Finn sorta looks up to Dean in a rather "I hope I'm cool like you when I grow up" kind of way. Because of that, he's a little curious about him and where he comes from, what he's into, etc. And he still sort of wants a robotic claw arm someday, man. He doesn't care that Dean doesn't like vampires, because Marcy was eventually able to win Jake over who was absolutely petrified of her. Probably because she's a rock goddess.
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