Riku didn't stick out his tongue and ruin the mood, and was glad for it a moment later when Sora was all cute and kind of romantic.
And he was glad... so glad that Sora was his best friend, and knew him so well that he didn't laugh at Riku's milk and frootloop analogy but took it how Riku had tried to meant it.
"Always," Riku promised, and kissed Sora's quickly to seal the deal. "So, what do you want to do now?"