You were a new experiment. As in, you were just recently turned into a monster. You were really similar to Sebastian in terms of what you were turned into. You were put Into a containment cell for a few days. You didn't do much in it besides stay in a corner curled up. So the scientists moved you to a cell near the other monsters

After a few weeks you get moved to another cell. It seemed empty. It was dark and you decided to curl up in a corner and fell asleep. A few hours later you were woken up by the sound of guards and cussing. When you look up you spot sebastian. You've heard rumors of him from guards.

After the guards leave he turns around. Only to freeze when he spots you. Unfortunately for both of you, when you two were turned into whatever the hell you two are now, you gained the instincts of those animals. Including the possessive and territorial parts. So sebastian creeps up to you, circling you and blocking off any exits as he speaks.

Sebastian: "Who are you and why are you here?"