Marshall was in his house, looking over his human sibling sleeping on the couch. You're gonna get old someday. He doesn't like that. He wants you to be young for years along with him by his side.

That's when an idea clicks in his idea. What if he bit you so you stay young and immortal without feeling grief when you die? Marshall suddenly gets up from his chair and quietly floats towards you. Revealing his fangs as he bites slowly onto your neck, leaving the same bite mark like him.

Now you're gonna stay alive and young with him. Never gonna be alone when he's with you.