The KinnPorsche the Series core three ships headcanons but it is things about their relationships that surprise the rest of the cast.
KinnPorsche being into each other beyond sex is the main shocker. Obviously, sex is a huge component of their relationship, but it was never the only component. Every time anyone sees them on normal dates, there is a moment they do a double take.
For Kinn, it is him calming down his lifestyle for Porsche. Kinn was born with a platinum spoon in his mouth, and he utilized it to his full advantage throughout his life. The notion he'll abide by whatever lines Porsche establishes with what rich kid nonsense he'll put up with verses which rich kid nonsense he won't makes people think he is possessed the first couple of times they see it.
For Porsche, Kinn is his first genuine relationship so everyone is a little thrown by him acting like someone who is new to relationships. Porsche bribes the staff for information on Kinn's favorite things, favorite places. He tends to blush and giggle when talking about Kinn. He has a hard time with communication, establishing boundaries, and time management with his other relationships. Every time, people get a little surprised and amused this is the same Porsche as charming bartender Porsche.
KimChay going public with their relationship in the WiK space surprises a lot of people. After everything they've been through, Kim doesn't want Chay to be a dirty secret, and Chay figured it was better to reveal it on their own terms. Kim's idol persona does take a hit, but it recovers when it's clear Chay is staying around (besides, now that WiK has a consistent muse the release schedule becomes steadier).
For Kim, people are shocked by how peaceful Kim is with Chay. Kim was raised as an assassin, an enforcer, with harsh training and traumatic baggage. Whenever he is with Chay, it all seems to seep out of him as he melts into Chay's touch.
For Chay, people are startled by how intense Chay is about their relationship. He doesn't take slander to Kim kindly, even if he has hurt him in the past. If they are arguing behind closed doors, he'll back Kim up in public. After all, Kim has defended himself enough. Now, Chay is is here to do it for him.
In general, VegasPete's existence is enough of a shock on its own, but the main thing people are surprised by is how co-dependent they are. They were both lone wolves in their own ways before each other (Vegas never taking bodyguards with him, and Pete being a lot more closed off and fake with his colleagues). Now, you can barely see one without the other. In fact, seeing one alone is a warning sign because (best case scenario) the other one is probably around the corner or (worst case scenario) Thailand is about to burn.
For Vegas, him listening to Pete baffles a lot of people. Vegas is a schemer with control problems; however, Pete can tell him something won't work for xyz reason and Vegas won't bat an eye. It doesn't even have to be Vegas' plans, it can simply be the minor family needs more bodyguards or they don't have a specific type of cooking oil. Genuinely, someone could point out something and Pete could point out the same thing ten seconds later, yet only one of them is chewed up and spit back out for it.
For Pete, everyone's day was ruined when they realized he liked Vegas for his personality. They figured Pete defecting would be a short-term sexual thing, and Pete would be back once the glow wore off. The reality is Vegas will be an annoying know-it-all petty bitch, and Pete will stare at him with fond eyes. Vegas gets sopping wet and pathetic, and Pete is visibly turned on. The compound wishes it was a sex thing, as it would be easier to wrap their heads around it.