Miss is making caramel sauce for pudding, but Reimu can't wait and demand Miss to give it quick. She even starts crying and bumping to Miss' leg (the stove is still on BTW).
Finally after the caramel sauce is finished, Miss give Reimu a taste. The caramel sauce's temperature is 180 degree fresh from the fire.
After the sauce cools down, Miss and Reimu eat the pudding together. Reimu is feeling happyness, Miss know it's useless to tell her anything right now. That caramel sauce is about to get burnt if the temperature goes higher.