User blog comment:MetalShadow272/When Wacky Worlds Collide Volume 3/@comment-4849943-20120713142725/@comment-17720060-20120713164526

Lightning changing himself (by wearing pants) caused him to hang out with a different crowd, causing him to separate from his true friends. In the past, Maim saw this, and put the pants in Kippy's lunch when Lightning wasn't around. Lightning got them back, and he started hanging out with another different crowd (Yacker and Reoi), but it hasn't grown to the point where Lightning fully changes, which it is hinted at in Issue 6. But Maim's planning something else now...

And I never made a story where Lightning first wore the pants and changed. All you know is that it happened somewhere behind the scenes.