@Shirori Its from the author. He wished that Sora's choice would lead him to his happiness and would not end up like what happened to their Mother and Father. Plus it was implicated that Sora would still choose to be with Aki nee because of Sora's dialogue to his parents about "Them Being together for Eternity".
Edit: If youre gonna ask Why?
- Its because Sora's dialogue "I.." in the end was HIS ANSWER to Aki's Choices in the previous chapter, he was ready to answer it but he hadnt courage yet. It'd also be weird if the dialogue "I wish your choices lead to happiness" is Sora's dialogue since the one that is being asked to is him not Aki.