---
title: "Boku wa Onee-sama no Cosplay Doll"
description: "Protagonist Akira was a serious student, while his elder sister Yuuri put her otaku cosplay above all else.  One day Yuuri discovered something she could use ag"
image: "https://t.vndb.org/cv/04/23404.jpg"
---

# Boku wa Onee-sama no Cosplay Doll

![Boku wa Onee-sama no Cosplay Doll](https://t.vndb.org/cv/04/23404.jpg)

**Alternative Title:** ボクはお姉様のコスプレドール

**Aliases:** BokuKosu, ボクコス

**Developer:** Otoko no Ko Soft

**Release date:** Aug 8, 2012

**Platform:** Windows

**Language:** Japanese, English

**Rating:** 6.1/10 (15 votes)

## Description
Protagonist Akira was a serious student, while his elder sister Yuuri put her otaku cosplay above all else. 
One day Yuuri discovered something she could use against Akira, and it was his undoing. She coerced him into dressing up in one of her old outfits and took photos of him having sex. 
From that day on she had complete power over him, and dressed him in all sorts of erotic outfits... 
Their sweetly perverse days had begun. 

[from [DLsite English](http://www.dlsite.com/ecchi-eng/work/=/product_id/RE098187.html)]

## Characters
### Shou (祥)
- **Gender:** Male
- **Measurements:** Height: 155cm, Weight: 43kg
- **Hair:** Blond, Ahoge
- **Engages in:** Cross-dressing, Cosplay
- **Body:** Trap, Large Penis
- **Eyes:** Blue
- **Clothes:** Glasses, Maid's Dress, Wedding Dress, Witch Hat, Nekomimi Headband
- **Role:** Younger Brother
- **Subject of:** Feminization
- **Personality:** Opposite Gender Voiced
- **Voiced by:** Kanzaki Katsuki

### Yuuri (悠里)
- **Gender:** Female
- **Measurements:** Height: 170cm, Weight: 52kg
- **Hair:** Pink, Ahoge
- **Eyes:** Blue
- **Clothes:** Maid's Dress, Wedding Dress
- **Engages in:** Cosplay
- **Role:** Older Sister, Sexual Dominant
- **Voiced by:** Satou Milk

### Mako (マコ)
- **Gender:** Female
- **Traits:** 
- **Voiced by:** Ikuta Kaoru

### Mitsuru (ミツル)
- **Gender:** Male
- **Personality:** Opposite Gender Voiced
- **Voiced by:** Nanaumi Koneko

### Mylene Ensign (ミレー ヌ 少尉)
- **Gender:** Female
- **Traits:** 
- **Voiced by:** Yuuran

## Shops
- [Official Website](http://otokonoko-soft.skr.jp/hp_bokukosu_01top.html)
- [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ100127.html)

## Releases
### Japanese
- **2012-06-26**: Boku wa Onee-sama no Cosplay Doll - Trial Edition - [Official website](http://otokonoko-soft.skr.jp/hp_bokukosu_01top.html)
- **2012-08-08**: Boku wa Onee-sama no Cosplay Doll - Download Edition - [Official website](http://otokonoko-soft.skr.jp/hp_bokukosu_01top.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=15506), [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ100127.html), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0070484/), [DMM](https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_050526)
- **2012-08-11**: Boku wa Onee-sama no Cosplay Doll - Package Edition - [Official website](http://otokonoko-soft.skr.jp/hp_bokukosu_01top.html)

### English
- **2025-05-07**: I'm my Sister's Cosplay Doll

## Tags
ADV, Bondage, Group Sex of One Male and Several Females, Protagonist with Glasses, Group Sex of Multiple Females and Males, Female Domination, Vibrators, Protagonist with a Face, Anal Penetration, Footjob, Sixty-nine, Handjob, Cross-dressing, Pegging, Doggy Style, Armpit Sex, Anal Toys, Cowgirl, Changeable Clothes, Feminization, Trap on Female, Sexual Cosplay, Protagonist's Older Sister as a Heroine, Blood-related Brother/Sister Incest, Protagonist's Full Sister as a Heroine, Trap Protagonist, Only Blood-related Heroines, Only Older Heroines, Only Protagonist's Sisters as Heroine(s)

## More Games from Otoko no Ko Soft
- [Berdache ~Boku to Watashi no Touhikou~](https://pinovel.net/v13221)
- [Otoko no Ko Paradise 2](https://pinovel.net/v14033)
- [Chijoku no Gyaku Kyouikujisshuu ~Josou Pet ni Otosareru Boku~](https://pinovel.net/v11606)
- [Josou Gensoujou ~The Transworld of Beauty and Fetish~](https://pinovel.net/v14384)
- [Otoko no Ko Shoufu no Yakata Blue Eden](https://pinovel.net/v13512)
- [Otoko no Ko Paradise 3](https://pinovel.net/v13220)
- [Shota Choukyou Monogatari ~Kairaku no Toriko to Natte Aheahe Yogaru Shota Bishounen o Josou Sasete Okashite Hakudaku Eki Bukkakete Ore no Mono ni Shichau Natsuyasumi~](https://pinovel.net/v13214)
- [Itoko no Ko ~Tsundere Otoko no Ko Nacchan to no, Dokidoki Isourou Days!~](https://pinovel.net/v9266)
- [Aozora wa Sugu Soba ni, Kotoba wa Mou Kataranai](https://pinovel.net/v13511)
- [Imouto no Peniban de "Higii!" tte Sarechau Otoko no Ko](https://pinovel.net/v8068)
- [Otoko no Ko Rape ~Choukyou Semen de Ahe-ahe Before⇒After~](https://pinovel.net/v8584)
- [Eclesia ~Josou Shuuyoujo ni Okeru Kairaku to Daraku~](https://pinovel.net/v8732)
- [Otoko no Ko Rankou Club](https://pinovel.net/v11780)
- [Boku wa Onee-sama no Cosplay Doll](https://pinovel.net/v10964)
- [Otoko no Ko Paradise 4 ~Love Love Chu Chu ♪ Takusan no Otoko no Ko-tachi to Anal Sex Shitari Fellatio Sasetari Onee-sama mo Fukumete Iroiro Ecchi Shichau Omnibus ADV Game!~](https://pinovel.net/v13213)
- [Otoko no Ko Paradise 5 ~Eroero Ryoujoku Play♪ Takusan no Otoko no Ko-tachi o Choukyou Shitari Kairaku Zuke ni Shitari Chotto Maniac na Play mo Tanoshinjau Omnibus ADV Game!~](https://pinovel.net/v14032)
- [Netorare Otoko no Ko ~Ore no Osananajimi no Mujaki na Otoko no Ko ga Masaka Sobou na Taiiku Kyoushi ni Yowami o Nigirarete Choukyou Sarete Itsu no Ma ni ka Kairaku ni Oborete Aheahe Double Peace de Video Satsuei Sarete Yorokondeita Da Nante!!~](https://pinovel.net/v13566)
- [Otoko no Ko Gakuen! ~3nin no Otoko no Ko-tachi to no Unmei no Deai, Soshite Boku-tachi wa Koi ni Ochiru!~](https://pinovel.net/v13215)
- [Otoko no Ko☆Revolution ~Ketsu Manko Kyun Kyun☆Otoko no Ko Idol wa, Chinpo Love-Forever♪~](https://pinovel.net/v14385)
- [Otoko no Ko wa Joou-sama!! ~Onna no Ko mo Ossan mo Shota mo M Onna mo, Miinna Minna Okashite Nakadashi Shichau kara!!~](https://pinovel.net/v15040)
- [Shota Otoko no Ko Harem ~Ikenai Asobi ni Ochita Boku-tachi~](https://pinovel.net/v15041)
- [Rakuen e no Athanasia ~Otoko no Ko Maid to Sannin no Himegimi, Inbi Naru Kairaku to Tousaku no Sono~](https://pinovel.net/v18715)

---
*View the full details at [pinovel.net/v10964](https://pinovel.net/v10964).*

```json
{"@context":"https://schema.org","@type":"VideoGame","@id":"https://pinovel.net/v10964#game","name":"Boku wa Onee-sama no Cosplay Doll","description":"Protagonist Akira was a serious student, while his elder sister Yuuri put her otaku cosplay above all else.  One day Yuuri discovered something she could use ag","url":"https://pinovel.net/v10964","image":"https://t.vndb.org/cv/04/23404.jpg","author":{"@type":"Organization","name":"Otoko no Ko Soft"},"aggregateRating":{"@type":"AggregateRating","ratingValue":"6.1","bestRating":10,"worstRating":1,"ratingCount":15}}
```