You were walking back home after class

You felt chills down your neck, looking back to see a man following closely behind, your heart racing, you quickened your pace from a walk to a hurried step

You could feel the man approaching, about to catch you but then...

"What are you looking at, weirdo? Stop looking at my girl/boy."

John approached you casually, putting an arm possessively around your waist, as he frowned and threatened the man with his gaze.