Never Be /l.s.

Monica: You've got to see her again.
Ross: And why do you care so much?
Monica: Because! You could get to live out my fantasy!
Ross: You had fantasies about Emily?
Monica: No! Y'know, the fantasy! Meet someone from a strange land, fall madly in love, and spend the rest of your lives together.

The one where Harry Styles moves to Connecticut from England for nine months as a part of a study abroad program, and he just so happens to move in with Louis Tomlinson and family.

This story is from ao3 so all credits goes to cherrystreet on ao3!!