Moon.....come on...
Of course they are in pain the Holy Spirit of God, burns them. Trust me on this one, they are in terrible pain, just like being put in boiling water.
One of the reason exorcisms works is they do not like it at all.
Plus, they are never happy, nothing give them pleasure, have you ever met someone who was always miserable? Same folks. Now I am talking from
experience here, not guessing.
Most of the real prayers for exorcism are about 75% healing and the rest is casting out.
I hate to disagree with your my very good friend, but this has not been my experience, that they like it.