So for a vampire to be sired to another vampire, they have to have human feelings toward that vampire. If that is the case, why wasn't Damon or Stefan sired to Katherine? I mean granted she was dead but when she came back shouldn't they have been sired to her? It was proven that both Stefan and Damon were in love with Katherine regardless of compulsion or anything else. So it begets the question were they really in love with Katherine or something else?