Average Rating:7.20
Bayesian Rating:7.11
Total Votes:84
Updated 26 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 |
|---|---|---|---|
| Sex in School Infirmary Engages in (Sexual) | 5 | 2.23 | 3.99 |
| Breast Expansion Subject of | 4 | 2.40 | 3.87 |
| Lace Lingerie Clothes | 5 | 2.09 | 3.75 |
| Inflated Belly Subject of (Sexual) | 5 | 2.04 | 3.65 |
| Sexual Animal Cosplay Engages in (Sexual) | 3 | 2.53 | 3.50 |
| Ball-cupping Engages in (Sexual) | 3 | 2.34 | 3.24 |
| Thong Panties Clothes | 3 | 2.32 | 3.22 |
| Sex in Classroom Engages in (Sexual) | 6 | 1.61 | 3.12 |
| Adult Breast Feeding (obsolete) Subject of (Sexual) | 2 | 2.81 | 3.09 |
| Nipple Sucking Engages in (Sexual) | 5 | 1.70 | 3.05 |
| Sex in Front of an Audience Engages in (Sexual) | 6 | 1.50 | 2.92 |
| Gokkun Engages in (Sexual) | 3 | 2.04 | 2.82 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.57 | 2.82 |
| Nipple Teasing Engages in (Sexual) | 3 | 2.02 | 2.80 |
| French Kiss Engages in (Sexual) | 5 | 1.49 | 2.66 |
| Bellyjob Subject of (Sexual) | 1 | 3.82 | 2.65 |
| Buttjob Engages in (Sexual) | 2 | 2.40 | 2.64 |
| Bodysponge Engages in (Sexual) | 2 | 2.38 | 2.61 |
| Magic Wand Subject of (Sexual) | 2 | 2.37 | 2.60 |
| Student Council Member Role | 2 | 2.37 | 2.60 |
| Microskirt Clothes | 2 | 2.35 | 2.58 |
| High Heeled Boots Clothes | 2 | 2.25 | 2.47 |
| Sexual Cosplay Engages in (Sexual) | 2 | 2.24 | 2.46 |
| Female Ejaculation Engages in (Sexual) | 5 | 1.37 | 2.45 |
| Brooch Clothes | 2 | 2.22 | 2.44 |
| Torn Pantyhose (damaged) Clothes | 2 | 2.21 | 2.43 |
| Bukkake Subject of (Sexual) | 5 | 1.35 | 2.41 |
| Reverse Missionary Subject of (Sexual) | 3 | 1.73 | 2.40 |
| Mules Clothes | 1 | 3.45 | 2.39 |
| Sport Bloomers Clothes | 3 | 1.72 | 2.38 |
| Non-blood-related Incest Engages in (Sexual) | 2 | 2.16 | 2.37 |
| Seventh Posture Subject of (Sexual) | 4 | 1.46 | 2.35 |
| Court Shoes Clothes | 2 | 2.11 | 2.32 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.17 | 2.29 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Bellyjob Engages in (Sexual) | 1 | 3.27 | 2.27 |
| Reverse Cowgirl Subject of (Sexual) | 3 | 1.63 | 2.26 |
| Boobs on Fence Subject of (Sexual) | 1 | 3.26 | 2.26 |
| Sex in Public Places Engages in (Sexual) | 5 | 1.26 | 2.25 |
| Sixty-nine Engages in (Sexual) | 5 | 1.26 | 2.25 |
| Anal Fingering Engages in (Sexual) | 2 | 2.05 | 2.25 |
| Anilingus Subject of (Sexual) | 2 | 2.05 | 2.25 |
| Penis Enlargement Subject of | 1 | 3.22 | 2.23 |
| Nipple Sucking Subject of (Sexual) | 4 | 1.38 | 2.23 |
| Dog Cosplay Engages in | 1 | 3.21 | 2.22 |
| Shoejob Subject of (Sexual) | 1 | 3.20 | 2.22 |
| Ankle Socks Clothes | 2 | 2.01 | 2.20 |
| 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 | 2.09 |
| Serious Personality | 3 | 1.49 | 2.06 |
| Sailor School Uniform Clothes | 3 | 1.48 | 2.05 |
| Big Breasts Body | 5 | 1.14 | 2.05 |
| Intercrural Sex Engages in (Sexual) | 2 | 1.85 | 2.03 |
| Reverse Spitroast Subject of (Sexual) | 2 | 1.84 | 2.02 |
| Parted in Middle Hair | 4 | 1.25 | 2.02 |
| Knee-high Boots Clothes | 2 | 1.83 | 2.01 |
| Shoejob Engages in (Sexual) | 1 | 2.90 | 2.01 |
| Blazer Clothes | 2 | 1.83 | 2.01 |
| Sitting Sex Engages in (Sexual) | 2 | 1.83 | 2.01 |
| Missionary Subject of (Sexual) | 5 | 1.12 | 2.00 |
| Bodysponge Subject of (Sexual) | 1 | 2.89 | 2.00 |
| Evening Gloves Clothes | 2 | 1.81 | 1.99 |
| Tribadism on Penis Subject of (Sexual) | 1 | 2.86 | 1.98 |
| Latex Thigh-high Boots Clothes | 1 | 2.86 | 1.98 |
| Petting With Object Subject of (Sexual) | 1 | 2.85 | 1.98 |
| Pantyhose Clothes | 3 | 1.42 | 1.97 |
| Prostate Massage Engages in (Sexual) | 1 | 2.84 | 1.97 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.77 | 1.94 |
| Fishnet Pantyhose Clothes | 1 | 2.79 | 1.94 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Buttjob Subject of (Sexual) | 1 | 2.79 | 1.93 |
| Hetare Personality | 1 | 2.78 | 1.93 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.39 | 1.92 |
| Latex Long Gloves Clothes | 1 | 2.77 | 1.92 |
| Tube Top Bra Clothes | 1 | 2.76 | 1.91 |
| Cheerleader Role | 1 | 2.76 | 1.91 |
| Knee-high Socks Clothes | 3 | 1.38 | 1.91 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Sports Shoes Clothes | 2 | 1.72 | 1.89 |
| Butterfly Subject of (Sexual) | 4 | 1.17 | 1.89 |
| Tominagi Subject of (Sexual) | 3 | 1.36 | 1.88 |
| Loafers Clothes | 2 | 1.71 | 1.88 |
| Anal Fingering Subject of (Sexual) | 2 | 1.71 | 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 | 1.86 |
| Balls Sucking Subject of (Sexual) | 1 | 2.68 | 1.85 |
| Strapless Leotard Clothes | 1 | 2.67 | 1.85 |
| Student Council Vice President Role | 1 | 2.66 | 1.84 |
| Strapless Mini-dress Clothes | 1 | 2.65 | 1.84 |
| Ahegao Engages in (Sexual) | 3 | 1.32 | 1.84 |
| Breast Smothering Engages in (Sexual) | 1 | 2.64 | 1.83 |
| Collar Clothes | 2 | 1.66 | 1.82 |
| T-shirt Clothes | 3 | 1.31 | 1.82 |
| Cheerleading Uniform Clothes | 1 | 2.62 | 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 |
| Piledriver Engages in (Sexual) | 1 | 2.55 | 1.77 |
| Senpai Role | 2 | 1.61 | 1.77 |
| Hair Beads Hair | 1 | 2.52 | 1.75 |
| Whip Items | 1 | 2.52 | 1.75 |
| Tube Top Clothes | 1 | 2.51 | 1.74 |
| Halterneck Dress Clothes | 1 | 2.50 | 1.73 |
| Sports Swimsuit Clothes | 1 | 2.49 | 1.73 |
| Boobjob Engages in (Sexual) | 4 | 1.07 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Cowgirl Subject of (Sexual) | 5 | 0.95 | 1.71 |
| School Nurse Role | 1 | 2.47 | 1.71 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.71 |
| Bunny Dress Clothes | 1 | 2.46 | 1.70 |
| Classmate Role | 3 | 1.23 | 1.70 |
| Peaked Cap Clothes | 1 | 2.45 | 1.70 |
| Slit Dress Clothes | 1 | 2.45 | 1.70 |
| Homeroom Teacher Role | 1 | 2.45 | 1.70 |
| Refined Personality | 2 | 1.54 | 1.69 |
| Latex Clothes | 1 | 2.43 | 1.68 |
| Step Sister Role | 1 | 2.43 | 1.68 |
| Pregnant Sex Engages in (Sexual) | 2 | 1.53 | 1.68 |
| Thigh-high Stockings Clothes | 4 | 1.04 | 1.68 |
| High School Student Role | 6 | 0.85 | 1.66 |
| Open Cup Bra Clothes | 1 | 2.38 | 1.65 |
| Adult Breast Feeding (obsolete) Engages in (Sexual) | 1 | 2.38 | 1.65 |
| Non-blood-related Brother Role | 1 | 2.37 | 1.65 |
| Swim Shorts Clothes | 1 | 2.37 | 1.65 |
| Anal Gaping Engages in (Sexual) | 1 | 2.37 | 1.64 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Penis Growth Subject of | 1 | 2.34 | 1.62 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.32 | 1.61 |
| Outdoor Sex Engages in (Sexual) | 3 | 1.16 | 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 | 2.26 | 1.57 |
| Athletics Engages in | 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 | 2.22 | 1.54 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Spoons Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Large Penis Body | 1 | 2.21 | 1.53 |
| Spats Clothes | 1 | 2.20 | 1.52 |
| Chinese Dress Clothes | 1 | 2.20 | 1.52 |
| Virgin Sex Engages in (Sexual) | 5 | 0.85 | 1.52 |
| Milking (Sexual) Subject of (Sexual) | 1 | 2.19 | 1.52 |
| Seventh Posture Engages in (Sexual) | 1 | 2.19 | 1.52 |
| Pissing Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Footjob Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Sexual Dominant Role | 1 | 2.17 | 1.50 |
| Quickie Fix Subject of (Sexual) | 3 | 1.08 | 1.50 |
| Shimapan Clothes | 1 | 2.13 | 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 | 2.10 | 1.46 |
| Old Type School Swimsuit Clothes | 1 | 2.09 | 1.45 |
| Ahoge Hair | 2 | 1.32 | 1.45 |
| Honor Student Role | 1 | 2.08 | 1.44 |
| Tiny Braid Hair | 1 | 2.07 | 1.43 |
| Student Council President Role | 1 | 2.07 | 1.43 |
| Honorable Personality | 1 | 2.06 | 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 |
| Hazel Eyes | 1 | 2.04 | 1.41 |
| Cloak Clothes | 1 | 2.04 | 1.41 |
| Turtleneck Sweater Clothes | 1 | 2.04 | 1.41 |
| Kemonomimi Headband Clothes | 1 | 2.04 | 1.41 |
| Optimist Personality | 1 | 2.03 | 1.41 |
| Hime Cut Hair | 1 | 2.02 | 1.40 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 2.01 | 1.39 |
| Spaulders Clothes | 1 | 2.01 | 1.39 |
| Anilingus Engages in (Sexual) | 1 | 2.01 | 1.39 |
| Yamato Nadeshiko Role | 1 | 2.00 | 1.38 |
| Vibrator Subject of (Sexual) | 1 | 1.98 | 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 |
| Tomboy Personality | 1 | 1.96 | 1.36 |
| High Heeled Shoes Clothes | 1 | 1.96 | 1.36 |
| Sandals Clothes | 1 | 1.94 | 1.34 |
| Friendly Personality | 2 | 1.22 | 1.34 |
| Airhead Personality | 1 | 1.92 | 1.33 |
| Cravat Clothes | 1 | 1.92 | 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 | 1.31 |
| Standing Sex Engages in (Sexual) | 1 | 1.87 | 1.30 |
| Bra Clothes | 1 | 1.87 | 1.29 |
| Twin Braids Hair | 1 | 1.86 | 1.29 |
| Doggy Style Subject of (Sexual) | 3 | 0.93 | 1.28 |
| Honest Personality | 1 | 1.84 | 1.27 |
| Pink Rotor Subject of (Sexual) | 1 | 1.83 | 1.27 |
| Flirting Engages in | 1 | 1.80 | 1.25 |
| Lab Coat Clothes | 1 | 1.80 | 1.25 |
| Short Shorts Clothes | 1 | 1.77 | 1.23 |
| Necktie Clothes | 2 | 1.11 | 1.22 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.22 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| School Uniform Clothes | 4 | 0.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Teen Body | 6 | 0.62 | 1.21 |
| Mischievous Personality | 1 | 1.73 | 1.20 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.70 | 1.18 |
| 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 | 1.69 | 1.17 |
| Boots Clothes | 1 | 1.68 | 1.16 |
| Intake Hair | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Ribbon Hair Accessory Clothes | 1 | 1.65 | 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 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.62 | 1.12 |
| Pink Eyes | 1 | 1.62 | 1.12 |
| Green Eyes | 2 | 1.02 | 1.12 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Apron Clothes | 1 | 1.59 | 1.10 |
| Jeans Clothes | 1 | 1.56 | 1.08 |
| Older Sister Role | 1 | 1.56 | 1.08 |
| Sidehair Hair | 2 | 0.98 | 1.07 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.06 |
| Energetic Personality | 1 | 1.52 | 1.05 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Choker Clothes | 1 | 1.50 | 1.04 |
| Long Hair | 3 | 0.75 | 1.04 |
| Straight Hair | 2 | 0.95 | 1.04 |
| Green Hair | 1 | 1.48 | 1.02 |
| Blouse Clothes | 1 | 1.47 | 1.02 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.02 |
| Headband Clothes | 1 | 1.45 | 1.00 |
| Teasing Engages in | 1 | 1.45 | 1.00 |
| Not a Virgin Role | 1 | 1.42 | 0.99 |
| Black Eyes | 1 | 1.42 | 0.99 |
| Tank Top Clothes | 1 | 1.42 | 0.98 |
| Jacket Clothes | 1 | 1.42 | 0.98 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| V Bangs Hair | 1 | 1.41 | 0.98 |
| Blond Hair | 2 | 0.89 | 0.97 |
| Pleated Skirt Clothes | 1 | 1.40 | 0.97 |
| Masturbation Engages in (Sexual) | 1 | 1.39 | 0.96 |
| Tsurime Eyes | 1 | 1.38 | 0.96 |
| Hosome Eyes | 1 | 1.37 | 0.95 |
| Not Sexually Involved Engages in (Sexual) | 1 | 1.36 | 0.94 |
| Slim Body | 4 | 0.58 | 0.93 |
| Pink Hair | 1 | 1.33 | 0.92 |
| Belt Clothes | 1 | 1.27 | 0.88 |
| Watashi Personality | 1 | 1.26 | 0.87 |
| Dress Clothes | 1 | 1.25 | 0.87 |
| Ribbon Tie Clothes | 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 |
| Pale Body | 7 | 0.37 | 0.77 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Parted to Side Hair | 1 | 1.05 | 0.73 |
| Violet Eyes | 1 | 1.04 | 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 |
| 2 | 0.00 | 0.00 |