A kiss is a lovely trick designed by nature to stop speech when words become superfluous.
I thought it was a relevant quote. Pip and Seras, there goes my heart.
Seras Victoria - Hellsing OVA VIII
Those are themselves the vampire Alucard. Blood is how souls are bought. A currency of life. It is just the intermediary to trade and sell a life. To suck blood is to take all of someone’s life for your own. You understand that now, Seras Victoria.