Average Rating:7.19
Bayesian Rating:7.08
Total Votes:88
Updated 27 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 | 3.88 |
| Lace Lingerie Clothes | 5 | 2.10 | 3.76 |
| 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 | 1.69 | 3.29 |
| Nipple Teasing Engages in (Sexual) | 4 | 1.99 | 3.21 |
| Ball-cupping Engages in (Sexual) | 3 | 2.31 | 3.21 |
| Thong Panties Clothes | 3 | 2.27 | 3.15 |
| Sex at School Engages in (Sexual) | 6 | 1.54 | 3.00 |
| Sex in Front of an Audience Engages in (Sexual) | 6 | 1.50 | 2.91 |
| Gokkun Engages in (Sexual) | 3 | 2.05 | 2.85 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.55 | 2.78 |
| Bellyjob Subject of (Sexual) | 1 | 3.81 | 2.64 |
| Buttjob Engages in (Sexual) | 2 | 2.38 | 2.61 |
| Magic Wand Subject of (Sexual) | 2 | 2.38 | 2.61 |
| Student Council Member Role | 2 | 2.37 | 2.61 |
| Bodysponge Engages in (Sexual) | 2 | 2.37 | 2.61 |
| French Kiss Engages in (Sexual) | 5 | 1.45 | 2.60 |
| Microskirt Clothes | 2 | 2.35 | 2.58 |
| Sexual Cosplay Engages in (Sexual) | 2 | 2.24 | 2.46 |
| High Heeled Boots Clothes | 2 | 2.23 | 2.45 |
| Brooch Clothes | 2 | 2.23 | 2.45 |
| Torn Pantyhose (damaged) Clothes | 2 | 2.21 | 2.43 |
| Bukkake Subject of (Sexual) | 5 | 1.35 | 2.42 |
| Female Ejaculation Engages in (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 | 2.36 |
| Seventh Posture Subject of (Sexual) | 4 | 1.47 | 2.36 |
| Court Shoes Clothes | 2 | 2.10 | 2.30 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.28 |
| Boobs on Fence Subject of (Sexual) | 1 | 3.28 | 2.27 |
| Bellyjob Engages in (Sexual) | 1 | 3.28 | 2.27 |
| Sixty-nine Engages in (Sexual) | 5 | 1.26 | 2.26 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.16 | 2.26 |
| Reverse Cowgirl Subject of (Sexual) | 3 | 1.63 | 2.26 |
| Sex in Public Places 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 |
| Ankle Socks Clothes | 2 | 2.02 | 2.22 |
| Dog Cosplay Engages in | 1 | 3.20 | 2.21 |
| Nipple Sucking Subject of (Sexual) | 4 | 1.38 | 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 | 3.04 | 2.11 |
| Cunnilingus Subject of (Sexual) | 5 | 1.16 | 2.08 |
| Serious Personality | 3 | 1.48 | 2.06 |
| Sailor School Uniform Clothes | 3 | 1.47 | 2.04 |
| Reverse Spitroast Subject of (Sexual) | 2 | 1.84 | 2.02 |
| Shoejob Engages in (Sexual) | 1 | 2.91 | 2.02 |
| Blazer Clothes | 2 | 1.83 | 2.01 |
| Intercrural Sex Engages in (Sexual) | 2 | 1.83 | 2.01 |
| Bodysponge Subject of (Sexual) | 1 | 2.90 | 2.01 |
| Missionary Subject of (Sexual) | 5 | 1.12 | 2.01 |
| Knee-high Boots Clothes | 2 | 1.82 | 2.00 |
| Sitting Sex Engages in (Sexual) | 2 | 1.82 | 2.00 |
| Evening Gloves Clothes | 2 | 1.82 | 2.00 |
| Pantyhose Clothes | 3 | 1.43 | 1.98 |
| Petting With Object Subject of (Sexual) | 1 | 2.86 | 1.98 |
| Tribadism on Penis Subject of (Sexual) | 1 | 2.85 | 1.98 |
| Latex Thigh-high Boots Clothes | 1 | 2.85 | 1.98 |
| Big Breasts Body | 5 | 1.10 | 1.98 |
| Prostate Massage Engages in (Sexual) | 1 | 2.82 | 1.96 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.77 | 1.95 |
| Hetare Personality | 1 | 2.79 | 1.93 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Knee-high Socks Clothes | 3 | 1.39 | 1.93 |
| Buttjob Subject of (Sexual) | 1 | 2.76 | 1.92 |
| Fishnet Pantyhose Clothes | 1 | 2.76 | 1.92 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.38 | 1.92 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Latex Long Gloves Clothes | 1 | 2.75 | 1.91 |
| Cheerleader Role | 1 | 2.74 | 1.90 |
| Butterfly Subject of (Sexual) | 4 | 1.17 | 1.89 |
| Tube Top Bra Clothes | 1 | 2.72 | 1.88 |
| Anal Fingering Subject of (Sexual) | 2 | 1.71 | 1.88 |
| Tominagi Subject of (Sexual) | 3 | 1.35 | 1.88 |
| Sports Shoes Clothes | 2 | 1.71 | 1.88 |
| Loafers Clothes | 2 | 1.71 | 1.87 |
| Twin Boobjob Subject of (Sexual) | 1 | 2.68 | 1.86 |
| Handjob Engages in (Sexual) | 4 | 1.15 | 1.86 |
| Pubic Hair Hair | 3 | 1.34 | 1.85 |
| Balls Sucking Subject of (Sexual) | 1 | 2.67 | 1.85 |
| Student Council Vice President Role | 1 | 2.67 | 1.85 |
| Strapless Leotard Clothes | 1 | 2.66 | 1.84 |
| Collar Clothes | 2 | 1.68 | 1.84 |
| Breast Smothering Engages in (Sexual) | 1 | 2.63 | 1.82 |
| Ahegao Engages in (Sexual) | 3 | 1.32 | 1.82 |
| T-shirt Clothes | 3 | 1.31 | 1.81 |
| Strapless Mini-dress Clothes | 1 | 2.61 | 1.81 |
| Cheerleading Uniform Clothes | 1 | 2.60 | 1.80 |
| Bunnygirl Cosplay Engages in | 1 | 2.60 | 1.80 |
| Pantyjob Engages in (Sexual) | 1 | 2.60 | 1.80 |
| Kouhai Role | 2 | 1.63 | 1.80 |
| Senpai Role | 2 | 1.62 | 1.78 |
| Piledriver Engages in (Sexual) | 1 | 2.55 | 1.77 |
| Hair Beads Hair | 1 | 2.53 | 1.76 |
| Whip Items | 1 | 2.52 | 1.75 |
| Halterneck Dress Clothes | 1 | 2.52 | 1.74 |
| Boobjob Engages in (Sexual) | 4 | 1.07 | 1.73 |
| Sports Swimsuit Clothes | 1 | 2.49 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Cowgirl Subject of (Sexual) | 5 | 0.96 | 1.71 |
| School Nurse Role | 1 | 2.47 | 1.71 |
| Classmate Role | 3 | 1.23 | 1.71 |
| Peaked Cap Clothes | 1 | 2.47 | 1.71 |
| Tube Top Clothes | 1 | 2.46 | 1.71 |
| Bunny Dress Clothes | 1 | 2.46 | 1.70 |
| Homeroom Teacher Role | 1 | 2.45 | 1.70 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.70 |
| Slit Dress Clothes | 1 | 2.45 | 1.70 |
| Refined Personality | 2 | 1.54 | 1.70 |
| Latex Clothes | 1 | 2.44 | 1.69 |
| Step Sister Role | 1 | 2.44 | 1.69 |
| Sex while Being Pregnant Engages in (Sexual) | 2 | 1.54 | 1.69 |
| Thigh-high Stockings Clothes | 4 | 1.05 | 1.69 |
| High School Student Role | 6 | 0.86 | 1.68 |
| Straight Hair | 5 | 0.93 | 1.68 |
| Open Cup Bra Clothes | 1 | 2.38 | 1.65 |
| Non-blood-related Brother Role | 1 | 2.38 | 1.65 |
| Swim Shorts Clothes | 1 | 2.36 | 1.63 |
| Anal Gaping Engages in (Sexual) | 1 | 2.36 | 1.63 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Outdoor Sex Engages in (Sexual) | 3 | 1.16 | 1.61 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.31 | 1.60 |
| Sex on Roof Engages in (Sexual) | 1 | 2.29 | 1.58 |
| Pissing on Others Engages in (Sexual) | 1 | 2.27 | 1.57 |
| Athletics Engages in | 1 | 2.25 | 1.56 |
| Balls Sucking Engages in (Sexual) | 1 | 2.25 | 1.56 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.24 | 1.55 |
| Gloves Clothes | 2 | 1.41 | 1.55 |
| Rubber Band With Beads Clothes | 1 | 2.24 | 1.55 |
| V Bangs Hair | 2 | 1.41 | 1.55 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Virgin Sex Engages in (Sexual) | 5 | 0.85 | 1.53 |
| Spoons Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Large Penis Body | 1 | 2.21 | 1.53 |
| Spats Clothes | 1 | 2.20 | 1.53 |
| Chinese Dress Clothes | 1 | 2.20 | 1.53 |
| Milking (Sexual) Subject of (Sexual) | 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 |
| Quickie Fix Subject of (Sexual) | 3 | 1.08 | 1.50 |
| Sexual Dominant Role | 1 | 2.17 | 1.50 |
| Shimapan Clothes | 1 | 2.14 | 1.48 |
| Sitting Sex Subject of (Sexual) | 3 | 1.06 | 1.48 |
| Mary Jane Clothes | 1 | 2.12 | 1.47 |
| Petplay Subject of (Sexual) | 1 | 2.11 | 1.46 |
| Ahoge Hair | 2 | 1.33 | 1.46 |
| Old Type School Swimsuit Clothes | 1 | 2.10 | 1.45 |
| Honor Student Role | 1 | 2.09 | 1.45 |
| Student Council President Role | 1 | 2.08 | 1.44 |
| Tiny Braid Hair | 1 | 2.08 | 1.44 |
| Honorable Personality | 1 | 2.07 | 1.43 |
| Curtained Hair | 2 | 1.30 | 1.43 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Kemonomimi Headband Clothes | 1 | 2.05 | 1.42 |
| Bow Tie Clothes | 1 | 2.05 | 1.42 |
| Cloak Clothes | 1 | 2.04 | 1.42 |
| Optimist Personality | 1 | 2.04 | 1.41 |
| Turtleneck Sweater Clothes | 1 | 2.03 | 1.41 |
| Hime Cut Hair | 1 | 2.03 | 1.41 |
| Spaulders Clothes | 1 | 2.00 | 1.39 |
| Anilingus Engages in (Sexual) | 1 | 2.00 | 1.39 |
| Yamato Nadeshiko Role | 1 | 1.99 | 1.38 |
| Decorative Belt Clothes | 1 | 1.98 | 1.37 |
| Parted in Middle Hair | 2 | 1.24 | 1.37 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.37 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 1.97 | 1.37 |
| Facesitting Engages in (Sexual) | 1 | 1.96 | 1.36 |
| Tomboy Personality | 1 | 1.95 | 1.35 |
| Vibrator Subject of (Sexual) | 1 | 1.95 | 1.35 |
| High Heeled Shoes Clothes | 1 | 1.93 | 1.34 |
| Friendly Personality | 2 | 1.21 | 1.33 |
| Airhead Personality | 1 | 1.92 | 1.33 |
| Cravat Clothes | 1 | 1.92 | 1.33 |
| Sandals Clothes | 1 | 1.91 | 1.33 |
| Masturbation in front of an Audience Engages in (Sexual) | 1 | 1.90 | 1.32 |
| Younger Brother Role | 1 | 1.90 | 1.32 |
| Friend Role | 2 | 1.20 | 1.31 |
| Quickie Fix Engages in (Sexual) | 1 | 1.88 | 1.30 |
| Twin Braids Hair | 1 | 1.87 | 1.30 |
| Standing Sex Engages in (Sexual) | 1 | 1.86 | 1.29 |
| Doggy Style Subject of (Sexual) | 3 | 0.93 | 1.28 |
| Pink Rotor Subject of (Sexual) | 1 | 1.84 | 1.27 |
| Honest Personality | 1 | 1.83 | 1.27 |
| Bra Clothes | 1 | 1.83 | 1.27 |
| Lab Coat Clothes | 1 | 1.80 | 1.24 |
| Flirting Engages in | 1 | 1.78 | 1.23 |
| School Uniform Clothes | 4 | 0.77 | 1.23 |
| Necktie Clothes | 2 | 1.12 | 1.23 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Teen Body | 6 | 0.62 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Short Shorts Clothes | 1 | 1.74 | 1.20 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Mischievous Personality | 1 | 1.72 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Naive Personality | 1 | 1.69 | 1.17 |
| Intake Hair | 1 | 1.69 | 1.17 |
| Miniskirt Clothes | 2 | 1.06 | 1.17 |
| Doggy Style Engages in (Sexual) | 1 | 1.68 | 1.17 |
| Boots Clothes | 1 | 1.68 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.15 |
| Ribbon Hair Accessory Clothes | 1 | 1.66 | 1.15 |
| Mini-dress Clothes | 1 | 1.64 | 1.14 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.64 | 1.13 |
| Relaxed Personality | 1 | 1.64 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.63 | 1.13 |
| Pink Eyes | 1 | 1.63 | 1.13 |
| Kind Personality | 2 | 1.02 | 1.12 |
| Pervert Personality | 1 | 1.62 | 1.12 |
| Green Eyes | 2 | 1.02 | 1.12 |
| Slim Body | 6 | 0.57 | 1.12 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.61 | 1.12 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Apron Clothes | 1 | 1.59 | 1.10 |
| Spiky Bangs Hair | 2 | 0.99 | 1.09 |
| Older Sister Role | 1 | 1.56 | 1.08 |
| Sidehair Hair | 2 | 0.98 | 1.08 |
| Jeans Clothes | 1 | 1.54 | 1.07 |
| Hard Worker Personality | 1 | 1.54 | 1.06 |
| 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 | 1.49 | 1.03 |
| Pissing Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Blouse Clothes | 1 | 1.46 | 1.01 |
| Headband Clothes | 1 | 1.46 | 1.01 |
| Teasing Engages in | 1 | 1.43 | 0.99 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| Black Eyes | 1 | 1.42 | 0.98 |
| Jacket Clothes | 1 | 1.41 | 0.98 |
| Blond Hair | 2 | 0.89 | 0.98 |
| Masturbation Engages in (Sexual) | 1 | 1.41 | 0.97 |
| Not a Virgin Role | 1 | 1.40 | 0.97 |
| Tank Top Clothes | 1 | 1.40 | 0.97 |
| Pleated Skirt Clothes | 1 | 1.39 | 0.96 |
| Tsurime Eyes | 1 | 1.38 | 0.96 |
| Hosome Eyes | 1 | 1.37 | 0.95 |
| Not Sexually Involved Engages in | 1 | 1.35 | 0.94 |
| Wavy Hair | 1 | 1.35 | 0.94 |
| Pink Hair | 1 | 1.34 | 0.93 |
| Belt Clothes | 1 | 1.26 | 0.88 |
| Dress Clothes | 1 | 1.26 | 0.87 |
| Ribbon Tie Clothes | 1 | 1.26 | 0.87 |
| Watashi Personality | 1 | 1.24 | 0.86 |
| Short Hair | 3 | 0.61 | 0.84 |
| Blue Hair | 1 | 1.20 | 0.83 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.14 | 0.79 |
| 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 | 0.82 | 0.57 |
| Blue Eyes | 1 | 0.81 | 0.56 |
| Black Hair | 1 | 0.80 | 0.56 |
| Young-adult Body | 1 | 0.75 | 0.52 |
| Brown Hair | 1 | 0.69 | 0.48 |
| 1 | 0.00 | 0.00 | |
| 5 | 0.00 | 0.00 |