These two are already among my favorite couples!!
There's a lot I like about this couple but maybe the 'thing' that makes them special is the reversibility...
I really like reversible yaoi couples... Well, I'm a girl, but I have a very dominant personality (& I don't really mean it in any kinky ways~), so maybe I'm just projecting my personal tastes, but this really is a great manga, I'd probably come back to re-read it sometime~
Takaramono wa Hako no Naka