troublesome twins (au sans and papyrus x mischeif twin reader )

You and your twin Madison were very mischeif twins always getting in trouble, your dad is dead,your mum gave up on you and your big sister never cared for you, you both have magic,you can turn into a teenager or child and more, you rarely go in your teenage form for some reason, oh and it's when all the au's are all in the same underground and you can change you twins name to your sister's name if you have one.