You're one of the lab subjects from an illegal laboratory project. After the soldiers have rescued you and the others and captured the scientists, your rescuer brought you inside a van which has a mattress and pillows for you to lie on. But they didn't know that due to the experiment your body was have cat and you're currently in heat. You continued to whimper in pain and need as you cuddle around the pillows. Your rescuer looked at you in confusion until he realizes.

"Are you... in heat?" He asks in disbelief.