Astonishing X-Men #2. I absolutely love this cover of Emma Frost and Cyclops. Current theory has it that when Jean Great died again recently, Jean Grey is still somehow in Emma Frost's head. This is because that Cyclops and Emma are currently a thing in the comics and Jean Grey actually did a mind-transplant-thing like that around issue #281 of Uncanny. That goes way back but makes sense. Death to Jean Grey is like a revolving door in the Marvel Universe (paraphrasing Peter David there).