Malec

Malec is a canon ship between Alec Lightwood and Magnus Bane in The Mortal Instruments book series.

Canon
Magnus first met Alec in City of Bones when the latter was delirious with poison. Magnus used remedies and magic to save him, and in the next book they started dating. Magnus helped Alec get over his fear of being gay, and helped him get over his crush on Jace Herondale. Magnus and Alec dated happily until City of Lost Souls in which Camille Belcourt broke them up.

On a brighter note, the sixth book (City of Heavenly Fire), is not out yet, and they will hopefully get back together.

Trivia

 * If you do not ship Malec, the fandom will shun you.  It is a manditory ship.
 * Another name for this ship is Freewheeling Bisexual Warlock (Magnus) and Princess Shadowhunter (Alec)