Average Rating:7.22
Bayesian Rating:7.12
Total Votes:85
Updated 9 days ago
Ryuuya has an older sister, Miya. He lives a peaceful school life with his friends. But one day, he and his friends accidentally drink a medicine juice. Once you drink it, you'll become sexually sensitive and get sexually excited soon. Especially the breasts of the girls who drink it will get bigger and they will need to have sex to cool down. Also, to make a vaccine, they will need to get pregnant. Like this, Ryuuya starts having sex with the girls to cool them down and make a vaccine...! [From ErogeShop]
Oppai Heart ~Kanojo wa Kedamono Hatsujouki!?~ 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.
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Breast Expansion Subject of | 4 | 2.41 | 3.87 |
| Lace Lingerie Clothes | 5 | 2.10 | 3.75 |
| Inflated Belly Subject of (Sexual) | 5 | 2.04 | 3.66 |
| Sexual Animal Cosplay Engages in (Sexual) | 3 | 2.52 | 3.50 |
| Nipple Sucking Engages in (Sexual) | 6 | 1.70 | 3.30 |
| Nipple Teasing Engages in (Sexual) | 4 | 2.01 | 3.24 |
| Ball-cupping Engages in (Sexual) | 3 | 2.33 | 3.23 |
| Thong Panties Clothes | 3 | 2.30 | 3.19 |
| Sex at School Engages in (Sexual) | 6 | 1.55 | 3.01 |
| Sex in Front of an Audience Engages in (Sexual) | 6 | 1.50 | 2.92 |
| Gokkun Engages in (Sexual) | 3 | 2.04 | 2.83 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.57 | 2.81 |
| Bellyjob Subject of (Sexual) | 1 | 3.83 | 2.65 |
| French Kiss Engages in (Sexual) | 5 | 1.48 | 2.65 |
| Buttjob Engages in (Sexual) | 2 | 2.39 | 2.62 |
| Bodysponge Engages in (Sexual) | 2 | 2.38 | 2.62 |
| Magic Wand Subject of (Sexual) | 2 | 2.37 | 2.61 |
| Student Council Member Role | 2 | 2.37 | 2.60 |
| Microskirt Clothes | 2 | 2.35 | 2.59 |
| High Heeled Boots Clothes | 2 | 2.24 | 2.46 |
| Sexual Cosplay Engages in (Sexual) | 2 | 2.24 | 2.46 |
| Female Ejaculation Engages in (Sexual) | 5 | 1.36 | 2.44 |
| Brooch Clothes | 2 | 2.22 | 2.44 |
| Torn Pantyhose (damaged) Clothes | 2 | 2.20 | 2.42 |
| Bukkake Subject of (Sexual) | 5 | 1.35 | 2.42 |
| Reverse Missionary Subject of (Sexual) | 3 | 1.74 | 2.41 |
| Mules Clothes | 1 | 3.45 | 2.39 |
| Sport Bloomers Clothes | 3 | 1.72 | 2.38 |
| Non-blood-related Incest Engages in (Sexual) | 2 | 2.15 | 2.37 |
| Seventh Posture Subject of (Sexual) | 4 | 1.46 | 2.36 |
| Court Shoes Clothes | 2 | 2.10 | 2.31 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.28 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.17 | 2.28 |
| Boobs on Fence Subject of (Sexual) | 1 | 3.27 | 2.27 |
| Bellyjob Engages in (Sexual) | 1 | 3.27 | 2.27 |
| Sex in Public Places Engages in (Sexual) | 5 | 1.26 | 2.26 |
| Reverse Cowgirl Subject of (Sexual) | 3 | 1.63 | 2.26 |
| Sixty-nine Engages in (Sexual) | 5 | 1.26 | 2.26 |
| Anal Fingering Engages in (Sexual) | 2 | 2.05 | 2.25 |
| Anilingus Subject of (Sexual) | 2 | 2.05 | 2.25 |
| Shoejob Subject of (Sexual) | 1 | 3.21 | 2.23 |
| Nipple Sucking Subject of (Sexual) | 4 | 1.38 | 2.22 |
| Ankle Socks Clothes | 2 | 2.01 | 2.21 |
| Dog Cosplay Engages in | 1 | 3.19 | 2.21 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.95 | 2.14 |
| Piledriver Subject of (Sexual) | 2 | 1.94 | 2.13 |
| Mutual Masturbation Engages in (Sexual) | 2 | 1.94 | 2.13 |
| Paw Gloves Clothes | 1 | 3.03 | 2.10 |
| Cunnilingus Subject of (Sexual) | 5 | 1.16 | 2.08 |
| Serious Personality | 3 | 1.49 | 2.06 |
| Sailor School Uniform Clothes | 3 | 1.47 | 2.04 |
| Intercrural Sex Engages in (Sexual) | 2 | 1.84 | 2.03 |
| Reverse Spitroast Subject of (Sexual) | 2 | 1.84 | 2.02 |
| Big Breasts Body | 5 | 1.13 | 2.02 |
| Shoejob Engages in (Sexual) | 1 | 2.91 | 2.02 |
| Knee-high Boots Clothes | 2 | 1.83 | 2.01 |
| Blazer Clothes | 2 | 1.83 | 2.01 |
| Bodysponge Subject of (Sexual) | 1 | 2.89 | 2.00 |
| Sitting Sex Engages in (Sexual) | 2 | 1.82 | 2.00 |
| Missionary Subject of (Sexual) | 5 | 1.12 | 2.00 |
| Evening Gloves Clothes | 2 | 1.81 | 1.99 |
| Tribadism on Penis Subject of (Sexual) | 1 | 2.86 | 1.98 |
| Petting With Object Subject of (Sexual) | 1 | 2.86 | 1.98 |
| Latex Thigh-high Boots Clothes | 1 | 2.86 | 1.98 |
| Pantyhose Clothes | 3 | 1.43 | 1.98 |
| Prostate Massage Engages in (Sexual) | 1 | 2.84 | 1.97 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.77 | 1.94 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Hetare Personality | 1 | 2.78 | 1.93 |
| Buttjob Subject of (Sexual) | 1 | 2.78 | 1.93 |
| Fishnet Pantyhose Clothes | 1 | 2.78 | 1.92 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.39 | 1.92 |
| Knee-high Socks Clothes | 3 | 1.38 | 1.92 |
| Latex Long Gloves Clothes | 1 | 2.76 | 1.92 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Cheerleader Role | 1 | 2.76 | 1.91 |
| Tube Top Bra Clothes | 1 | 2.75 | 1.90 |
| Butterfly Subject of (Sexual) | 4 | 1.17 | 1.89 |
| Sports Shoes Clothes | 2 | 1.72 | 1.89 |
| Loafers Clothes | 2 | 1.71 | 1.88 |
| Anal Fingering Subject of (Sexual) | 2 | 1.71 | 1.88 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Handjob Engages in (Sexual) | 4 | 1.16 | 1.86 |
| Twin Boobjob Subject of (Sexual) | 1 | 2.68 | 1.86 |
| Pubic Hair Hair | 3 | 1.34 | 1.85 |
| Balls Sucking Subject of (Sexual) | 1 | 2.67 | 1.85 |
| Strapless Leotard Clothes | 1 | 2.67 | 1.85 |
| Student Council Vice President Role | 1 | 2.66 | 1.84 |
| Breast Smothering Engages in (Sexual) | 1 | 2.65 | 1.84 |
| Ahegao Engages in (Sexual) | 3 | 1.32 | 1.83 |
| Collar Clothes | 2 | 1.67 | 1.83 |
| Strapless Mini-dress Clothes | 1 | 2.63 | 1.82 |
| Cheerleading Uniform Clothes | 1 | 2.63 | 1.82 |
| T-shirt Clothes | 3 | 1.31 | 1.82 |
| Bunnygirl Cosplay Engages in | 1 | 2.61 | 1.81 |
| Pantyjob Engages in (Sexual) | 1 | 2.60 | 1.80 |
| Kouhai Role | 2 | 1.63 | 1.79 |
| Senpai Role | 2 | 1.61 | 1.77 |
| Piledriver Engages in (Sexual) | 1 | 2.55 | 1.77 |
| Hair Beads Hair | 1 | 2.53 | 1.75 |
| Whip Items | 1 | 2.52 | 1.74 |
| Halterneck Dress Clothes | 1 | 2.51 | 1.74 |
| Sports Swimsuit Clothes | 1 | 2.48 | 1.72 |
| Boobjob Engages in (Sexual) | 4 | 1.07 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Tube Top Clothes | 1 | 2.48 | 1.72 |
| Cowgirl Subject of (Sexual) | 5 | 0.95 | 1.71 |
| School Nurse Role | 1 | 2.46 | 1.71 |
| Peaked Cap Clothes | 1 | 2.46 | 1.71 |
| Bunny Dress Clothes | 1 | 2.46 | 1.70 |
| Classmate Role | 3 | 1.23 | 1.70 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.70 |
| Homeroom Teacher Role | 1 | 2.45 | 1.70 |
| Slit Dress Clothes | 1 | 2.45 | 1.70 |
| Refined Personality | 2 | 1.54 | 1.70 |
| Straight Hair | 5 | 0.94 | 1.69 |
| Latex Clothes | 1 | 2.44 | 1.69 |
| Step Sister Role | 1 | 2.43 | 1.69 |
| Sex while Being Pregnant Engages in (Sexual) | 2 | 1.53 | 1.69 |
| Thigh-high Stockings Clothes | 4 | 1.04 | 1.68 |
| High School Student Role | 6 | 0.85 | 1.66 |
| Open Cup Bra Clothes | 1 | 2.39 | 1.65 |
| Non-blood-related Brother Role | 1 | 2.38 | 1.65 |
| Swim Shorts Clothes | 1 | 2.37 | 1.64 |
| Anal Gaping Engages in (Sexual) | 1 | 2.36 | 1.64 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Outdoor Sex Engages in (Sexual) | 3 | 1.16 | 1.60 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.31 | 1.60 |
| Sex on Roof Engages in (Sexual) | 1 | 2.29 | 1.59 |
| Pissing on Others Engages in (Sexual) | 1 | 2.27 | 1.57 |
| Balls Sucking Engages in (Sexual) | 1 | 2.25 | 1.56 |
| Athletics Engages in | 1 | 2.25 | 1.56 |
| V Bangs Hair | 2 | 1.41 | 1.55 |
| Gloves Clothes | 2 | 1.41 | 1.55 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.24 | 1.55 |
| Rubber Band With Beads Clothes | 1 | 2.23 | 1.55 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Spoons Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Large Penis Body | 1 | 2.21 | 1.53 |
| Virgin Sex Engages in (Sexual) | 5 | 0.85 | 1.53 |
| Spats Clothes | 1 | 2.20 | 1.53 |
| Milking (Sexual) Subject of (Sexual) | 1 | 2.20 | 1.53 |
| Chinese Dress Clothes | 1 | 2.20 | 1.53 |
| Seventh Posture Engages in (Sexual) | 1 | 2.19 | 1.52 |
| Pissing Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Footjob Subject of (Sexual) | 1 | 2.17 | 1.51 |
| Sexual Dominant Role | 1 | 2.17 | 1.50 |
| Quickie Fix Subject of (Sexual) | 3 | 1.08 | 1.50 |
| Shimapan Clothes | 1 | 2.14 | 1.48 |
| Sitting Sex Subject of (Sexual) | 3 | 1.06 | 1.47 |
| Mary Jane Clothes | 1 | 2.12 | 1.47 |
| Petplay Subject of (Sexual) | 1 | 2.11 | 1.46 |
| Ahoge Hair | 2 | 1.32 | 1.45 |
| Old Type School Swimsuit Clothes | 1 | 2.09 | 1.45 |
| Honor Student Role | 1 | 2.09 | 1.45 |
| Tiny Braid Hair | 1 | 2.07 | 1.44 |
| Student Council President Role | 1 | 2.07 | 1.44 |
| Honorable Personality | 1 | 2.07 | 1.43 |
| Curtained Hair | 2 | 1.30 | 1.43 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Bow Tie Clothes | 1 | 2.04 | 1.42 |
| Kemonomimi Headband Clothes | 1 | 2.04 | 1.42 |
| Cloak Clothes | 1 | 2.04 | 1.42 |
| Turtleneck Sweater Clothes | 1 | 2.04 | 1.41 |
| Optimist Personality | 1 | 2.03 | 1.41 |
| Hime Cut Hair | 1 | 2.02 | 1.40 |
| Anilingus Engages in (Sexual) | 1 | 2.01 | 1.39 |
| Spaulders Clothes | 1 | 2.00 | 1.39 |
| Yamato Nadeshiko Role | 1 | 2.00 | 1.38 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 1.99 | 1.38 |
| Parted in Middle Hair | 2 | 1.25 | 1.37 |
| Decorative Belt Clothes | 1 | 1.98 | 1.37 |
| Facesitting Engages in (Sexual) | 1 | 1.97 | 1.37 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.36 |
| Vibrator Subject of (Sexual) | 1 | 1.97 | 1.36 |
| Tomboy Personality | 1 | 1.96 | 1.36 |
| High Heeled Shoes Clothes | 1 | 1.95 | 1.35 |
| Sandals Clothes | 1 | 1.93 | 1.34 |
| Friendly Personality | 2 | 1.22 | 1.34 |
| Airhead Personality | 1 | 1.92 | 1.33 |
| Cravat Clothes | 1 | 1.91 | 1.33 |
| Friend Role | 2 | 1.20 | 1.32 |
| Masturbation in front of an Audience Engages in (Sexual) | 1 | 1.90 | 1.32 |
| Younger Brother Role | 1 | 1.90 | 1.32 |
| Quickie Fix Engages in (Sexual) | 1 | 1.88 | 1.30 |
| Standing Sex Engages in (Sexual) | 1 | 1.87 | 1.29 |
| Twin Braids Hair | 1 | 1.87 | 1.29 |
| Bra Clothes | 1 | 1.86 | 1.29 |
| Doggy Style Subject of (Sexual) | 3 | 0.92 | 1.28 |
| Pink Rotor Subject of (Sexual) | 1 | 1.84 | 1.27 |
| Honest Personality | 1 | 1.84 | 1.27 |
| Lab Coat Clothes | 1 | 1.79 | 1.24 |
| Flirting Engages in | 1 | 1.79 | 1.24 |
| Necktie Clothes | 2 | 1.12 | 1.23 |
| School Uniform Clothes | 4 | 0.76 | 1.22 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.22 |
| Short Shorts Clothes | 1 | 1.75 | 1.21 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Teen Body | 6 | 0.62 | 1.20 |
| Mischievous Personality | 1 | 1.72 | 1.20 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Naive Personality | 1 | 1.69 | 1.17 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Miniskirt Clothes | 2 | 1.06 | 1.17 |
| Doggy Style Engages in (Sexual) | 1 | 1.68 | 1.17 |
| Intake Hair | 1 | 1.68 | 1.16 |
| Boots Clothes | 1 | 1.68 | 1.16 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Ribbon Hair Accessory Clothes | 1 | 1.66 | 1.15 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Mini-dress Clothes | 1 | 1.64 | 1.13 |
| Pervert Personality | 1 | 1.63 | 1.13 |
| Kind Personality | 2 | 1.03 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.63 | 1.13 |
| Pink Eyes | 1 | 1.62 | 1.12 |
| Slim Body | 6 | 0.58 | 1.12 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.61 | 1.12 |
| Green Eyes | 2 | 1.02 | 1.12 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Apron Clothes | 1 | 1.59 | 1.10 |
| Spiky Bangs Hair | 2 | 1.00 | 1.10 |
| Older Sister Role | 1 | 1.56 | 1.08 |
| Jeans Clothes | 1 | 1.55 | 1.08 |
| Sidehair Hair | 2 | 0.98 | 1.08 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Energetic Personality | 1 | 1.52 | 1.05 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.05 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Long Hair | 3 | 0.75 | 1.04 |
| Choker Clothes | 1 | 1.50 | 1.04 |
| Green Hair | 1 | 1.48 | 1.03 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Blouse Clothes | 1 | 1.46 | 1.01 |
| Headband Clothes | 1 | 1.45 | 1.01 |
| Teasing Engages in | 1 | 1.44 | 1.00 |
| Black Eyes | 1 | 1.42 | 0.98 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| Jacket Clothes | 1 | 1.42 | 0.98 |
| Not a Virgin Role | 1 | 1.41 | 0.98 |
| Tank Top Clothes | 1 | 1.41 | 0.98 |
| Blond Hair | 2 | 0.89 | 0.98 |
| Masturbation Engages in (Sexual) | 1 | 1.40 | 0.97 |
| Pleated Skirt Clothes | 1 | 1.40 | 0.97 |
| Tsurime Eyes | 1 | 1.38 | 0.96 |
| Hosome Eyes | 1 | 1.37 | 0.95 |
| Wavy Hair | 1 | 1.36 | 0.94 |
| Not Sexually Involved Engages in (Sexual) | 1 | 1.35 | 0.94 |
| Pink Hair | 1 | 1.33 | 0.92 |
| Belt Clothes | 1 | 1.27 | 0.88 |
| Dress Clothes | 1 | 1.25 | 0.87 |
| Ribbon Tie Clothes | 1 | 1.25 | 0.87 |
| Watashi Personality | 1 | 1.25 | 0.87 |
| Short Hair | 3 | 0.61 | 0.84 |
| Blue Hair | 1 | 1.19 | 0.83 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Tareme Eyes | 1 | 1.11 | 0.77 |
| Pale Body | 7 | 0.37 | 0.76 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Violet Eyes | 1 | 1.05 | 0.73 |
| Amber Eyes | 1 | 1.03 | 0.72 |
| Waist Length+ Hair | 1 | 0.81 | 0.56 |
| Black Hair | 1 | 0.81 | 0.56 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Young-adult Body | 1 | 0.76 | 0.53 |
| Brown Hair | 1 | 0.68 | 0.47 |
| 5 | 0.00 | 0.00 | |
| 1 | 0.00 | 0.00 |