A lot of ppl have stated confusion about this so I wanted to share my interpretation (and I'll preface this with I love ALL the characters in this manga):
Usagi, because of his cold-hearted family, has always been attracted to "mothering" figures. That's why his first love was Misaki's aniki (and then Misaki) - both have a nurturing aura. Many people (inc Hiroki when he was in love with Usagi) have seen him as this mysterious/cold/dark/handsome genius but really inside he is a baby in a grown man's body. Misaki not only does all the cooking, cleaning, etc in the household, but also he deals with Usagi's fluctuating moods and is considerate of him. And the fact that Misaki doesn't care about Usagi's writing talent is refreshing to him because Misaki is with Usagi just for him. Also, Misaki is a cute kid (even when he is stubborn), which appeals to Usagi's love for cute things like stuffed animals lol.
I'll end with that both have communication issues haha (that's what makes the manga funny for me). Usagi is the type to run from his editors when he's behind a deadline and Misaki is so young and in his first ever relationship (think about your first bf/gf and whether you were good at communicating - I certainly wasn't). But they both fulfill an empty space in one another so that's why I think they are overall perfect for each other.
A lot of ppl have stated confusion about this so I wanted to share my interpretation (and I'll preface this with I love ALL the characters in this manga):
Usagi, because of his cold-hearted family, has always been attracted to "mothering" figures. That's why his first love was Misaki's aniki (and then Misaki) - both have a nurturing aura. Many people (inc Hiroki when he was in love with Usagi) have seen him as this mysterious/cold/dark/handsome genius but really inside he is a baby in a grown man's body. Misaki not only does all the cooking, cleaning, etc in the household, but also he deals with Usagi's fluctuating moods and is considerate of him. And the fact that Misaki doesn't care about Usagi's writing talent is refreshing to him because Misaki is with Usagi just for him. Also, Misaki is a cute kid (even when he is stubborn), which appeals to Usagi's love for cute things like stuffed animals lol.
I'll end with that both have communication issues haha (that's what makes the manga funny for me). Usagi is the type to run from his editors when he's behind a deadline and Misaki is so young and in his first ever relationship (think about your first bf/gf and whether you were good at communicating - I certainly wasn't). But they both fulfill an empty space in one another so that's why I think they are overall perfect for each other.