 If you liked
My Imouto: Koakuma na A-Cup
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 ...then you might like
Tsun Tsun Maid wa Ero Ero desu
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The main character in "Tsun Tsun" actually has posters of "My Imouto" in his bedroom. They are produced by the same company, have very similar art styles, cater to certain fetishes (little sisters and maids) in similar ways, are both 2 episodes of only 15 minutes long each, and they are both about just one guy and one girl coming together and having sex several times.