User blog comment:Zergrinch/All about Shipping/@comment-4955384-20121029011640/@comment-4928331-20121029012729

Arguments for chalant in the show Arguments for chalant in the comics
 * 1) The kiss on Auld Acquaintance
 * 2) "We have a history" - Depths
 * 1) The kiss on Robin's birthday, year zero
 * 2) The birthday kiss on Nightwing's birthday, year five