Okay but how about Atsumu trying pet names with Kiyoomi and after they start dating and Kiyoomi just laughs his ass off, thinking he's joking and then when he realizes he's not... He cringes as fuck. Atsumu's dreams of "darlin'" crushed by Kiyoomi's anti-sweetness.

Meanwhile, Osamu and Suna's idea of romance is "bro" and "dude" anyways so Atsumu can't even project. Then one day Atsumu hears Kiyoomi call him the love of his life but not to his face and it fuels him for the next ten years. Even prompts him to propose in the following weeks.