They can both sing, and sing well. They just don't do it in front of other people. Marionette because she has slight stage fright, surprisingly. SP because she is kind of disgusted by it, he knows she isn't supposed to sing but he does it anyway. Poor Security Child.
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FNaF Headcanons (Mostly Daycare Attendant)
RandomJust some of my FNaF headcanons, nothing special