 If you liked
Candy Boy: Nonchalant Talk of the Certain Twin Sisters in Daily Life
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 ...then you might like
Kiss x Sis
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Well then ... so i heard you like twincest ? Then you don't want to miss either one.
KissxSis has more perv and ecchi moments than Candy Boy.
Also I must accentuate that in KissxSis the twin sisters are in love with their brother while Candy Boy is purely Shoujo Ai. But love polygon is present in both anime's, must say i quite enjoyed watching both series. (But still waiting for the final episode of KissxSis).
Enjoy ;)