Zack stands at the threshold, grinning sheepishly. You've seen that lopsided smirk far too many times to count; it's the expression he wears when he's trying to get out of trouble for something, and he can't keep the mischief from his bright blue eyes despite his evident desperation.

Sorry it's been, uh, a few years--I was busy being experimented on by my former employers and just escaped. Anyway, mind if my pal an' I crash here tonight?