Sex Pistols
This manga is messed up, in a good way, of course.
Kuroneko Kareshi no Asobikata
We have the classic come together - the supernatural "neko" shapeshifters with delicious smut of handsome men. The typical possessive lover thrown in the mix too.
Otona Keikenchi
This manga holds a special place, not for its idea of a possessive lover or the theme "school life", for that matter - it tackles the concept of the non-stereotypical couples. We have a shorter seme and a much taller uke. We see this in the real life too, even among heterosexual couples, and the mangaka did such a nice job of proving such a couple can work, contrary to popular opinion. Reminiscent to LoveCom, a shoujo manga, it is nice to see a yaoi mangaka having the mismatched couple as the protagonists of the series.
Saezuru Tori wa Habatakanai
Another one of those yaoi manga aimed for people with mature tastes. We have masochism, impotency, mafia...its dark and its a lovely read.
Under Grand Hotel
One of my all-time favorites, among the Viewfinder series and Sex Pistols. Twisted, smexy - both the top and bottom have abs, and an interracial (bisexual) couple.
Finder