Holly, welcome back. What you're describing is typical cat behavior. My cats will do the same thing. They'll start licking each others heads and it looks all cute and innocent and then one of them will bite the other one and then this turns into a boxing or wrestling match. They'll also put their ears back,airplane ears, and look very mad and irritated.

I wouldn't be too concerned unless you notice that one cat is hurting the other one. I'll sometimes break it up if I notice that one cat is hissing or growling and the other cat keeps on chasing them or acting too rough with them. Sometimes they get overstimulated so they don't know when to stop. I hope that this information helps.