Harry Potter and the Clay Twins

Orphan Twins Amelia and Elizabeth visits Platform 9 3/4 a popular tourist spot for Potter fans for pictures when strange magic causes them to de-age and join Harry to Hogwarts. How can they belong in the Wizarding world if they grew up in a muggle orphanage? What else is being hidden from them and why do they feel a sense of belonging next to Harry?

Not beta read. This story came to me in a dream so it may be jumbled at points, still working out the plot line and just trying as I go. Updates may be irregular due to work. Thank you