Just One Kiss by Eliza Manton

Universal girl code: the best friend’s brother is always off limits.
It’s the easiest code to follow because it’s just gross.
But what happens when it’s not gross? What happens when your best friend’s brother suddenly becomes hot? What happens when he kisses you and sparks fly?
And what happens when you’re thrown back together and he makes himself so unavoidable that the temptation to kiss him again becomes overwhelming?
I guess we’re about to find out …