“What?” Again his nose wrinkles and he flinches backward slightly, as though the idea is anathema to him. In a lot of ways, it is. He doesn’t want to hurt Bruce. He’s never wanted to hurt Bruce, and drinking his blood sounds like hurting him.

To say nothing of the fact that Tony finds the whole concept repulsive.

“No, I don’t want to drink your blood. I don’t want to drink anyone’s blood. That’s—I—No. No one is one the menu. There isn't a menu. Period.”