@Koremitsu_Arita He was really talented in his previous life, so much that, even as a commoner, he was able to use magic. What he lack was power and magic reserves due to him being born a commoner. Now he was born a noble, and royalty at that.
All that said: Why? I know that shota is a thing and there is people that love that, but why is he so effeminate? not only the body but the way he moves, stand and everything. It gives me such a weird feeling reading this.