This just came up in conversation last night. My sub tends to go a little crazy with her razor sharp fingernails when she's not restrained. Last night we were at her place where things stay a little more vanilla than they do at mine. Anyway, after our first "round" I put on my robe and went to the kitchen to make a drink. She walked in right behind me and asked if I was Ok. I said "Yeah...why?" she said "Because my pillow is covered with blood."
I went into the bathroom to look and damned if she didn't shred my back and ass! She said I should just think of it as a "grade for my performance".
Talking about it later I told her that one of the more erotic moments we had was when I sat up after a particularly enthusiastic encounter and realized that I had blood running down my chest to my stomach from two different wounds.
I don't know about "drinking" blood and never thought of our situation as vampiristic...but I do find the battle scars and a little blood a turn on!