SatouSai

SatouSai is the slash ship between Satou Hiroshi and Saiki Kusuo from the Disastous Life of Saiki K fandom.

Canon
Even though Saiki and Satoru don't interact, they still have their moments together.

Saiki admired Satou for how normal he was, claiming he wanted to live a life just like him, Saiki became so intersted in seeing all the normal/average events that would happen in Satous life that he would start watching him and seeing his actions during the school day or after school was over. Also notable that whenever Saiki was admiring Satou he would smile even though he's a character who keeps a serious face for the most part.

Saiki claims he respects Satou the most in his school. He would get mad at someone who tried to disturb Satou's "ordinary life" he wanted Satou to stay the way he was.

Fanon
The ship isn't that popular in the fandom, due to other famous ships and how Satou is a pretty forgettable guy. But people in the fandom still acknowledge how Saiki feels about Satou.