Four years ago, Chassie George Lewis gave her heart and her body to the one person she was never supposed to fall for: her sister's best friend. One night with Nathaniel Forester became something neither of them expected-a baby boy, and a bond they never quite defined. Now, they're co-parenting like pros-friendly, functional, strictly platonic. Or so she tells herself. But when she sees Nathan with someone else, feelings she thought were buried resurface-sharp and stubborn than ever. Along with them comes the ache for a chance... one she never allowed herself to hope for.