Those Sweet Words by Kait Nolan

Good old, reliable Pru. Of the four Reynolds sisters, Pru is the natural choice to take on custody of the girl their late mother had planned to adopt. At thirty, suddenly becoming the mom of a teenager means big changes, but Pru’s ready to do whatever it takes to adopt Ari. Before she settles down, though, she wants one thing for herself.
Enter Flynn Bohannon, the sinfully sexy Irish musician in town for her sister’s wedding. He’s led the kind of free, vagabond life Pru can hardly imagine. Definitely not the kind of guy she should be dating, but he’s the perfect guy for a crazy fun fling before her life changes.
When Pru proposes a brief, no strings affair, Flynn’s not about to say no. But when unexpected complications endanger the adoption, the two find themselves in a phony engagement.
Now they have to convince a sharp-eyed, skeptical social worker, a teen who’s too smart for her own good, three dubious sisters, and one protective brother-in-law that Flynn’s willing to give up the gypsy life and settle down. But in convincing everyone that this relationship is real, will they convince each other as well?