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You'll probably love Chocotto Sister, most likely what you're looking for. Boy wishes for a sister and is granted his wish, with the story about the two living together as siblings happily.
Other good ones:
Papa no Iu Koto wo Kikinasai - the oldest sister sees the MC who is their guardian as her onii-chan. Really heartwarming story.
Canvas 2 - Nijiiro no Sketch - non-blood related w/ romance. great character development.
Boku to Kanojo no Renai Mokuroku - the little sister is one of the main heroines. The story is one of the more... unique ones I've read.
Onii-chan Control - Little sister is an extreme brocon. On the yandere level. And that's what makes it hilarious.
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