Our Sister's a Vampire!

Len is absolutely convinced that his older sister, Luka, is a vampire. With the help of his faithful twin, Rin, he sets out to prove that she is indeed a member of the living dead. However, there may be another surprise in store for them. A teeny bit of crack, and some brief Negitoro. This is a (pretty late) birthday present for One-x-Three as well.