We don't see our relationship as a "power" thing. I feel like that's the root of a lot of problems, is thinking you need power. If you are happy let it be.
However, my boyfriend has some spurts of cockiness in the relationship. For example, he has recently decided that "the council" aka his penis and testicles will cut me off for the day if I get an attitude with him. WHATEVER! He's kidding of course, but it gets me irritated in a way that kinda entertains him.
When he starts to act cocky and compliment himself a lot, I know it's my hint to give him a little extra love because sometimes he just needs to be reminded that I couldn't find anyone better for me. I don't mind telling him because I truly believe it. In other relationships I might have completely avoided this type of thing because I will not tell a guy what he wants to hear for no reason. He has to earn my love too.