Bruce folded his superlong arms, the back of his head against the ceiling, and stared down at his infant brother, who'd been twelve only a few minutes before. Would his wish work?
Andrew's body seemed to shudder. Bruce quickly knealt down next to him, cradling his tiny head in his huge hand, but even as he did so Andrew's eyes flew open and the baby let out a long piercing wail. Andrew suddenly started to grow as he continued to scream, advancing rapidly through years of growth. His scream broadened and deeped as Bruce watched him advance into pubertly in shocked amazement. His pubescent body rippled with the changes on manhood, and he grew longer and broader in the shoulders, pubic hair erupting from around his descending cock and balls, lithe and then rapidly thickening muscles forming across his chest and arms as he continued to age. All this time he was still wailing in one long breath, his eyes staring into Bruce's, his morphing head still held in Bruce's hand.
Bruce watched wide-eyed, increasingly anxious, as Andrew shot past his old age of 12 and kept going. It suddenly occurred to Bruce that he might have made Andrew age too much, despite his poor showing and Agent Avenger! He muttered to himself, "Please, let him come out O.K."
Even as he spoke the words the growth seemed to slow down, and then seemed to stop abruptly. Andrew's scream fell away, and he was gazing deep into his brother's eyes, mouth agape. He glanced down at his naked body--the body of a model-handsome, 6'5", 23-year-old muscle hunk. Even the 10-inch cock from his first wish was back.
He looked back up at Bruce with a huge grin of joy and relief. "Thanks, bro!" He reached up with his long, firmly-packed arms to embrace his brother's lanky frame.
He pulled back, his arms still wrapped around Bruce's stretched torso. "Your new bod's kinda cool too!"