 If you liked
Kanojo no Imouto to Kiss wo Shita.
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 ...then you might like
Mamahaha no Tsurego ga Motokano datta
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You liked a sister in Light Novels, but you want something a bit different? Then I recommend you read these Light Novels.
The sister in these Light Novels is a step sibling, so there will be awkwardness in between them. Both male main characters of these Light Novels have girls who love him. Also, equipped with romance and comedy stuff whose you can make a grin self.
For the storyline, it's quite leisurely, so you can enjoy it in your free time.