What happens when a piece of a failed relationship comes back, in the form of a 15 year old girl named Bella? To Louis, she's a student who's mental health is declining due to her struggles with being the child of a single parent and not knowing her other father. To Harry, she's his daughter who is part of the man he still loves, the man he swore on his last breath he'd marry and live together with him forever. And maybe this time, they will last forever. (OR the one where Louis is Bella's teacher and hears her daily rants about how hard it is to no know her other father; her other half. Soon he comes in contact with the man he once loved with his whole heart in high school and finds out he's the 'dickhead that left my dad while he was pregnant'. )