De aged Captain Marvel except CM is now Billys age and Billy is... gone. What follows is CM trying so hard to NOT reveal that his crucial other half is maybe sorta removed from existence, and he looks suspiciously like a homeless kid the League ran into ages ago.
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When the evil wizard casted a de-aging spell, the rest of the Justice League were all prepared to babysit the rest of their team, each member planning how they would take care of a bunch of super powered and traumatized kids just in case they were (un)lucky enough to be the oldest. What they did not expect was for Captain Marvel to shield them all from the blast. When they finally regained their composure, a few members double-checking that they weren't a teen, or worse, a toddler, they were instead faced with a... tiny version of Captain Marvel. A little baby faced boy, barely 10, in Captain Marvels now very ill-fitting costume. The boy was just as confused as they were, but for very different reasons. He didn't seem at all bothered that he was missing multiple feet of height or a hundred pounds of muscle. Rather, he was holding his head, mumbling something about 'where are you, kid? kid? can you hear me?' He looks like he might cry and the League has no clue how to fix it. Due to the newfound issue of Magical Child Being, Captain gets quarantined until they can figure out a way to reverse the spell. This leaves Captain with plenty of time to grapple with the fact that he's alone and Billy is gone. Its lonely, its horrific, and the gods have no idea how to help and get their champion back. He's the personification of magic, of Billy's ideals and hopes and dreams, of the responsibility tied to magic, and without Billy, there isn't actually anything tying him to reality. When the spell eventually wears off and Billy is back, Captain immediately takes a long break from hero-ing. The League thinks it's because being a kid again was just too much for Captain, in reality Captain and Billy spend like a month bonding again and repairing the relationship and anxiety of not having one another to balance the other.
