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Summary

This summer I was asked to watch after my twin nieces. One of the sisters, Mai, is interested in sex. As we are starting to get intimate I need to keep this a secret from her sister Satsuki.

Teakamamire no Danshi
Teakamamire no Danshi
NAN%
Tags
  • Japanese Idols
  • Idol Protagonist
  • Voiced Thoughts
  • Idol Heroine
  • Love Hotel
Rating 6.7225 Users
Renran Spirichu
Renran Spirichu
NAN%
Tags
  • Student Council President Protagonist
  • Breast Expansion
  • Ghost Support Character
  • Heroine with Chinese Dress
  • Promiscuity
Rating 7.2744 Users
Ore to Nakayoshi Shimai no Inma na Himitsu ~Imouto ni Shinu hodo Kiraware Nagara Ane to Sex Suru Kimyou Doukyo Seikatsu~
Ore to Nakayoshi Shimai no Inma na Himitsu ~Imouto ni Shinu hodo Kiraware Nagara Ane to Sex Suru Kimyou Doukyo Seikatsu~
NAN%
Tags
  • Blood-related Sister/Sister Incest
  • Completion Status Indicator
  • Shimaidon Ending
  • Tribadism on Penis
  • Sex in a Vehicle
Rating 6.7048 Users
Toriko no Urara ~Otoko no Sono ni Magirekonda Ichirin no Akai Hana~
Toriko no Urara ~Otoko no Sono ni Magirekonda Ichirin no Akai Hana~
NAN%
Tags
  • All-boys School
  • Gang Rape
  • Blowbang
  • Consensual Group Sex of One Female and Several Males
  • Cross-dressing
Rating 6.8120 Users
Musuko ga Osewa ni Narimashite ~Miboujin Kanrinin-san to Kaa-san to~
Musuko ga Osewa ni Narimashite ~Miboujin Kanrinin-san to Kaa-san to~
NAN%
Tags
  • Mother/Son Incest
  • Only Adult Heroines
  • Masochist Heroine
  • Clothed Male Naked Female
  • Pregnancy Ending
Rating 6.3334 Users
Mazomai ~M na Imouto no Ecchi na Onedari~
Mazomai ~M na Imouto no Ecchi na Onedari~
NAN%
Tags
  • Protagonist's Full Sister as a Heroine
  • Only Protagonist's Sisters as Heroine(s)
  • Harem Ending with Theme
  • Homemaker Protagonist
  • Naizuri
Rating 6.8937 Users
Love Commu
Love Commu
NAN%
Tags
  • May-December Romance
  • Ojousama Heroine
  • Protagonist's Sister as a Support Character
  • All-girls School
  • Teacher Protagonist
Rating 7.3739 Users
Koi wa Mofumofu! Love Me Teddy
Koi wa Mofumofu! Love Me Teddy
NAN%
Tags
  • Shapeshifting
  • Yandere Heroine
  • Heroine with Tights
  • Otaku Heroine
  • Modern Tsundere Heroine
Rating 6.9624 Users
Ero Imo Hurricane! ~Idol no Imouto ga Erokute Erokute Ore no Risei ni Arashi no Yokan!?~
Ero Imo Hurricane! ~Idol no Imouto ga Erokute Erokute Ore no Risei ni Arashi no Yokan!?~
NAN%
Tags
  • Family Life Comedy
  • Live Sexual Broadcast
  • Bisexual Heroine
  • Only Younger Heroines
  • Protagonist's Full Sister as a Heroine
Rating 6.3039 Users
Teakamamire no Fukushuu
Teakamamire no Fukushuu
NAN%
Tags
  • Japanese Idols
  • Idol Heroine
  • Twin Blowjob
  • Heroine with Sexual Experience
  • Lesbian Sex
Rating 6.5423 Users
Nyanto Suteki na Natsuiro Days
Nyanto Suteki na Natsuiro Days
NAN%
Tags
  • Resort
  • Brocon Support Character
  • Catgirl Heroine
  • Unavoidable Harem Ending
  • Protagonist's Sister as a Support Character
Rating 6.7927 Users
Low na Imouto ni Succubus ga Toritsuita node Tanetsuke Yoyuu deshita.
Low na Imouto ni Succubus ga Toritsuita node Tanetsuke Yoyuu deshita.
NAN%
Tags
  • Possession
  • Succubus Heroine
  • Unlockable Sexual Content
  • Protagonist's Younger Sister as a Heroine
  • Fake Choices
Rating 6.5623 Users
Cute Resort ~Shiyou yo♥ Ecchi na Activity~
Cute Resort ~Shiyou yo♥ Ecchi na Activity~
NAN%
Tags
  • Resort
  • Crossover
  • Fully Consensual BDSM Only
  • Twin Sister Support Character
  • Straight Shotacon
Rating 6.5432 Users
Onii-chan, Migite no Shiyou o Kinshi Shimasu! 2
Onii-chan, Migite no Shiyou o Kinshi Shimasu! 2
NAN%
Tags
  • Siscon Protagonist
  • Beach
  • Only Protagonist's Sisters as Heroine(s)
  • Protagonist's Full Sister as a Heroine
  • Summer
Rating 5.9427 Users
Anastasia to 7-nin no Himegami ~Inmon no Rakuin~
Anastasia to 7-nin no Himegami ~Inmon no Rakuin~
NAN%
Tags
  • Tongue Piercing
  • Castration
  • Netorare Type B
  • Norse Mythology
  • Clitoris Growth
Rating 6.6234 Users
Nemureru Sono no Shoujo-tachi
Nemureru Sono no Shoujo-tachi
NAN%
Tags
  • Heroine with Crotchless Clothing
  • Panchira
  • Unlockable Hero(ine)
  • Pregnancy Ending
  • Succubus Heroine
Rating 6.8838 Users
Kanae to Meguri to no Sonogo ga Icha Love Sugite Yabai.
Kanae to Meguri to no Sonogo ga Icha Love Sugite Yabai.
NAN%
Tags
  • Group Sex
  • Threesome Ending
  • Heroine with Heterochromia
  • Hetare Protagonist
  • Balls Sucking
Rating 7.2171 Users
Himekoi * Sucreine!
Himekoi * Sucreine!
NAN%
Tags
  • Hime Heroine
  • Princess Heroine
  • Maid Support Character
  • Emotionless Heroine
  • Protagonist's Sister as a Support Character
Rating 6.8020 Users
Iegami Nyoubou ~Nanashi Nekomata wa KamiTuber~
Iegami Nyoubou ~Nanashi Nekomata wa KamiTuber~
NAN%
Tags
  • Lazy Heroine
  • Catgirl Heroine
  • Tailjob
  • Armpit Sex
  • Heroine with Kimono
Rating 6.8825 Users
Mousugu Natsuyasumi! 2
Mousugu Natsuyasumi! 2
NAN%
Tags
  • Promiscuity
  • Straight Shotacon
  • Child Protagonist
  • Transfer Student Heroine
  • Single Hole Double Penetration (obsolete)
Rating 6.1437 Users
Maid to no Amai Seikatsu
Maid to no Amai Seikatsu
NAN%
Tags
  • Blood-related Aunt/Nephew Incest
  • Protagonist's Aunt as a Heroine
  • Only Older Heroines
  • Shota Protagonist
  • Straight Shotacon
Rating 5.9722 Users
Little Sick Girls ~Kagami no Naka no Idol~
Little Sick Girls ~Kagami no Naka no Idol~
NAN%
Tags
  • Chuunibyou Protagonist
  • Nympho Heroine
  • Kinetic Novel
  • Only a Single Heroine
  • Sexual Content
Rating 6.8734 Users
Animal☆Panic
Animal☆Panic
NAN%
Tags
  • Kemonomimi
  • Class President Heroine
  • Rabbits
  • Mahou Shoujo Heroine
  • Fairies
Rating 7.3252 Users
Chinkamo Twins 2! ~Natsu da! Umi da! Futago no Imouto Oppai Taiketsu da!~
Chinkamo Twins 2! ~Natsu da! Umi da! Futago no Imouto Oppai Taiketsu da!~
NAN%
Tags
  • Only Blood-related Heroines
  • Only Protagonist's Sisters as Heroine(s)
  • Unnamed Protagonist
  • Twin Footjob
  • Oppai Loli Heroine
Rating 6.3720 Users
Natsu Ecchi ~Mei to Inaka no Natsuyasumi~
Natsu Ecchi ~Mei to Inaka no Natsuyasumi~
38%
Tags
  • Blood-related Uncle/Niece Incest
  • Countryside
  • Protagonist's Niece as a Heroine
  • Summer
  • Straight Lolicon
Rating 5.8930 Users
Ero Imo Cyclone! ~Uzumaku Eroero wa Imouto o Chuushin ni Kyuusoku Kakudaichuu!~
Ero Imo Cyclone! ~Uzumaku Eroero wa Imouto o Chuushin ni Kyuusoku Kakudaichuu!~
38%
Tags
  • Family Life Comedy
  • Unavoidable Harem Ending
  • Polyamory
  • Triple Footjob
  • Boke Heroine
Rating 6.7625 Users
Onii-chan, Migite no Shiyou o Kinshi Shimasu! 2
Onii-chan, Migite no Shiyou o Kinshi Shimasu! 2
36%
Tags
  • Siscon Protagonist
  • Beach
  • Only Protagonist's Sisters as Heroine(s)
  • Protagonist's Full Sister as a Heroine
  • Summer
Rating 5.9427 Users
Cute Resort ~Shiyou yo♥ Ecchi na Activity~
Cute Resort ~Shiyou yo♥ Ecchi na Activity~
35%
Tags
  • Resort
  • Crossover
  • Fully Consensual BDSM Only
  • Twin Sister Support Character
  • Straight Shotacon
Rating 6.5432 Users
Low na Imouto ni Succubus ga Toritsuita node Tanetsuke Yoyuu deshita.
Low na Imouto ni Succubus ga Toritsuita node Tanetsuke Yoyuu deshita.
33%
Tags
  • Possession
  • Succubus Heroine
  • Unlockable Sexual Content
  • Protagonist's Younger Sister as a Heroine
  • Fake Choices
Rating 6.5623 Users
Teakamamire no Fukushuu
Teakamamire no Fukushuu
33%
Tags
  • Japanese Idols
  • Idol Heroine
  • Twin Blowjob
  • Heroine with Sexual Experience
  • Lesbian Sex
Rating 6.5423 Users
Nyanto Suteki na Natsuiro Days
Nyanto Suteki na Natsuiro Days
32%
Tags
  • Resort
  • Brocon Support Character
  • Catgirl Heroine
  • Unavoidable Harem Ending
  • Protagonist's Sister as a Support Character
Rating 6.7927 Users
Koi wa Mofumofu! Love Me Teddy
Koi wa Mofumofu! Love Me Teddy
30%
Tags
  • Shapeshifting
  • Yandere Heroine
  • Heroine with Tights
  • Otaku Heroine
  • Modern Tsundere Heroine
Rating 6.9624 Users
Ero Imo Hurricane! ~Idol no Imouto ga Erokute Erokute Ore no Risei ni Arashi no Yokan!?~
Ero Imo Hurricane! ~Idol no Imouto ga Erokute Erokute Ore no Risei ni Arashi no Yokan!?~
29%
Tags
  • Family Life Comedy
  • Live Sexual Broadcast
  • Bisexual Heroine
  • Only Younger Heroines
  • Protagonist's Full Sister as a Heroine
Rating 6.3039 Users
Nemureru Sono no Shoujo-tachi
Nemureru Sono no Shoujo-tachi
28%
Tags
  • Heroine with Crotchless Clothing
  • Panchira
  • Unlockable Hero(ine)
  • Pregnancy Ending
  • Succubus Heroine
Rating 6.8838 Users
Himekoi * Sucreine!
Himekoi * Sucreine!
28%
Tags
  • Hime Heroine
  • Princess Heroine
  • Maid Support Character
  • Emotionless Heroine
  • Protagonist's Sister as a Support Character
Rating 6.8020 Users
Mousugu Natsuyasumi! 2
Mousugu Natsuyasumi! 2
28%
Tags
  • Promiscuity
  • Straight Shotacon
  • Child Protagonist
  • Transfer Student Heroine
  • Single Hole Double Penetration (obsolete)
Rating 6.1437 Users
Little Sick Girls ~Kagami no Naka no Idol~
Little Sick Girls ~Kagami no Naka no Idol~
28%
Tags
  • Chuunibyou Protagonist
  • Nympho Heroine
  • Kinetic Novel
  • Only a Single Heroine
  • Sexual Content
Rating 6.8734 Users
Chinkamo Twins 2! ~Natsu da! Umi da! Futago no Imouto Oppai Taiketsu da!~
Chinkamo Twins 2! ~Natsu da! Umi da! Futago no Imouto Oppai Taiketsu da!~
28%
Tags
  • Only Blood-related Heroines
  • Only Protagonist's Sisters as Heroine(s)
  • Unnamed Protagonist
  • Twin Footjob
  • Oppai Loli Heroine
Rating 6.3720 Users
Pure Marriage ~Akai Ito Monogatari - Harem Hen~
Pure Marriage ~Akai Ito Monogatari - Harem Hen~
28%
Tags
  • Polygamy
  • Wedding
  • Protagonist's Sister as a Heroine
  • Harem Ending
  • Modern Tsundere Heroine
Rating 6.6727 Users
shin-neko ~Saikai Shita Imouto to no Arata na Kankei~
shin-neko ~Saikai Shita Imouto to no Arata na Kankei~
28%
Tags
  • Straight Lolicon
  • Only Blood-related Heroines
  • Only Protagonist's Sisters as Heroine(s)
  • Only Younger Heroines
  • Only Loli Heroines
Rating 6.4730 Users
Isekai Fuuzoku, Hajimemashita!? ~Tensei Shitara Harem Seikatsu ga Mattemashita~
Isekai Fuuzoku, Hajimemashita!? ~Tensei Shitara Harem Seikatsu ga Mattemashita~
27%
Tags
  • Undead Heroine
  • Dragon Heroine
  • Kneepit Sex
  • Heroine with Wings
  • Angel Heroine
Rating 6.7045 Users
AI Love: Koisuru Otome wa Kikaijikake
AI Love: Koisuru Otome wa Kikaijikake
27%
Tags
  • Technician Protagonist
  • Robot Heroine
  • Scientist Protagonist
  • AI Heroine
  • Under the Same Roof
Rating 7.0531 Users
Onii-chan Teacher ~Himitsu no Jugyou o Kibou Shimasu!~
Onii-chan Teacher ~Himitsu no Jugyou o Kibou Shimasu!~
27%
Tags
  • Braless Heroine
  • Heroine with Flat Chest (Non-Loli)
  • Sexually Oblivious Heroine
  • Only Blood-related Heroines
  • Only Protagonist's Sisters as Heroine(s)
Rating 6.8851 Users
Asa Okitara Bishoujo ni Natteta Boku ni Onegai ga Arundatte? Shouganai nyaa.. Ii yo.
Asa Okitara Bishoujo ni Natteta Boku ni Onegai ga Arundatte? Shouganai nyaa.. Ii yo.
26%
Tags
  • Gender Bending
  • Genderbent Sex
  • Sex Change
  • Loli Protagonist
  • Sprite Viewer
Rating 6.5641 Users
Summer☆Camp
Summer☆Camp
26%
Tags
  • Shotacon Heroine
  • Summer Camp
  • Popular Protagonist
  • Promiscuity
  • Heroine with Swimsuits
Rating 6.0931 Users
Adebana Sacrament -Seinaru Miwaza to Akuryoutsuki no Shoujo-tachi-
Adebana Sacrament -Seinaru Miwaza to Akuryoutsuki no Shoujo-tachi-
25%
Tags
  • Possession
  • Student-Teacher Romance
  • Bleep Censor
  • Demon Heroine
  • Student Council President Heroine
Rating 6.5722 Users
Shinsei Kourin Dacryon ~Tadashii Tenshi no Sodatekata~
Shinsei Kourin Dacryon ~Tadashii Tenshi no Sodatekata~
25%
Tags
  • Bred by Monsters
  • Prolapse
  • Cum Bath
  • Mahou Shoujo Heroine
  • Autofellatio
Rating 6.6521 Users
Mai Yome ~My Yome~
Mai Yome ~My Yome~
25%
Tags
  • Sex Involving Children
  • Only Younger Heroines
  • Only Protagonist's Sisters as Heroine(s)
  • Only Loli Heroines
  • Deredere Heroine
Rating 5.6020 Users

Natsu Ecchi 2 ~Futago to Inaka no Natsuyasumi~ 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 (34 total)

NameScoreImportanceWeight
Blood-related Uncle/Niece Incest2.002.845.68
Unnamed Protagonist3.001.885.63
Protagonist's Niece as a Heroine2.002.795.57
Oppai Loli Heroine2.502.205.50
Sister/Sister Incest2.002.384.76
Straight Lolicon3.001.504.50
Shimaidon Ending2.002.134.26
Only Loli Heroines2.331.784.14
Countryside2.002.054.10
Twin Sisters as Heroines2.001.823.65
Genius Heroine2.001.773.53
Threesome Ending2.001.743.48
Facesitting2.001.653.29
Harem Ending2.001.402.81
Twin Blowjob2.001.292.57
Bathroom Sex2.001.192.37
Pregnant Sex2.001.182.35
Lesbian Sex2.001.152.30
Quickie Fix Position2.001.112.23
Only Virgin Heroines2.001.082.16
Sixty-nine2.001.072.14
Standing Sex2.001.052.11
Naked Sprites2.001.052.10
Adult Protagonist2.001.022.04
Outdoor Sex2.000.991.99
Missionary Position2.000.941.88
Cunnilingus2.000.931.86
Group Sex of One Male and Several Females2.000.921.83
Cowgirl2.000.841.67
Defloration2.000.761.52
Multiple Endings2.000.671.34
Nukige2.000.651.30
Male Protagonist2.000.300.60
ADV2.000.140.29

Traits (40 total)

NameCharactersImportanceWeight
Twin Sister Role21.862.04
Reverse Spitroast Subject of (Sexual)21.842.02
Twin Blowjob Engages in (Sexual)21.451.59
Reverse Cowgirl Engages in (Sexual)12.221.54
Spats Clothes12.201.52
Kid Body21.371.51
Tiny Braid Hair12.071.44
Lonely Role12.051.42
Genius Personality11.991.38
Standing Sex Subject of (Sexual)21.181.29
Group Sex of One Male and Several Females Engages in (Sexual)21.171.29
Butterfly Subject of (Sexual)21.171.29
String Ribbon Tie Clothes11.821.26
Hair Ribbon Clothes11.801.25
Side Tail Hair11.751.21
Reverse Missionary Subject of (Sexual)11.741.20
Quickie Fix Subject of (Sexual)21.081.19
Cyan Eyes11.661.15
Garnet Eyes11.661.15
Nipple Teasing Subject of (Sexual)11.571.09
Older Sister Role11.561.08
Doggy Style Subject of (Sexual)20.921.02
Shoulder-length Hair20.921.01
Younger Sister Role11.441.00
Tank Top Clothes11.410.98
Hairpin Clothes11.400.97
Pleated Skirt Clothes11.390.97
Knee-high Socks Clothes11.380.96
Virgin Sex Engages in (Sexual)20.850.93
Sixty-nine Engages in (Sexual)11.260.87
Blowjob Engages in (Sexual)20.760.84
Blue Hair11.190.83
Cunnilingus Subject of (Sexual)11.160.81
Shirt Clothes11.160.80
Boobjob Engages in (Sexual)11.070.74
Sitting Sex Subject of (Sexual)11.060.74
Cowgirl Subject of (Sexual)10.950.66
Slim Body20.580.63
Blond Hair10.890.62
Pale Body20.370.40