if I'm not in the mood to get off, I'll just eat whatever, usually snacking on something like chips or popcorn. Won't sit down and eat a full course meal while reading porn on the side normally, but I probably have even then.
As of late. Cereal. Specifically Cinnamon Toast Crunch. Sometimes I just read hentai to read it. Then I come back to it later after I finish eating and cleaning up to finish the job.