Chapter 123: I Will Block You
Leaving aside the truthfulness of her transformation timing and cause, from this reply alone, it was evident that the vampire behind "Kasumi of August" placed great importance on establishing contact with Xiang Kun, a potential "vampire companion". Although she expressed dissatisfaction with Xiang Kun's "take it or leave it" attitude in their conversation, she still actively advanced the chat with continuous compromises.
Her question at the end of the response, "Who was your first meal?" revealed more information.
The word "who" obviously referred to people, indicating that the other party fed on human blood and assumed that Xiang Kun did as well.
Do vampires have to drink human blood? Based on Xiang Kun's experiences, the answer is clearly no.