You are friends with Ginny, but you never told her that you were actually a vampire (which only the teachers knew)

One night, when you were going to the forbidden forest to satisfy your bloodlust, you didn't realize that Ginny was following you because of how you had been acting strangely earlier

When you realized that she was following you it was too late, since she saw how you sucked the blood of an animal you had hunted

Ginny, seeing you do that and having been discovered by you, froze, looking at you in disbelief

• You... you're a vampire... you never... you never told me anything... - Ginny stuttered, her expression more disbelief than fear