In the End of the World, My Sister Becomes a Vampire Boss?

"Brother, can I bite you?" "Just a small sip." Su Ze traveled through the apocalypse and had a sickly loli sister. Looking at his sister's longing eyes, Su Ze shuddered. Because his sister is a vampire! At the critical moment, a mysterious selection box appeared in front of Su Ze's eyes. A. Reject the sister, kill the sister to prove the truth, and reward the blood of the ancestor of the blood race x1. B. Promise to my sister and become the last vampire. I will be rewarded with +1 basic attributes and gain the protection of the ancestor Lilith. "Is there still a choice?" Looking at the selection box in front of him, Su Ze chose b without hesitation... Ps: Newbie, new book, the introduction is weak, please read the text! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.