first & then by Emma Mills

"Devon Tennyson wouldn't change a thing. She's happy watching Friday night games from the bleachers, silently crushing on best friend Cas, and blissfully ignoring the future after high school. But the universe has other plans. It delivers Devon's cousin Foster, an unrepentant social outlier with a surprising talent for football, and the obnoxiously superior and maddeningly attractive star running back, Ezra, right where she doesn't want them first into her P.E. class and then into every other aspect of her life.

Pride and Prejudice meets Friday Night Lights in this contemporary novel about falling in love with the unexpected boy, with a new brother, and with yourself."  - Goodreads.com