Nee x Nee! Docchi ga Suki? Docchi mo!! ~Yasashii Onee-chan to Cool na Onee-chan ni Hasamarete Boku wa Mou!!~

The protagonist’s two older sisters—one acting as a mother figure, the other as a father figure—raised him with both kindness and discipline. Thanks to their efforts, he grew up to be a good kid who cares deeply about his family. Though, perhaps they tried a little too hard… Because now, the protagonist has grown to like his sisters just a bit more than family. [Translated from dlsite]