Simply put: the best ship known to mankind. It's so perfect, that it makes you want to vomit rays of light because its beauty makes you sick. The way Sora always has to save Kairi is such a clever subplot because Sora's willingness to kill himself in order to save Kairi in Kingdom Hearts I and III shows us the definition of love and a perfect relationship. I mean, yea, Kairi is never interacting with Sora because she's always being pushed aside or captured, but they are no doubt the most developed ship within the series. I mean, sheesh, is there any ship that's better? Most likely SoRiku (Sora x Riku), but that is a whole other topic of perfection.
Person 1: "Do you like SoKai?"
Person2: "No, but my sister does."
what you say when your offer has been declined
"sokay. s'no point in raising some kind of pressure you know."
"sokay. i am here in case you need company. i hope you know."