What a fantastic and subtle parallel. And you could spin this in SO MANY DIRECTIONS.

Haruka allows Michiru to help her. Mamoru, repeatedly, feels the need to take on his burdens alone and not involve Usagi. He’s SO GOOD at the big moments. He knows that Usagi and her friends are the real power, he LOVES that about them. But when it comes to emotional things, personal things, he has to shoulder them all himself. A manner of compensation, perhaps? Like Usagi has to take care of so much that he can’t bear to burden her with things he feels he should be able to resolve alone? Which, you know .. don’t be a dumbass, Mamoru, you are not good at personal things on your own. You are DEMONSTRABLY POOR at personal things! But as a result, while Haruka will stand there unflinchingly while Michiru literally “kisses it and makes it better”, Mamoru is drowning in his darkness and can’t bear it.

I also very much enjoy this continuing with the subtextual level to this part of the story as I talked about last post. One of the very clear and unflinching things we’ve seen about Haruka and Michiru since their return is that they are enjoying a very healthy and robust sex life. They HAVE healed from the things they did or were willing to do to each other in the past — or at least they’re working on it. And so what we see between them is a deep, unshakable bond of partnership and trust.

Usagi and Mamoru meanwhile, this is where Usagi would like them to be, but a “kiss and make it better” isn’t enough any more. That glass shard is still lodged firm and deep, and they’ll need so much more to pull it out.

Giving a reader a sex scene that is only half right is like giving her half of a kitten. It is not half as cute as a whole kitten; it is a bloody, godawful mess.
—  How Not To Write A Novel by Howard Mittelmark and Sandra Newman