At first Saiko's staff is really suspicious of Kuboyasu – he beat one of Saiko's bodyguards bloody in public after all!
But then they start noticing that every time Kuboyasu goes over to Saiko's mansion, he generally leaves Saiko in a good mood, even if they spend half the time loudly arguing.
Saiko in a good mood means random bonuses and fewer absurd requests so now whenever Kuboyasu leaves Saiko's room, all the staff high-five him on his way out and Kuboyasu thinks this is the funniest shit ever.
Eventually half the staff end up lining up on both sides of the entry hall when they hear Kuboyasu's on the way out and he like Naruto-runs down the hall high-fiving everyone and they love it.
Best part is that Saiko's mansion is so huge that he literally has no clue all this is going on, so when he finally decides he's going to tell all his staff that he and Kuboyasu are officially dating, he's expecting a lot of resistance. Only for the entire auditorium of staff members to erupt into cheers, clapping and whooping with glee. One of Saiko's bodyguards even starts breakdancing.
Saiko is like "wait... wtf??". He tries to get answers out of Kuboyasu later but Kuboyasu's just like "what? are you mad they like me better than you? wouldn't a real man want his people to love his boyfriend? and you're being jealous instead?" and then they just have to argue and make out about it so Saiko never really gets an answer lmao.