Average Rating:7.19
Bayesian Rating:7.09
Total Votes:89
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 | 2.51 | 3.49 |
| Nipple Sucking Engages in (Sexual) | 6 | 1.69 | 3.28 |
| Nipple Teasing Engages in (Sexual) | 4 | 1.99 | 3.20 |
| Ball-cupping Engages in (Sexual) | 3 | 2.30 | 3.19 |
| Thong Panties Clothes | 3 | 2.26 | 3.13 |
| Sex at School Engages in (Sexual) | 6 | 1.54 | 3.00 |
| Sex in Front of an Audience Engages in (Sexual) | 6 | 1.49 | 2.91 |
| Gokkun Engages in (Sexual) | 3 | 2.05 | 2.85 |
| Nipple Teasing Subject of (Sexual) | 5 | 1.55 | 2.77 |
| Bellyjob Subject of (Sexual) | 1 | 3.80 | 2.63 |
| Buttjob Engages in (Sexual) | 2 | 2.38 | 2.62 |
| Magic Wand Subject of (Sexual) | 2 | 2.38 | 2.61 |
| Student Council Member Role | 2 | 2.38 | 2.61 |
| Bodysponge Engages in (Sexual) | 2 | 2.37 | 2.60 |
| French Kiss Engages in (Sexual) | 5 | 1.44 | 2.59 |
| Microskirt Clothes | 2 | 2.35 | 2.58 |
| Sexual Cosplay Engages in (Sexual) | 2 | 2.24 | 2.46 |
| High Heeled Boots Clothes | 2 | 2.24 | 2.46 |
| 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 | 1.34 | 2.41 |
| Reverse Missionary Subject of (Sexual) | 3 | 1.74 | 2.41 |
| Mules Clothes | 1 | 3.46 | 2.40 |
| 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 | 1.47 | 2.36 |
| Court Shoes Clothes | 2 | 2.10 | 2.30 |
| Tribadism on Penis Engages in (Sexual) | 2 | 2.07 | 2.28 |
| Boobs on Fence Subject of (Sexual) | 1 | 3.28 | 2.27 |
| Bellyjob Engages in (Sexual) | 1 | 3.27 | 2.27 |
| Sixty-nine Engages in (Sexual) | 5 | 1.27 | 2.27 |
| Reverse Cowgirl Subject of (Sexual) | 3 | 1.63 | 2.25 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.16 | 2.25 |
| Sex in Public Places Engages in (Sexual) | 5 | 1.26 | 2.25 |
| Anilingus Subject of (Sexual) | 2 | 2.04 | 2.25 |
| Anal Fingering Engages in (Sexual) | 2 | 2.04 | 2.24 |
| Shoejob Subject of (Sexual) | 1 | 3.22 | 2.23 |
| Ankle Socks Clothes | 2 | 2.02 | 2.22 |
| Nipple Sucking Subject of (Sexual) | 4 | 1.37 | 2.21 |
| Dog Cosplay Engages in | 1 | 3.18 | 2.21 |
| Vaginal Gaping Engages in (Sexual) | 2 | 1.95 | 2.14 |
| Mutual Masturbation Engages in (Sexual) | 2 | 1.94 | 2.13 |
| Piledriver Subject of (Sexual) | 2 | 1.94 | 2.13 |
| Paw Gloves Clothes | 1 | 3.04 | 2.10 |
| Cunnilingus Subject of (Sexual) | 5 | 1.16 | 2.08 |
| Serious Personality | 3 | 1.48 | 2.05 |
| Sailor School Uniform Clothes | 3 | 1.48 | 2.05 |
| 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 |
| Sitting Sex Engages in (Sexual) | 2 | 1.82 | 2.00 |
| Knee-high Boots Clothes | 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 | 2.85 | 1.98 |
| Tribadism on Penis Subject of (Sexual) | 1 | 2.85 | 1.98 |
| Latex Thigh-high Boots Clothes | 1 | 2.85 | 1.97 |
| Big Breasts Body | 5 | 1.10 | 1.97 |
| Twin Boobjob Engages in (Sexual) | 2 | 1.77 | 1.95 |
| Prostate Massage Engages in (Sexual) | 1 | 2.80 | 1.94 |
| 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 |
| Bathroom Sex Engages in (Sexual) | 3 | 1.38 | 1.92 |
| Buttjob Subject of (Sexual) | 1 | 2.76 | 1.91 |
| Fishnet Pantyhose Clothes | 1 | 2.76 | 1.91 |
| 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 |
| Anal Fingering Subject of (Sexual) | 2 | 1.71 | 1.88 |
| Tominagi Subject of (Sexual) | 3 | 1.35 | 1.88 |
| Loafers Clothes | 2 | 1.71 | 1.88 |
| Sports Shoes Clothes | 2 | 1.71 | 1.87 |
| Tube Top Bra Clothes | 1 | 2.70 | 1.87 |
| Twin Boobjob Subject of (Sexual) | 1 | 2.68 | 1.86 |
| Handjob Engages in (Sexual) | 4 | 1.15 | 1.85 |
| Pubic Hair Hair | 3 | 1.34 | 1.85 |
| Student Council Vice President Role | 1 | 2.67 | 1.85 |
| Balls Sucking Subject of (Sexual) | 1 | 2.67 | 1.85 |
| Collar Clothes | 2 | 1.68 | 1.84 |
| Strapless Leotard Clothes | 1 | 2.66 | 1.84 |
| Ahegao Engages in (Sexual) | 3 | 1.31 | 1.82 |
| T-shirt Clothes | 3 | 1.31 | 1.81 |
| Breast Smothering Engages in (Sexual) | 1 | 2.61 | 1.81 |
| Cheerleading Uniform Clothes | 1 | 2.60 | 1.80 |
| Pantyjob Engages in (Sexual) | 1 | 2.60 | 1.80 |
| Strapless Mini-dress Clothes | 1 | 2.60 | 1.80 |
| Kouhai Role | 2 | 1.64 | 1.80 |
| Bunnygirl Cosplay Engages in | 1 | 2.59 | 1.80 |
| Senpai Role | 2 | 1.62 | 1.78 |
| Piledriver Engages in (Sexual) | 1 | 2.55 | 1.77 |
| Hair Beads Hair | 1 | 2.54 | 1.76 |
| Halterneck Dress Clothes | 1 | 2.52 | 1.75 |
| Whip Items | 1 | 2.52 | 1.75 |
| Boobjob Engages in (Sexual) | 4 | 1.07 | 1.73 |
| Sports Swimsuit Clothes | 1 | 2.48 | 1.72 |
| Sex in Water Engages in (Sexual) | 2 | 1.56 | 1.72 |
| Cowgirl Subject of (Sexual) | 5 | 0.96 | 1.71 |
| Classmate Role | 3 | 1.23 | 1.71 |
| Peaked Cap Clothes | 1 | 2.47 | 1.71 |
| School Nurse Role | 1 | 2.47 | 1.71 |
| Bunny Dress Clothes | 1 | 2.46 | 1.70 |
| Homeroom Teacher Role | 1 | 2.46 | 1.70 |
| Tube Top Clothes | 1 | 2.46 | 1.70 |
| Slit Dress Clothes | 1 | 2.45 | 1.70 |
| Cunnilingus Engages in (Sexual) | 2 | 1.55 | 1.70 |
| Refined Personality | 2 | 1.54 | 1.70 |
| Latex Clothes | 1 | 2.44 | 1.69 |
| Thigh-high Stockings Clothes | 4 | 1.05 | 1.69 |
| Step Sister Role | 1 | 2.44 | 1.69 |
| Sex while Being Pregnant Engages in (Sexual) | 2 | 1.54 | 1.69 |
| High School Student Role | 6 | 0.87 | 1.68 |
| Straight Hair | 5 | 0.94 | 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 |
| Standing Sex Subject of (Sexual) | 3 | 1.18 | 1.63 |
| Anal Gaping Engages in (Sexual) | 1 | 2.35 | 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 | 2.28 | 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 |
| Rubber Band With Beads Clothes | 1 | 2.24 | 1.55 |
| Gloves Clothes | 2 | 1.41 | 1.55 |
| Blowjob Duck Face Engages in (Sexual) | 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 | 0.86 | 1.53 |
| Spoons Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Chinese Dress Clothes | 1 | 2.20 | 1.53 |
| Spats Clothes | 1 | 2.20 | 1.53 |
| Milking (Sexual) Subject of (Sexual) | 1 | 2.19 | 1.52 |
| Large Penis Body | 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 | 2.17 | 1.51 |
| Quickie Fix Subject of (Sexual) | 3 | 1.08 | 1.50 |
| Sexual Dominant Role | 1 | 2.16 | 1.49 |
| Shimapan Clothes | 1 | 2.14 | 1.49 |
| Sitting Sex Subject of (Sexual) | 3 | 1.06 | 1.48 |
| Mary Jane Clothes | 1 | 2.13 | 1.47 |
| Ahoge Hair | 2 | 1.33 | 1.46 |
| Petplay Subject of (Sexual) | 1 | 2.11 | 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 | 2.04 | 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 |
| Anilingus Engages in (Sexual) | 1 | 2.00 | 1.38 |
| Spaulders Clothes | 1 | 1.99 | 1.38 |
| Yamato Nadeshiko Role | 1 | 1.99 | 1.38 |
| Decorative Belt Clothes | 1 | 1.98 | 1.37 |
| Blowjob Engages in (Sexual) | 5 | 0.76 | 1.37 |
| Parted in Middle Hair | 2 | 1.24 | 1.36 |
| Facesitting Engages in (Sexual) | 1 | 1.96 | 1.36 |
| Vaginal Object Insertion Subject of (Sexual) | 1 | 1.95 | 1.35 |
| Tomboy Personality | 1 | 1.95 | 1.35 |
| Vibrator Subject of (Sexual) | 1 | 1.94 | 1.34 |
| High Heeled Shoes Clothes | 1 | 1.93 | 1.33 |
| Cravat Clothes | 1 | 1.92 | 1.33 |
| Airhead Personality | 1 | 1.91 | 1.33 |
| Sandals Clothes | 1 | 1.91 | 1.32 |
| Friendly Personality | 2 | 1.21 | 1.32 |
| Masturbation in front of an Audience Engages in (Sexual) | 1 | 1.91 | 1.32 |
| Younger Brother Role | 1 | 1.90 | 1.32 |
| Friend Role | 2 | 1.19 | 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 | 1.82 | 1.26 |
| Bra Clothes | 1 | 1.82 | 1.26 |
| Lab Coat Clothes | 1 | 1.80 | 1.24 |
| School Uniform Clothes | 4 | 0.77 | 1.24 |
| Flirting Engages in | 1 | 1.78 | 1.23 |
| Necktie Clothes | 2 | 1.12 | 1.23 |
| Teen Body | 6 | 0.62 | 1.21 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Handjob Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Skirt Suit Clothes | 1 | 1.74 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Short Shorts Clothes | 1 | 1.73 | 1.20 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Mischievous Personality | 1 | 1.71 | 1.19 |
| Cowgirl Engages in (Sexual) | 1 | 1.71 | 1.19 |
| Intake Hair | 1 | 1.69 | 1.17 |
| Mysterious Personality | 1 | 1.69 | 1.17 |
| Miniskirt Clothes | 2 | 1.06 | 1.17 |
| Naive Personality | 1 | 1.68 | 1.17 |
| Doggy Style Engages in (Sexual) | 1 | 1.68 | 1.16 |
| Boots Clothes | 1 | 1.67 | 1.16 |
| Ribbon Hair Accessory Clothes | 1 | 1.67 | 1.16 |
| Spoons Subject of (Sexual) | 1 | 1.67 | 1.16 |
| Mini-dress Clothes | 1 | 1.64 | 1.14 |
| Relaxed Personality | 1 | 1.63 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.63 | 1.13 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.63 | 1.13 |
| Pink Eyes | 1 | 1.63 | 1.13 |
| Green Eyes | 2 | 1.02 | 1.12 |
| Kind Personality | 2 | 1.02 | 1.12 |
| Slim Body | 6 | 0.57 | 1.12 |
| Pervert Personality | 1 | 1.61 | 1.12 |
| Vaginal Fingering Engages in (Sexual) | 1 | 1.61 | 1.12 |
| Apron Clothes | 1 | 1.59 | 1.10 |
| Lactation Engages in | 1 | 1.59 | 1.10 |
| Spiky Bangs Hair | 2 | 0.99 | 1.09 |
| Sidehair Hair | 2 | 0.98 | 1.08 |
| Older Sister Role | 1 | 1.56 | 1.08 |
| Jeans Clothes | 1 | 1.54 | 1.07 |
| Hard Worker Personality | 1 | 1.53 | 1.06 |
| Energetic Personality | 1 | 1.52 | 1.05 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.05 |
| Maid's Dress Clothes | 1 | 1.52 | 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 | 1.42 | 0.99 |
| Cooking Engages in | 1 | 1.42 | 0.98 |
| Black Eyes | 1 | 1.41 | 0.98 |
| Blond Hair | 2 | 0.89 | 0.98 |
| Jacket Clothes | 1 | 1.41 | 0.98 |
| Masturbation Engages in (Sexual) | 1 | 1.40 | 0.97 |
| Not a Virgin Role | 1 | 1.40 | 0.97 |
| Pleated Skirt Clothes | 1 | 1.39 | 0.97 |
| Tank Top Clothes | 1 | 1.39 | 0.97 |
| Tsurime Eyes | 1 | 1.39 | 0.96 |
| Hosome Eyes | 1 | 1.37 | 0.95 |
| Wavy Hair | 1 | 1.35 | 0.94 |
| Not Sexually Involved Engages in | 1 | 1.35 | 0.94 |
| Pink Hair | 1 | 1.34 | 0.93 |
| Belt Clothes | 1 | 1.26 | 0.88 |
| Ribbon Tie Clothes | 1 | 1.26 | 0.87 |
| Dress 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 | 1.09 | 0.75 |
| Violet Eyes | 1 | 1.05 | 0.73 |
| Amber Eyes | 1 | 1.04 | 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 |
Updated 1 month ago