 If you liked
MeruPuri: Märchen☆Prince
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 ...then you might like
Yoru made Matenai.
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MeruPuri is a lot better compared to Yoru Mad Matenai, but they have similar concept of the younger [brother-like] boy falling in love with the supposed-older sister. it's somewhat taboo, but it isn't because neither of their relationships are actually blood-related. Meru Puri has magical themes embedded into the story, whereas Yoru Made Matenai is just a story about love and has some sexual scenes. however, i have to say that both of the male characters are super cute!