-related Mother/Son Incest
  • Adult Breast Sucking
  • Only Protagonist's Relatives as Heroine(s)
  • Netori
  • University Student Protagonist
Rating 6.4420 Users
Beppin Mama ~Love Love Boshi Yuugi~
Beppin Mama ~Love Love Boshi Yuugi~
NAN%
Tags
  • Blood-related Aunt/Nephew Incest
  • Only Older Heroines
  • Protagonist's Aunt as a Heroine
  • Straight Shotacon
  • Heroine with Anal Hair
Rating 6.3744 Users
Hitozuma Dorei Keikaku
Hitozuma Dorei Keikaku
NAN%
Tags
  • Urination Fetish
  • Dramatic Love Triangle
  • Revenge
  • Heroine with Garter Belt
  • Protagonist's Sister as a Support Character
Rating 6.9124 Users
Shojo Mama
Shojo Mama
NAN%
Tags
  • Non-blood-related Mother/Son Incest
  • Futanari on Male
  • Clumsy Heroine
  • Domicile
  • Cross-dressing
Rating 6.2420 Users
Hitozuma♪ Kasumi-san 2 ~Oku-sama - Miboujin Owner to Kyoudou Seikatsu~
Hitozuma♪ Kasumi-san 2 ~Oku-sama - Miboujin Owner to Kyoudou Seikatsu~
NAN%
Tags
  • Only Adult Heroines
  • Vaginal Gaping
  • Widow Heroine
  • Stockings
  • Sexual Cosplay
Rating 7.1720 Users
Hadaka no Ou-sama
Hadaka no Ou-sama
NAN%
Tags
  • Design Story
  • Rags to Riches
  • Seiyuu Heroine
  • Office
  • Hotblooded Heroine
Rating 7.3140 Users
Aneboku ~Onee-chan wa Bijin 3 Shimai~
Aneboku ~Onee-chan wa Bijin 3 Shimai~
NAN%
Tags
  • Brother/Sister Romance
  • Protagonist with Phimosis
  • Romancing a Family
  • Protagonist's Non-blood-related Sister as a Heroine
  • Single Hole Multiple Objects Insertion (obsolete)
Rating 7.1623 Users
Noblesse Oblige
Noblesse Oblige
NAN%
Tags
  • Albino Heroine
  • Slice of Life
  • Heroine with Gothic Look
  • Future
  • Heroine with Garter Belt
Rating 6.7230 Users
Kiss + 100 Kiss Tokku, Shidou Seri
Kiss + 100 Kiss Tokku, Shidou Seri
NAN%
Tags
  • Consensual Group Sex of One Female and Several Males
  • Completely Avoidable Netorare
  • Fictional Modern Day Japanese Countryside
  • Netorare Type A
  • Twin Handjob
Rating 6.5027 Users
Koitsuma Biyori ~Yukino-san wa Hitozuma Kanrinin~
Koitsuma Biyori ~Yukino-san wa Hitozuma Kanrinin~
43%
Tags
  • Divorcee Heroine
  • Apartment Building
  • Track Display
  • University Student Protagonist
  • Heroine with Children
Rating 7.0746 Users
Mama Mama!?
Mama Mama!?
40%
Tags
  • Blood-related Mother/Son Incest
  • Grandfather Support Character
  • Protagonist's Blood-related Mother as a Heroine
  • Heroine With Kansai Accent
  • Heroine with Kimono
Rating 7.1325 Users
Boin ni Kakero!
Boin ni Kakero!
36%
Tags
  • Onsen
  • Heroine With Kansai Accent
  • Lots of Event CGs
  • Shimaidon Ending
  • Romancing a Family
Rating 7.3215 Users
Amai Seikatsu -Saikou no Gibo to Saikou no Gishimai-
Amai Seikatsu -Saikou no Gibo to Saikou no Gishimai-
35%
Tags
  • Non-blood-related Incest
  • Non-blood-related Mother/Son Incest
  • Protagonist's Non-blood-related Mother as a Heroine
  • Non-blood-related Brother/Sister Incest
  • Protagonist's Non-blood-related Sister as a Heroine
Rating 7.3330 Users
Mariko-sanchi no Seijijou ~Oba-san wa Boku no Mono~
Mariko-sanchi no Seijijou ~Oba-san wa Boku no Mono~
34%
Tags
  • Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Divorcee Heroine
  • Protagonist's Cousin as a Heroine
  • Childishly Violent Heroine
Rating 6.8628 Users
Shimaizuma Marriage Disk - Shimaizuma Bubuzuke
Shimaizuma Marriage Disk - Shimaizuma Bubuzuke
33%
Tags
  • Asian-style Manor
  • Heroine With Kansai Accent
  • Childishly Violent Heroine
  • Married Heroine
  • Central Heroine
Rating 7.3820 Users
Futago Haha
Futago Haha
33%
Tags
  • Blood-related Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Protagonist's Blood-related Mother as a Heroine
  • Twin Sisters as Heroines
  • Mother Support Character
Rating 6.2535 Users
Toshiue Lesson ~Mama to Oba-san to Sensei to~
Toshiue Lesson ~Mama to Oba-san to Sensei to~
32%
Tags
  • Obacon
  • Businesswoman Heroine
  • Blood-related Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Literary Adaptation
Rating 6.3921 Users
Intou Joubo ~Yukemuri ni Ukabu Bibo no Karada
Intou Joubo ~Yukemuri ni Ukabu Bibo no Karada
32%
Tags
  • Onsen
  • Widow Heroine
  • Blood-related Mother/Son Incest
  • Forbidden Love
  • Protagonist's Blood-related Mother as a Heroine
Rating 6.4427 Users
Gibo no Milk wa Mitsu no Aji ~Ippai Nonde, Amaete ne~
Gibo no Milk wa Mitsu no Aji ~Ippai Nonde, Amaete ne~
32%
Tags
  • Non-blood-related Mother/Son Incest
  • Adult Breast Sucking
  • Only Protagonist's Relatives as Heroine(s)
  • Netori
  • University Student Protagonist
Rating 6.4420 Users
Hitozuma Dorei Keikaku
Hitozuma Dorei Keikaku
31%
Tags
  • Urination Fetish
  • Dramatic Love Triangle
  • Revenge
  • Heroine with Garter Belt
  • Protagonist's Sister as a Support Character
Rating 6.9124 Users
Hitozuma♪ Kasumi-san 2 ~Oku-sama - Miboujin Owner to Kyoudou Seikatsu~
Hitozuma♪ Kasumi-san 2 ~Oku-sama - Miboujin Owner to Kyoudou Seikatsu~
31%
Tags
  • Only Adult Heroines
  • Vaginal Gaping
  • Widow Heroine
  • Stockings
  • Sexual Cosplay
Rating 7.1720 Users
Aneboku ~Onee-chan wa Bijin 3 Shimai~
Aneboku ~Onee-chan wa Bijin 3 Shimai~
29%
Tags
  • Brother/Sister Romance
  • Protagonist with Phimosis
  • Romancing a Family
  • Protagonist's Non-blood-related Sister as a Heroine
  • Single Hole Multiple Objects Insertion (obsolete)
Rating 7.1623 Users
Kiss + 100 Kiss Tokku, Shidou Seri
Kiss + 100 Kiss Tokku, Shidou Seri
28%
Tags
  • Consensual Group Sex of One Female and Several Males
  • Completely Avoidable Netorare
  • Fictional Modern Day Japanese Countryside
  • Netorare Type A
  • Twin Handjob
Rating 6.5027 Users
Furin Kazoku ~Goriyou wa Keikakuteki ni~
Furin Kazoku ~Goriyou wa Keikakuteki ni~
28%
Tags
  • Reverse Netorare
  • Heroine with Beauty Mark
  • Avoidable Netorare (obsolete)
  • Romancing a Family
  • In-law Incest
Rating 7.2224 Users
Gibo to Oba ~Soshite Yuujin no Haha~
Gibo to Oba ~Soshite Yuujin no Haha~
28%
Tags
  • Protagonist's Aunt as a Heroine
  • Protagonist's Non-blood-related Mother as a Heroine
  • Non-blood-related Mother/Son Incest
  • Consensual Group Sex of One Female and Several Males
  • Heroine with Kimono
Rating 6.9830 Users
Jukubo Onsen
Jukubo Onsen
28%
Tags
  • Only Non-Virgin Heroines
  • Hotel
  • Protagonist's Non-blood-related Mother as a Heroine
  • Onsen
  • Clothed Male Naked Female
Rating 7.3816 Users
Okaa-san wa Ore Sen
Okaa-san wa Ore Sen'you! ~Anata no Hajimete o... Okaa-san ga Moratte A-ge-ru~
28%
Tags
  • Protagonist's Blood-related Mother as a Heroine
  • Blood-related Mother/Son Incest
  • Text-only Sexual Content
  • Only Older Heroines
  • Sexual Cosplay
Rating 6.5133 Users
Shin NOZOKI-ma 2 ~Jogakuryou no Himitsu~
Shin NOZOKI-ma 2 ~Jogakuryou no Himitsu~
28%
Tags
  • Paraphilic Infantilism
  • School Nurse Heroine
  • Narrating Others' Thoughts
  • Heroine with Garter Belt
  • Masochist Heroine
Rating 6.3621 Users
Ranbo ~Miboujin Haha no Ureta Nikutai~
Ranbo ~Miboujin Haha no Ureta Nikutai~
27%
Tags
  • Heroine with Inverted Nipples
  • Only Blood-related Heroines
  • Blood-related Mother/Son Incest
  • Protagonist with Children
  • Heroine with Tights
Rating 6.6527 Users
Aneimo ~Ai to H no Step Up~
Aneimo ~Ai to H no Step Up~
27%
Tags
  • Oneesan-type Heroine
  • Heroine with Chinese Dress
  • Gauge Display
  • Harem Ending
  • Imouto-type Heroine
Rating 6.8912 Users
Otouto Shibori ~Ane-tachi no Sei Kyouiku~
Otouto Shibori ~Ane-tachi no Sei Kyouiku~
27%
Tags
  • Shotacon
  • Pegging
  • Footjob
  • Shota Protagonist
  • Oneesan-type Heroine
Rating 6.1321 Users
Natsu Doki! Harem ~Shinsekitaku de no Nayameru Juken Benkyou~
Natsu Doki! Harem ~Shinsekitaku de no Nayameru Juken Benkyou~
27%
Tags
  • Cousin Incest
  • Sister/Sister Incest
  • Aunt/Nephew Incest
  • Blood-related Sister/Sister Incest
  • Protagonist's Cousin as a Heroine
Rating 7.1243 Users
Tokubetsu Jugyou 2
Tokubetsu Jugyou 2
27%
Tags
  • Linked Clamps
  • Crotch Rope Walk
  • Cheerleader Heroine
  • Actress Heroine
  • Leather Bondage
Rating 6.6010 Users

Aniki no Niizuma ~Otto no Koto ga Suki na no ni....~ has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
A novel needs atleast 20 owners before it's similarity is calculated.

Tags (28 total)

NameScoreImportanceWeight
Big Breast Sizes Protagonist3.002.708.10
In-law Incest2.502.556.37
Protagonist's Husband as a Hero2.003.026.04
Protagonist with Big Breasts2.002.444.89
Twincest2.002.314.63
Twin Sisters as Heroines2.501.834.56
Blood-related Sister/Sister Incest2.002.134.26
Impregnation3.001.374.12
Protagonist's Full Sister as a Heroine2.001.863.72
Adult Hero2.001.703.39
Twin Boobjob2.001.683.36
Netorare2.001.513.02
Infidelity2.001.503.00
Protagonist in Relationship2.001.442.88
Harem Ending2.001.412.81
Big Breast Sizes Heroine2.001.322.63
Twin Blowjob2.001.292.57
Adult Protagonist2.501.012.53
Adult Heroine2.001.132.27
Anal Sex2.001.132.26
Female Protagonist3.000.712.13
Nukige3.000.651.95
Group Sex of One Male and Several Females2.000.921.83
Heroine with Big Breasts2.000.841.67
Doggy Style2.000.811.61
Sexual Content2.000.631.26
Reverse Netorare0.332.430.80
ADV3.000.140.43

Traits (33 total)

NameCharactersImportanceWeight
In-law Incest Engages in (Sexual)23.063.36
Sister-in-law Role22.662.92
Double-ended Dildo Subject of (Sexual)22.102.31
Brother-in-law Role12.902.01
Full Sister Role21.561.72
Incest Engages in (Sexual)21.471.61
Netori (their SO is stolen) Subject of12.261.57
Lesbian Sex Engages in (Sexual)21.381.51
Netori (steals the SO) Engages in12.181.51
Netorare (they are the stolen SO) Subject of12.111.47
Younger Brother Role11.901.32
Hair Ribbon Clothes11.801.25
Husband Role11.801.25
Infidelity Engages in11.801.25
Big Breasts Body21.131.24
Older Brother Role11.731.20
University Student Role11.591.10
Older Sister Role11.561.08
Sex while Being Pregnant Engages in (Sexual)11.531.06
Wife Role11.531.06
Younger Sister Role11.451.00
Tank Top Clothes11.410.98
Young-adult Body20.760.83
Handjob Engages in (Sexual)11.160.80
Missionary Subject of (Sexual)11.120.77
Brown Hair20.680.75
Vaginal Fingering Subject of (Sexual)11.080.75
Boobjob Engages in (Sexual)11.070.74
Violet Eyes11.050.73
Waist Length+ Hair10.810.56
Blue Eyes10.800.56
Blowjob Engages in (Sexual)10.760.53
Long Hair10.750.52