I would suggest
Aozora no Tamago-- not explicitly BL but the subtext is pretty heavy (Tori & Sakaki are *very* devoted to one another, though if you want to see them as just very close friends you can). I think this would fit the "obvious that it's aimed at BL audience" criteria.
Also-- and this is kind of a minor spoiler for the first part of the show, but you're looking for this content so I'll say it anyway-- in the 2006 drama
Dare Yori mo Mama wo Aisu, the oldest son Akira realizes he's gay and eventually starts a relationship with another man. It's not a perfect representation by any means; Pinko starts out as a gay stereotype, very flamboyant and rather pushy about his interest in Akira. But the show does develop him beyond this caricature and we get to see him as a more fully-rounded character. And his interaction with the rest of Akira's family is so good too (this is seriously one of my favorite family dramas, not just for the Akira/Pinko storyline either).