 If you liked
Kiss x Sis (TV)
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 ...then you might like
Oniichan dakedo Ai sae Areba Kankeinai yo ne!
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Comedy and fanservice based around brother-sister incest.
OniAi takes a more harem-oriented approach while KissxSis focuses much more on the sisters.
Both are based on the premise of the sister(s) lusting after the brother, with the brother resisting with varying degrees of success. Both also feature an older girl (teacher, editor) who tries to correct what she sees as deviant behavior, also with varying degrees of success.
One guy a bunch of girls
Ecchi and Perv sister/sisters
girls jealous of eachother