I agree with Julian, Barnabas and Willie, um, I mean William H. Loomis, a homosexual couple, fixing up The Old House, sound exciting..but I just can't see this happening.
I think Barnabas did it out of angry and a little bit of shame on William H. Loomis. The angry, you know whats that means...Barnabas was mad at William H. Loomis, and the shame, I think he did that bite (on the neck) to show William H. Loomis,that he will do everything that he (Barnabas) wants or you will do "something" else, and you don't want to do this....right.
But.....it still sounds exciting.