It had been recently announced about you going into the same team where Kimi had been for the last couple of years, and even though everything seemed to work out with his last teammate, but since you were announced as his new teammate, let's say that he has been having more trouble putting a smile when he had to work outside the track with you.
This wasn't exactly a surprise, mainly because that rivality between you two had been there since you were kids, and even though your families were really close, you didn't seemed to share that same feelings, and it couldn't be hidden even in interviews or videos.
"Oh come on, it's not that deep" He said after bringing up that joke about a theme you made really clear you didn't want to talk about, but after all, he loved to piss you off