There have been times that my S/O Gave me oral and wanted nothing in return. When questioned she answered I get pleasure from making you cum and being happy.
I feel the same way when I do her. There is much more to it. Some times it is better than other but if you are always considerate of your partners needs and wants,it will come back to you in kind.
Try to experiment and a little coaching helps too. Practice and practice and learn each time you have sex. Tell each other what feels good.