What do 你 think feeding on another vampire's blood means?

“Bloodsharing in vampire folklore — and certainly in the book mythology — is kind of sexual,” she explains. “It’s very intimate. It’s an exchange of bodily fluids, as they say, that 你 really shouldn’t be doing with anybody who’s not your one true vampire love. That’s the intention that we were going for there. In a weird way, Elena needing a fix was doing things that she shouldn’t have been doing to get help.” -Julie Plec

bloodsharing is a vampire mating activity it means that person really loves each other.