u/AdSoggy196

I've been wondering what would happen if I, like a parasite, possessed the body of my friend, a 28-year-old woman. Despite being an adult, she has childlike mannerisms due to psychological issues. By taking control of her body, would my maturity override her childish behavior, or would her brain force me to act like a child? Also, would her voice change to sound like mine? And most importantly, even though she's already an adult, would anything about her physically change, like her gaze or gestures, to show that I'm now in charge?