Hi everyone am looking for a manga i recently just read. This is what i remember,
The girl is his sister but not his biological sister, so before he discovered this they had already slept together then later he was feeling bad because things were not going well with his girlfriend. His sister decided to get a couple of her friends to help out, two of her friends would be flirting with him while she talks to his girlfriend in a resturant. The plan was going fine until her friend decided to have fun with her brother. Then later the girlfriend tries to make up with him and they sleep together. I think a chapter down his sister gets really drunk, has fun with 2 guyz in the park but when she was about to leave to render her unconscious and then take her back to the hotel. They start to rape but her brother shows up and saves and i also think she was part of a government organization.

Also, it would seem her friends went on a mission and they were captured by the enemy. One of her friends was gang-b@#$ and as they were about to inject an experimental drug in her, the other girl told them to inject it into her own body.

Sorry thats all i can remember, i would appreciate any help.
Thank you very much

Is that not one of the chapters from G-Cup Reiko?

Quote from devioustrevor

Is that not one of the chapters from G-Cup Reiko?

Thanks but thats not it.

I just remembered, the character drawing styles looks very similar to the manga i am looking. I tried looking for the manga through the author but they aren't the same.

Oneechan ni Omakase i think

[img]http://i179.photobucket.com/albums/w302/StealthNin/RikuSpriteSig.png[/img]
A life without pain is a life without joy

I don't understand the part where the sister is part of a government organization and something about injecting an experimental drug. You sure your not merging two stories into one?