Albus stared down at the two small boys slumbering atop the enormous bed inside Sirius's room, trying to understand how something like this could even be remotely possible. Deaging was no simple process, after all, even for a wizard as learned as he. And while he had yet to learn the identity of each, Albus had already formed an educated assumption as to which toddler was which. It was more than blatantly clear to Albus who the well-nourished boy with clean, black hair was, just as it was abundantly plain to him who the runty boy with greasy black hair was.
"Would you be so kind as to explain to me what happened, Molly? Albus whispered, not wanting to rouse the toddlers from their deep slumber for fear it would do them more harm than good.
Albus nodded along patiently as he listened to Molly's explanation, unsurprised to hear that the deaging had come about as a result of the two men's endless bickering. Apparently Severus had arrived for the Order Meeting to find Sirius fiddling with some wooden box and had ordered the Gryffindor to destroy it. Having been unamused with Severus giving him commands, Sirius had yanked the lid from the box to spite him. Unfortunately, that act of childish rebellion had been the cause of a cloud of pure-white vapor escaping and encasing the two black-haired males. When the smoke had finally cleared, two passed out toddlers lay in their place.
"Thankfully nobody else was close enough to be affected." Molly concluded, looking thoroughly relieved that the power hadn't deaged everyone.
"Where is the box, Molly?" Albus questioned, frowning at the bruising on Severus's face.
"Arthur vanished it just as soon the smoke starting shooting out." Molly fretted. "We felt it was too dangerous to keep around."
"I see." Albus muttered, hoping that the deaging could still be reversed without having the source available to study. "Has Poppy been notified yet?"
"Minerva sent for her the same time we sent for you." Molly assured, hovering near the bedside. "They'll be alright, won't they?"
"Deaging, while rare, isn't known to be particularly harmful." Albus clarified, still highly concerned.
Deaging was no easy process to reverse, after all. Given the rarity and the complexity of the magic required to cause such a result, not many wizards had managed to successfully reverse the effects of such a mysterious and ancient magic. And given that the source of said magic had been completely vanished, Albus wasn't exactly hopeful that this particular case would be one of the few that were successfully resolved.