I think this was my first omegaverse manga, too
It's subtle, but the love between Mii and Aoi is a little different than the love they have for their partners. I think it had more to do with being each others' comfort and helping each other grow. Their love for their partners is a mature kind of love, when they were both healed enough and strong enough to aim for what they desire.
Mii in particular, he was ready to take Aoi away, but he fought Yuu (head butler) over and over again before being okay with "ruining his life" (his words). The reality was that he was simply too afraid.
There are different kinds of love (like everything, it's a spectrum), and I am glad the author touched on it.
I'm glad that they each got to have their own happy endings in the end. although I admit, aoi and ichirou's bond left me with a bittersweet longing for an alternate ending—one where they ended up together, defying destiny despite the odds against them...
read this manga for the first time three years ago, and it hit me with so many beautiful emotions. picked it up again today, and honestly, it feels like I’m experiencing it for the first time all over again. crazy how some stories never lose their magic, no matter how much time passes. such is destiny.