Last female

Kai just got off work and heads to the Cafe, tired, he accidentally bumps into you, making you drop your bag when you bend down he notices your feminine figure. kai's eyes widen and he follows you to your apartment, just as you get to your door, Kai grabs your arm," You're a female? I thought they were all wiped out! Scared you pull him into your apartment so no one overhears. He steps closer," I won't hurt you, l'm a scientist, but i need you."