After I finishing reading a novel or watching a movie, I bathe in the afterglow and feel a bit of empty feeling. After I finish reading a novel or watching a movie, I bathe in the afterglow and feel a bit empty.

"feel empty" is more natural

This is probably because I want to see thea continuation of the story, and finishing the story is ameans parting with the characters. This is probably because I want to see a continuation of the story, and finishing the story means parting with the characters.

'the continuation' => a specific continuation or sequel that someone has made already

I am sometimes too empathetic toize too much with them. I sometimes empathize too much with them.