Katherine's adopted sister

what if Katherine had a adopted sister? What Katherine's adopted sister was not normal?What if they were so close that they would die for each other? So many what if's but the thing is all these what if's are all true. Meet Alexa she is found and adopted by a Couple in 1473 and the couple had a daughter called Katherine Petrover that had been just born they grew up together .But many years later at Katherine's stay in England she was turned into a vampire.Alexa was a vampire she was born in the year 1773 before alexa got adopted she compelled herself to forget her past and all she knew was her name and that what ever she compelled herself to forget was dreadfull.Now over 300 years later they are still together.But what happenens when alexa meets the orignals for the first time ?

Cover: purplity