I believe it's because he was going to give her his pudding, but she already ate it, and in Japan, eating someone else's food without permission is very, very not cool.
Seconds, if you please!kufufu♪A name, yes...Kohaku...Kohaku...Shower your love upon us forever more♡Kohaku...Well then, tally-ho!
While we would also like to have some of your fluids...
We have a desire for more pudding!Right in the middle of the day, really...
...erm, let's see...
I left my pudding inside the fridge......my Dear!...what is it?To have granted us such a splendid name indeed! Noooooooooo!!!