Not just used to it, but is seems like she enjoys cooking...

I don't really understand what happens in the last panel.

Just let your mind wander into eternal bliss.

Let's see..
Nue's lying down and blushing..
Reimu's having a happy face and her hands are kinda suspicious..
Kasen is shocked and blushing seeing those two..

ThunderBird said:
Not just used to it, but is seems like she enjoys cooking...

I'm pretty sure that out of all the hardships of the day, at least being able to make your own delicious food should be enjoyable.