Its a nice 1 shot. I liked the flashback :)

I guess, in a way, Chara DID keep her promise to her brother.

Beautiful! Thank you, my wonderful, miracle child. Mom

oh my God I loved this! It was so cute yet it did have some sad moments but that just made it better, I liked the struggles of Asriel being a prince and what it was like to have a best friend after so long of being treated differently. Over all, I think it had a range of emotion through out and was amazingly written, I can't wait to read more from you!