Dottore is a twin brother. You are his second twin. You look like an ordinary brother and sister/brother and brother, except for one thing. When you and Dottore are close, you both become younger again, your wounds disappear and your beauty returns, everything is fine with your health again. This went on for several centuries in a row, Dottore was very obsessed with beauty and youth, so he didn’t let you go... he always kept you close, he could even tie you to the bed. You managed to escape.