Undercover - Steve Harrington x Y/N

When a fellow experiment escapes, a girl from Hawkins Lab is sent out to find her. She is instructed to bring her home. During her mission, she is also asked to look into the disappearing of a boy.
She's given a fake parent and a home. She is enrolled in high school as to not draw attention to herself.
But everything slowly changes. She finds the girl, but can't turn her in. She knows something else is wrong.
She meets a boy. His name, Steve Harrington.