Freeform, set in a fictional fantasy world.
A traveling teen is attacked on the road, and saved by a Witch on her broomstick. After he continues on his way, she follows him, and becomes very clingy, being silly, making fun of him, and just generally being a lovable nuisance. She keeps trying to convince him to be her boyfriend, but he isn't about to give in.
Nothing dissuades her, and she'll follow him everywhere on her broom, making his life a giggly hell until he finally submits or hides underground. And the latter will only stop her however long it takes her to dig.
I wanna play the Witch :)