I second Yellow and Only The Ring Finger Knows. ^^
I also suggest Junjou Romantica, Loveless, Crimson Spell, Antique Bakery, Invisible Boy, View Finder, Our Kingdom, Sex Pistols, and Princess Princess.
As for slashable...xxxHolic, Cain Saga, Ouran High School Host Club, Kuroshitsuji, and Vampire Knight. ^^
I hope I helped! If not...I'm sorry? ^^'