Peaked at pegging?

This is a 2 Part question. Part 1- 41M My boyfreind and I '41 F' together for 3 years are are very sexually adventurous for 3 years now. A while back we gave pegging a try. It felt like the sexual peak has been reached. We have experienced everything. Only down hill from here. Any suggestions on how to get the feeling of adventurous feeling back? Part 2- Since being pegged Everytime in bed that is all he wants. I don't mind it but doesn't exactly get me off. Is there anything I should say or do? Should I be concerned? Will he feel something lacking if I don't peg him Everytime? And how to get him to desire me again and not just me getting him off? Has pegging taken away And how to get back his manly dominance over me I so very much enjoyed? Any words of wisdom?