Basic premise of the plot; a brother and sister are left alone for a summer by their parents.
They make a bet, loser has to do all the chores for the entire summer, that kind.
The sister loses, and becomes her brother's maid.
Then, the awesomeness kicks in and we have wincest.

Base +4, Azul7 +7

105 ev png

(18禁ゲームCG) [100813] [ローズティアラ] お姉ちゃんメイドのご奉仕タイム～秘密なんだからね！～

http://pink.komica.org/index2.htm 酸民沒貢獻,只會出一張嘴

Base +6, kakuka6666 -20

http://www.dlsite.com/pro/work/=/product_id/VJ004900.html

Base +51