 If you liked
Kiss x Sis (TV)
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 ...then you might like
Oneechan ga Kita
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both are about a step-sister and brother relationship (the sister who has an abnormal obsession about her brother), but Onee-chan ga Kita it's only about 3 minutes.
Kiss x Sis is literally the exact anime but with twin older sisters. It is arguably better in regards to the characters. It has better art, better animation, and 20+ minute episodes. Kiss x Sis, however is ecchi, and if you watch the series of OVAs it is borderline hentai.