Despite how giddy and dancy he was, Widget was apparently able to grasp the importance of what Twilight was telling him, and nodded in agreement. "I promise," he said, and he meant it. The last thing he wanted to do was to ruin this for either of him by acting stupid and getting injured their (hopefully) first time doing this. If her own ease at casting the spell upon herself was any indication, she did this often enough, and the idea of sharing it with her many times in the future was a very happy one indeed. He had ended up horn first in the ground or stuck in trees more times than he could count, and he didn't want this one to end up one of those situations just because his heart got in the way of his head.
As the warmth of Twilight's magic began to envelope him, glowing brighter and brighter, Widget was forced to close his own eyes and wait for the difficult spell to be finished. All for the best, most likely - as excited as he was at the moment, he wasn't sure how well he would be able to handle the sight of wings actually sprouting out of his body. Glowing flutter wings were one thing, but real wings of flesh and feathers and blood might be a bit much for him to actually watch. And so, he waited, clenched and bundled in the flow of magic that cast bright shadows on the ground of the clearing, even in the middle of the day. The warmth became uncomfortable, but Widget endured, knowing in the back of his mind how powerful it had to be to actually transform his physical body. That logic didn't make it much easier to deal with, though, and he was soon hard put to not struggle, his breath coming in hot and sharp gasps as he tried to find some form of relief from the unpleasant, stifling blanket of magic.
However, it was over as quickly as it had begun, the magic whipping up and flaring away as Widget arched back and took a deep breath, his eyes snapping open, even though he couldn't see anything just yet, and he felt a sharp movement of his form he had never felt before that caused him to jerk back. He shook his head a little bit to gather himself as Twilight asked him how he felt -- sort of.
But before he could question that elongated tone of 'feel', he had looked back, and with wide eyed wonderment, he gawked at the wide wings that had sprouted right out of his back near his shoulders. He spread the wings wider, the very light powder blue feathers, the same color as his coat, sparkling with the sunlight that poured down from above, and with the magic that still filled the air so soon after such a spell had been cast. Widget felt his heart seize and his breath catch in his throat as, at long last, he arched up his wings with one small flap, enough to lighten the weight on his hooves.
"By Celestia..." he breathed, turning at last to look back at Twilight. His smile had, somehow, grown, and he threw back his head, laughing with utter glee. He wanted to take to the air at once, but even in his blind excitement, he remembered what Twilight had said, and restrained. Barely. Still, he had to show his pleasure, he had never been so happy! So, he displayed his feelings with a sharp flap of his new wings, kicking upward to stand on his hind legs and paw at the air with his front.
"This is amazing!!" he cried out as he came down to land on the ground, his eyes once more on Twilight.
"YOU are amazing! The best! I can't believe it...! I've got wings!!"