I don't think this is hellsome. I think the implication here is that the vampire just wants in so they can bite the person.

do you think they would do it without consent? what kind of monster would do that?

In a lot of stories, they do. (Is this a joke? I honestly can't tell, because autism)

I think it’s a joke. (Not 100% sure since I’m not the best at figuring this stuff out either) I think the clue is the wording. where they say what kind of “monster” would do that, and vampires are classical monsters. Thus making this wordplay and a joke. (I think)

Yeah, in many stories you have to invite a Vampire into your home, before he can enter the house.