---
title: "Love Love Boin Imouto no Kyonyuu"
description: "Our protagonist, Umino Kousuke, is a third-year student at Shunpu Academy. His father is on a business trip overseas, and his mother has been staying with his f"
image: "https://t.vndb.org/cv/58/5358.jpg"
---

# Love Love Boin Imouto no Kyonyuu

![Love Love Boin Imouto no Kyonyuu](https://t.vndb.org/cv/58/5358.jpg)

**Alternative Title:** らぶらぶボイン 妹の巨乳

**Aliases:** Lovelove Boin - pretty sister's boobs

**Developer:** flap

**Release date:** Sep 22, 2006

**Platform:** Windows

**Language:** Japanese

**Rating:** 6.1/10 (7 votes)

## Description
Our protagonist, Umino Kousuke, is a third-year student at Shunpu Academy. His father is on a business trip overseas, and his mother has been staying with his father since April, so he currently lives with his step-sister, Kotomi. After three months, he's gotten used to living alone with her, but his mother soon will return.

Kotomi is petite, 155cm tall, but she has a pretty big bust...no, huge breasts. What's more, she seems to be madly in love with the protagonist.

The "accident" he had hoped for didn't happen, but that doesn't mean Kousuke dislikes Kotomi. But he's the older brother. Kotomi is the younger sister. He's a contrary character who can't be honest with himself.

In an attempt to win over her "big brother," Kotomi climbs on top of him every morning to wake him up, and when they go to school, she crosses his arms and presses her chest against him, aggressively attacking him. So, what will be Kousuke's fate...?

[From [Getchu](https://www.getchu.com/soft.phtml?id=471025)]

## Characters
### Umino Kousuke (海野 宏祐)
- **Gender:** Male
- **Role:** Older Brother

### Umino Kotomi (海野 ことみ)
- **Gender:** Female
- **Measurements:** Height: 155cm, Bust-Waist-Hips: 95-57-80cm, H cup
- **Hair:** Pink, Ahoge, Twin Tails, Waist Length+, Sidehair
- **Clothes:** School Uniform, Apron, Pajamas, Miniskirt, Thigh-high Stockings
- **Eyes:** Blue
- **Role:** Cousin, Non-blood-related Sister, Younger Sister
- **Subject of:** Pregnancy
- **Items:** Stuffed Toy
- **Engages in:** Lactation, Wedding
- **Body:** Big Breasts
- **Voiced by:** Nene

### Torino Gorou (鳥野 五郎)
- **Gender:** Male
- **Hair:** Brown, Blue
- **Clothes:** Glasses
- **Role:** Friend

## Shops
- [Official Website](http://www.flap-game.com/products/dl_sister/dl_sister.htm)
- [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ031351.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=512265)

## Releases
### Japanese
- **2006-09-22**: Love Love Boin Imouto no Kyonyuu - Package Edition - [Official website](http://www.flap-game.com/products/dl_sister/dl_sister.htm), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=7964)
- **2007-05-03**: Love Love Boin Imouto no Kyonyuu - Download Edition - [Official website](http://www.flap-game.com/products/dl_sister/dl_sister.htm), [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ031351.html), [Gyutto](https://gyutto.com/i/item2555), [DMM](https://www.dmm.co.jp/digital/pcgame/-/detail/=/cid=firstr_0001/)
- **2008-03-14**: Love Love Boin Complete Pack - [Official website](http://www.flap-game.com/products/lvbocom/lvbocom.shtml), [Getchu](http://www.getchu.com/soft.phtml?id=512265)

## Tags
ADV, Male Protagonist, Only a Single Heroine, Protagonist with Glasses, Student Protagonist, Defloration, Twin Tail Heroine, Missionary Position, Lactation During Sex, Heroine with Sport Bloomers, Heroine with Chinese Dress, Doggy Style, Cowgirl, Only Protagonist's Sisters as Heroine(s), Only Younger Heroines, Heroine with Big Breasts, Only Virgin Heroines, Non-blood-related Brother/Sister Incest, Bathroom Sex, Marriage Ending, Quickie Fix Position, Adult Breast Sucking, Sex at School, Single Boobjob, Protagonist's Non-blood-related Sister as a Heroine, Single Blowjob, Pregnancy, Protagonist's Younger Sister as a Heroine, Pregnancy Ending, Protagonist's Cousin as a Heroine, Cousin Incest

## More Games from flap
- [Love Love Boin Imouto no Kyonyuu](https://pinovel.net/v4336)
- [Love Love Boin Takabisha no Kyonyuu](https://pinovel.net/v4337)
- [Love Love Boin Hoken'i no Kyonyuu](https://pinovel.net/v4338)
- [Love Love Boin Elsis](https://pinovel.net/v11937)
- [Zettai Princess no Oneman Butler](https://pinovel.net/v1247)
- [Oyako Ninjutsu Kunoichi PonPon!!](https://pinovel.net/v4374)
- [Henshin Kanojo ~Haruka ga ○○ ni Kigaetara~](https://pinovel.net/v2786)
- [Uruwashi no Kimi ~Anata no Naka ni Sasagu~](https://pinovel.net/v6724)
- [Kainin Taisen Tsundere PonPon!!](https://pinovel.net/v2408)
- [Kamitama](https://pinovel.net/v2566)
- [Rain Memory -Amayadori-](https://pinovel.net/v3324)
- [Kaminarikko Chuuihou! ~Asu no Yohou wa Yome nochi Harami!?~](https://pinovel.net/v4229)
- [Links! ~Kimi to Seirei to Tsukaima to~](https://pinovel.net/v4879)
- [Yuurei to Koi Shitai!](https://pinovel.net/v5765)
- [Uruwashi no Kimi ~Mune Odoru wa Ore no Tame ni~](https://pinovel.net/v6759)

---
*View the full details at [pinovel.net/v4336](https://pinovel.net/v4336).*

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```