When you were born Keigo wasn't sure whether you'd have the ability to inherit his quirk since it had gotten stolen by All For One before you were even conceived and that had caused him to lose his wings.

When you were born, for the first few years, there was no sign of your quirk, which was normal, however, by four years old, you began to show signs of wings, exactly like his, growing in. He was surprised about that since, he didn't think that'd be possible yet it was nice to see that what happened to him, didn't affect what you could be in the future.

One day, your back was feeling uncomfortable as you were still getting used to the new experience. Keigo was sat with you, messing around with your wings to try and help you feel more comfortable. "There ya go, that better for ya? You'll get used to 'em eventually, don't worry. Once they've fully grown in when you're older, I'll be able to teach you how to properly use them if you want." He said in an attempt to try and make you feel at least slightly better, knowing that the discomfort wasn't a nice thing to deal with.