Average Rating:7.24
Bayesian Rating:7.16
Total Votes:84
Updated 22 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!
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Sex in School Infirmary Engages in (Sexual) | 5 | 2.24 | 4.01 |
| Breast Expansion Subject of | 4 | 2.41 | 3.88 |
| 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 | 3.51 |
| Thong Panties Clothes | 3 | 2.38 | 3.30 |
| Ball-cupping Engages in (Sexual) | 3 | 2.36 | 3.27 |
| Sex in Classroom Engages in (Sexual) | 6 | 1.61 | 3.13 |
| Nipple Sucking Engages in (Sexual) | 5 | 1.72 | 3.07 |
| Sex in Front of an Audience Engages in (Sexual) | 6 | 1.51 | 2.94 |
| Adult Breast Feeding (obsolete) Subject of (Sexual) | 2 | 2.63 | 2.89 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.59 | 2.86 |
| Nipple Teasing Engages in (Sexual) | 3 | 2.04 | 2.83 |
| Gokkun Engages in (Sexual) | 3 | 2.03 | 2.81 |
| French Kiss Engages in (Sexual) | 5 | 1.52 | 2.73 |
| Buttjob Engages in (Sexual) | 2 | 2.41 | 2.65 |
| Bellyjob Subject of (Sexual) | 1 | 3.77 | 2.62 |
| Bodysponge Engages in (Sexual) | 2 | 2.38 | 2.62 |
| Magic Wand Subject of (Sexual) | 2 | 2.37 | 2.60 |
| Student Council Member Role | 2 | 2.36 | 2.59 |
| Microskirt Clothes | 2 | 2.35 | 2.58 |
| High Heeled Boots Clothes | 2 | 2.27 | 2.50 |
| Female Ejaculation Engages in (Sexual) | 5 | 1.38 | 2.47 |
| Sexual Cosplay Engages in (Sexual) | 2 | 2.24 | 2.47 |
| Brooch Clothes | 2 | 2.23 | 2.45 |
| Torn Pantyhose (damaged) Clothes | 2 | 2.21 | 2.42 |
| Bukkake Subject of (Sexual) | 5 | 1.34 | 2.41 |
| Reverse Missionary Subject of (Sexual) | 3 | 1.73 | 2.40 |
| Mules Clothes | 1 | 3.44 | 2.39 |
| Non-blood-related Incest Engages in (Sexual) | 2 | 2.17 | 2.38 |
| Sport Bloomers Clothes | 3 | 1.71 | 2.37 |
| Seventh Posture Subject of (Sexual) | 4 | 1.45 | 2.34 |
| Court Shoes Clothes | 2 | 2.12 | 2.33 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.19 | 2.32 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.08 | 2.29 |
| Reverse Cowgirl Subject of (Sexual) | 3 | 1.64 | 2.27 |
| Anal Fingering Engages in (Sexual) | 2 | 2.06 | 2.27 |
| Penis Enlargement Subject of | 1 | 3.27 | 2.27 |
| Sex in Public Places Engages in (Sexual) | 5 | 1.26 | 2.26 |
| Anilingus Subject of (Sexual) | 2 | 2.05 | 2.26 |
| Boobs on Fence Subject of (Sexual) | 1 | 3.26 | 2.26 |
| Bellyjob Engages in (Sexual) | 1 | 3.26 | 2.26 |
| Sixty-nine Engages in (Sexual) | 5 | 1.25 | 2.24 |
| Nipple Sucking Subject of (Sexual) | 4 | 1.39 | 2.24 |
| Shoejob Subject of (Sexual) | 1 | 3.22 | 2.23 |
| Dog Cosplay Engages in | 1 | 3.21 | 2.23 |
| Ankle Socks Clothes | 2 | 2.00 | 2.20 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.96 | 2.15 |
| Piledriver Subject of (Sexual) | 2 | 1.95 | 2.14 |
| Big Breasts Body | 5 | 1.19 | 2.12 |
| Mutual Masturbation Engages in (Sexual) | 2 | 1.93 | 2.12 |
| Cunnilingus Subject of (Sexual) | 5 | 1.17 | 2.10 |
| Paw Gloves Clothes | 1 | 3.02 | 2.09 |
| Serious Personality | 3 | 1.50 | 2.08 |
| Sailor School Uniform Clothes | 3 | 1.48 | 2.05 |
| Knee-high Boots Clothes | 2 | 1.85 | 2.04 |
| Intercrural Sex Engages in (Sexual) | 2 | 1.85 | 2.04 |
| Reverse Spitroast Subject of (Sexual) | 2 | 1.85 | 2.03 |
| Shoejob Engages in (Sexual) | 1 | 2.92 | 2.02 |
| Parted in Middle Hair | 4 | 1.26 | 2.02 |
| Sitting Sex Engages in (Sexual) | 2 | 1.83 | 2.01 |
| Blazer Clothes | 2 | 1.83 | 2.01 |
| Bodysponge Subject of (Sexual) | 1 | 2.89 | 2.00 |
| Missionary Subject of (Sexual) | 5 | 1.11 | 2.00 |
| Petting With Object Subject of (Sexual) | 1 | 2.88 | 1.99 |
| Latex Thigh-high Boots Clothes | 1 | 2.87 | 1.99 |
| Tribadism on Penis Subject of (Sexual) | 1 | 2.86 | 1.98 |
| Fishnet Pantyhose Clothes | 1 | 2.86 | 1.98 |
| Evening Gloves Clothes | 2 | 1.80 | 1.98 |
| Prostate Massage Engages in (Sexual) | 1 | 2.84 | 1.97 |
| Pantyhose Clothes | 3 | 1.42 | 1.97 |
| Buttjob Subject of (Sexual) | 1 | 2.81 | 1.95 |
| Tube Top Bra Clothes | 1 | 2.80 | 1.94 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.76 | 1.94 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.40 | 1.93 |
| Vaginal Fingering Subject of (Sexual) | 5 | 1.08 | 1.93 |
| Hetare Personality | 1 | 2.78 | 1.92 |
| Latex Long Gloves Clothes | 1 | 2.77 | 1.92 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.92 |
| Cheerleader Role | 1 | 2.76 | 1.91 |
| Sports Shoes Clothes | 2 | 1.73 | 1.90 |
| Knee-high Socks Clothes | 3 | 1.37 | 1.90 |
| Loafers Clothes | 2 | 1.72 | 1.89 |
| Butterfly Subject of (Sexual) | 4 | 1.17 | 1.89 |
| 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 | 1.87 |
| Balls Sucking Subject of (Sexual) | 1 | 2.69 | 1.87 |
| Strapless Mini-dress Clothes | 1 | 2.69 | 1.86 |
| Strapless Leotard Clothes | 1 | 2.68 | 1.86 |
| Pubic Hair Hair | 3 | 1.34 | 1.86 |
| Twin Boobjob Subject of (Sexual) | 1 | 2.67 | 1.85 |
| Breast Smothering Engages in (Sexual) | 1 | 2.67 | 1.85 |
| Ahegao Engages in (Sexual) | 3 | 1.33 | 1.84 |
| Student Council Vice President Role | 1 | 2.65 | 1.84 |
| Cheerleading Uniform Clothes | 1 | 2.64 | 1.83 |
| T-shirt Clothes | 3 | 1.32 | 1.83 |
| Bunnygirl Cosplay Engages in | 1 | 2.63 | 1.82 |
| Collar Clothes | 2 | 1.64 | 1.80 |
| Pantyjob Engages in (Sexual) | 1 | 2.59 | 1.80 |
| Piledriver Engages in (Sexual) | 1 | 2.58 | 1.79 |
| Kouhai Role | 2 | 1.62 | 1.78 |
| Senpai Role | 2 | 1.61 | 1.76 |
| Tube Top Clothes | 1 | 2.55 | 1.76 |
| Hair Beads Hair | 1 | 2.52 | 1.75 |
| Whip Items | 1 | 2.51 | 1.74 |
| Halterneck Dress Clothes | 1 | 2.50 | 1.73 |
| Sports Swimsuit Clothes | 1 | 2.50 | 1.73 |
| Cunnilingus Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.71 |
| Boobjob Engages in (Sexual) | 4 | 1.06 | 1.71 |
| Refined Personality | 2 | 1.55 | 1.71 |
| Bunny Dress Clothes | 1 | 2.46 | 1.71 |
| Cowgirl Subject of (Sexual) | 5 | 0.95 | 1.71 |
| Slit Dress Clothes | 1 | 2.46 | 1.70 |
| Classmate Role | 3 | 1.23 | 1.70 |
| School Nurse Role | 1 | 2.46 | 1.70 |
| Homeroom Teacher Role | 1 | 2.45 | 1.70 |
| Peaked Cap Clothes | 1 | 2.44 | 1.69 |
| Step Sister Role | 1 | 2.44 | 1.69 |
| Pregnant Sex Engages in (Sexual) | 2 | 1.53 | 1.68 |
| Latex Clothes | 1 | 2.42 | 1.68 |
| Thigh-high Stockings Clothes | 4 | 1.03 | 1.67 |
| Swim Shorts Clothes | 1 | 2.40 | 1.66 |
| Anal Gaping Engages in (Sexual) | 1 | 2.40 | 1.66 |
| Open Cup Bra Clothes | 1 | 2.39 | 1.66 |
| Non-blood-related Brother Role | 1 | 2.38 | 1.65 |
| High School Student Role | 6 | 0.84 | 1.63 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Penis Growth Subject of | 1 | 2.33 | 1.62 |
| Twin Blowjob Subject of (Sexual) | 1 | 2.33 | 1.62 |
| Outdoor Sex Engages in (Sexual) | 3 | 1.16 | 1.60 |
| Sex on Roof Engages in (Sexual) | 1 | 2.30 | 1.59 |
| Balls Sucking Engages in (Sexual) | 1 | 2.27 | 1.58 |
| Pissing on Others Engages in (Sexual) | 1 | 2.26 | 1.57 |
| Athletics Engages in | 1 | 2.26 | 1.56 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.24 | 1.56 |
| Large Penis Body | 1 | 2.24 | 1.56 |
| Gloves Clothes | 2 | 1.42 | 1.55 |
| Adult Breast Feeding (obsolete) Engages in (Sexual) | 1 | 2.24 | 1.55 |
| Spoons Engages in (Sexual) | 1 | 2.23 | 1.55 |
| Blowjob Duck Face Engages in (Sexual) | 1 | 2.23 | 1.54 |
| Milking (Sexual) Subject of (Sexual) | 1 | 2.21 | 1.53 |
| Rubber Band With Beads Clothes | 1 | 2.21 | 1.53 |
| Chinese Dress Clothes | 1 | 2.20 | 1.52 |
| Seventh Posture Engages in (Sexual) | 1 | 2.20 | 1.52 |
| Spats Clothes | 1 | 2.19 | 1.52 |
| Pissing Subject of (Sexual) | 1 | 2.19 | 1.51 |
| Virgin Sex Engages in (Sexual) | 5 | 0.84 | 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 | 1.49 |
| Mary Jane Clothes | 1 | 2.12 | 1.47 |
| Shimapan Clothes | 1 | 2.12 | 1.47 |
| Sitting Sex Subject of (Sexual) | 3 | 1.06 | 1.46 |
| Petplay Subject of (Sexual) | 1 | 2.10 | 1.45 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 2.09 | 1.45 |
| Ahoge Hair | 2 | 1.31 | 1.44 |
| Honor Student Role | 1 | 2.08 | 1.44 |
| Old Type School Swimsuit Clothes | 1 | 2.08 | 1.44 |
| Honorable Personality | 1 | 2.08 | 1.44 |
| Tiny Braid Hair | 1 | 2.07 | 1.43 |
| Vibrator Subject of (Sexual) | 1 | 2.06 | 1.43 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Student Council President Role | 1 | 2.06 | 1.43 |
| Yamato Nadeshiko Role | 1 | 2.06 | 1.43 |
| Curtained Hair | 2 | 1.30 | 1.42 |
| Turtleneck Sweater Clothes | 1 | 2.05 | 1.42 |
| Optimist Personality | 1 | 2.04 | 1.41 |
| Hazel Eyes | 1 | 2.04 | 1.41 |
| Bow Tie Clothes | 1 | 2.04 | 1.41 |
| Cloak Clothes | 1 | 2.03 | 1.41 |
| Hime Cut Hair | 1 | 2.03 | 1.40 |
| Spaulders Clothes | 1 | 2.02 | 1.40 |
| Kemonomimi Headband Clothes | 1 | 2.02 | 1.40 |
| Anilingus Engages in (Sexual) | 1 | 2.01 | 1.40 |
| High Heeled Shoes Clothes | 1 | 2.00 | 1.39 |
| Facesitting Engages in (Sexual) | 1 | 2.00 | 1.38 |
| Decorative Belt Clothes | 1 | 1.97 | 1.37 |
| Tomboy Personality | 1 | 1.97 | 1.37 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.36 |
| Sandals Clothes | 1 | 1.96 | 1.36 |
| Friendly Personality | 2 | 1.23 | 1.35 |
| Friend Role | 2 | 1.21 | 1.33 |
| Masturbation in front of an Audience Engages in (Sexual) | 1 | 1.92 | 1.33 |
| Cravat Clothes | 1 | 1.92 | 1.33 |
| Airhead Personality | 1 | 1.91 | 1.33 |
| Younger Brother Role | 1 | 1.90 | 1.32 |
| Bra Clothes | 1 | 1.90 | 1.32 |
| Quickie Fix Engages in (Sexual) | 1 | 1.89 | 1.31 |
| Standing Sex Engages in (Sexual) | 1 | 1.89 | 1.31 |
| Twin Braids Hair | 1 | 1.86 | 1.29 |
| Doggy Style Subject of (Sexual) | 3 | 0.92 | 1.28 |
| Honest Personality | 1 | 1.84 | 1.28 |
| Pink Rotor Subject of (Sexual) | 1 | 1.83 | 1.27 |
| Flirting Engages in | 1 | 1.81 | 1.26 |
| Short Shorts Clothes | 1 | 1.79 | 1.24 |
| Lab Coat Clothes | 1 | 1.79 | 1.24 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.77 | 1.23 |
| Necktie Clothes | 2 | 1.11 | 1.22 |
| Handjob Subject of (Sexual) | 1 | 1.76 | 1.22 |
| Missionary Engages in (Sexual) | 1 | 1.75 | 1.21 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Mischievous Personality | 1 | 1.74 | 1.21 |
| Cowgirl Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Teen Body | 6 | 0.61 | 1.19 |
| Footjob Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Naive Personality | 1 | 1.71 | 1.18 |
| School Uniform Clothes | 4 | 0.74 | 1.18 |
| Doggy Style Engages in (Sexual) | 1 | 1.70 | 1.18 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Miniskirt Clothes | 2 | 1.07 | 1.17 |
| Boots Clothes | 1 | 1.68 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Intake Hair | 1 | 1.67 | 1.15 |
| Pervert Personality | 1 | 1.65 | 1.14 |
| Kind Personality | 2 | 1.04 | 1.14 |
| Relaxed Personality | 1 | 1.64 | 1.14 |
| Ribbon Hair Accessory Clothes | 1 | 1.64 | 1.14 |
| Mini-dress Clothes | 1 | 1.63 | 1.13 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.62 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.62 | 1.12 |
| Pink Eyes | 1 | 1.61 | 1.12 |
| Green Eyes | 2 | 1.01 | 1.11 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Jeans Clothes | 1 | 1.58 | 1.09 |
| Apron Clothes | 1 | 1.58 | 1.09 |
| Older Sister Role | 1 | 1.55 | 1.08 |
| Sidehair Hair | 2 | 0.98 | 1.07 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Blowjob Subject of (Sexual) | 1 | 1.53 | 1.06 |
| Energetic Personality | 1 | 1.53 | 1.06 |
| Straight Hair | 2 | 0.96 | 1.05 |
| Choker Clothes | 1 | 1.51 | 1.05 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Long Hair | 3 | 0.75 | 1.04 |
| Blouse Clothes | 1 | 1.48 | 1.03 |
| Green Hair | 1 | 1.47 | 1.02 |
| Teasing Engages in | 1 | 1.46 | 1.01 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.01 |
| Not a Virgin Role | 1 | 1.45 | 1.00 |
| Headband Clothes | 1 | 1.44 | 1.00 |
| Tank Top Clothes | 1 | 1.43 | 0.99 |
| Black Eyes | 1 | 1.43 | 0.99 |
| Jacket Clothes | 1 | 1.42 | 0.98 |
| V Bangs Hair | 1 | 1.42 | 0.98 |
| Pleated Skirt Clothes | 1 | 1.41 | 0.98 |
| Cooking Engages in | 1 | 1.41 | 0.98 |
| Blond Hair | 2 | 0.88 | 0.97 |
| Tsurime Eyes | 1 | 1.38 | 0.95 |
| Masturbation Engages in (Sexual) | 1 | 1.37 | 0.95 |
| Hosome Eyes | 1 | 1.36 | 0.94 |
| Not Sexually Involved Engages in (Sexual) | 1 | 1.36 | 0.94 |
| Slim Body | 4 | 0.57 | 0.92 |
| Pink Hair | 1 | 1.32 | 0.92 |
| Belt Clothes | 1 | 1.28 | 0.89 |
| Watashi Personality | 1 | 1.26 | 0.88 |
| Ribbon Tie Clothes | 1 | 1.24 | 0.86 |
| Dress Clothes | 1 | 1.24 | 0.86 |
| Short Hair | 3 | 0.61 | 0.84 |
| Blue Hair | 1 | 1.19 | 0.82 |
| Shirt Clothes | 1 | 1.16 | 0.80 |
| Twin Tails Hair | 1 | 1.12 | 0.78 |
| Pale Body | 7 | 0.37 | 0.77 |
| Glasses Clothes | 1 | 1.08 | 0.75 |
| Parted to Side Hair | 1 | 1.07 | 0.74 |
| Violet Eyes | 1 | 1.04 | 0.72 |
| Black Hair | 1 | 0.81 | 0.56 |
| Waist Length+ Hair | 1 | 0.80 | 0.55 |
| Blue Eyes | 1 | 0.80 | 0.55 |
| Young-adult Body | 1 | 0.77 | 0.54 |
| Brown Hair | 1 | 0.68 | 0.47 |
| 2 | 0.00 | 0.00 |