Sweet Sofie by Elizabeth Reyes

Her entire life, Sofia Moreno has dealt with overprotective brothers. With her three older brothers always lurking, no boy would dare reach out to her. Luckily for Sofia, the one boy she’s got her heart set on has always been within reach: her brother’s best friend Eric, even though his loyalty to her brothers runs deep. Sofia knows there is only so much he can do before giving in to her.

Publisher Description

Two years older than her, Eric Diego has always known there would be hell to pay if he messed with his best friend’s kid sister, Sofia. Through the years, he watches as she blooms into a beautiful young lady right before his eyes. With teenage hormones raging and Sofia more than willing, Eric agrees to the unthinkable: a forbidden secret romance. Feeling emotions and a feverish passion that’s new to them both, neither is ready for how quickly their romance spins out of control.