He can't... but he can make you think he does. Humans don't really have direct contact with the outside world, everything goes through the brain first. If someone can somehow manipulate her brain to see, hear and feel things that don't exist, then the question of his having an erection doesn't exist. I mean he can probably bypass her senses and directly manipulate her brain. After all, that's what vampires do, don't they ?
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well his skin is stone hard anyway so he would not need to have an erection, so yah they could
