Amielle Castillo has been in love with her childhood best friend, Nikolai Hayes, for as long as she can remember.Growing up together, Nik was always there for her. He protected her, looked after her, and treated her like family. Unfortunately, that’s exactly the problem.To Nikolai, Amielle is nothing more than a little sister.And to make things worse, he’s been dating the school’s golden girl, Vivienne Collins, since freshman year.Amielle already accepted that her feelings would never be returned—until a new student transfers to their school.Iñigo Flores is charming, funny, and surprisingly easy to talk to. As the two grow closer, Amielle finds herself smiling more and thinking less about the boy she’s loved for years.But for some reason, Nikolai can’t stand seeing them together.Every laugh they share. Every moment they spend alone. Every time Amielle chooses Iñigo over him.The feeling in his chest grows stronger each day, and for the first time in his life, Nikolai begins to question whether Amielle was really just a little sister to him.Caught between first love, friendship, and feelings that arrived too late, the four of them are about to learn that growing up isn’t nearly as easy as they thought.Because sometimes, the person you’ve been looking for has been right beside you all along.