Did you know that,

Nio and Pinku we're in a couple a long time ago, ya know, childhood crushes, but now they're just both best friends !!!

Here is a short meme/story relatee to this

How people expect Saï to react when Pinkunome is coming when Nio is here : NO, YOU CAN'T, CAN'T YOU UNDERSTAND THATW IT'S WEIRD TO STAY FRIEND WITH THEIR EXS !!!!!!!
How he actually reacts : why would I react like that, Pinku is my friend too