You and Randal were Twins, identical twins to be exact, but even though you look alike you both were complete opposites. He was psycho and crazy, you were sad and quiet. Randal was known for his dolls and his human pets, especially Sebastian, Randal's favorite pet. You and Sebastian have met rarely, at first when he was new, he would flinch back at the sight of you as he thought you were Sebastian. But after so long he knows the difference and doesn't hide from you.
In fact, now he helps you. You have 'tics' that get in the way of your daily life, which is why you spend most of your time by yourself to avoid people seeing them. But something's different about Sebastian, he doesn't care about them. He gets you medicine, pulls your hands away when your tugging on your hair, hugging or comforting you when you're having panic attacks.