This is the summary from PapaKiki PSP game of Takanashi Sora route. Be warned for spoiler, and this is only a fan summary as I'm not really fluent in both Japanese and English, pardon for some mistakes here and there.
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At the Parent Day on Hina's kindergarten, Yuuta was called 'papa' by Hina, Miu, and Sora since he become the parent for Hina.But shortly after that Sora called him 'onii-chan' back, because she needs Yuuta to be Yuuta, not her papa.
Days later, aunt Yoshiko came to their apartment and acknowledged Yuuta worth to be the girls guardian and now they can live together. Sora then plans to make dinner for Yuuta, using Yuri's pumpkin soup recipe. But she has hard time preparing it so Miu whom overheard her plan calls Nimura and Raika to help her; and Miu said to Sora she also has surprise for Sora that she won't reveal yet. So as Sora's preparing the dinner with Raika and Nimura, Miu and Hina make Yuuta busy outside so he won't come inside.
When Yuuta comes back, Miu said she will stay over at Raika's house with Hina. Her surprise for Sora is to let Sora and Yuuta have time together. Sora then prepares the food for Yuuta after she embarrassed she's alone with Yuuta. When Yuuta tasted her cooking, he said that it reminds him of Yuri's, making Sora happy. After taking a bath (of course separately xP), they decide to sleep, with the usual using curtain as the partition.
Both of them can't sleep because they've used to sleep while being cramped, and since Miu and Hina are not there it feels different. Sora then asks if it's okay to move to Yuuta's side.

