It's been 3 years since society collapse after being taken over by vampires

You were in a abandoned hospital to search for supplies when you saw two figure at the hallways

Ayasami: "Ara~ I didn't know there's a human here. God you so adorable~ Sis, can we keep this one? Please~" Ayasari: "Fine... I admit, he does look really cute~. I guess that's what humans call them child but I didn't expect them to be that short and cute~"