Actually, there is a great answer for this. There was a multiverse book that was done a few years ago by Doug Moench and Kelly Jones where Batman was actually a vampire.
nothing.
If the venom from the vampire gets inside you, then you will transform into a vampire.
Yes You can only get bit by a vampire if you truly love him or her That is the only way to become immortal
They would just get a scar that would never go away
Human vampires being mythical AKA imaginary creatures, whatever happen is what you dream up will happen.
When Bella gets bit by James in Twilight, she isn't dying, all that is happening is James's vampire venom is getting into her bloodstream which is starting the painful process of a human to vampire transformation.
they would tear the skin but they would not kill it- see the example of Riley and Seth
Be afraid , be very afraid..
They dated a little bit in Batman returns.
He got bit, by a vampire.
One Vampire can bit you
Both Jason and Edward bit Bella.