Erin Corcoran doesn't believe anyone in her life will actually stick around. A year after her divorce, she is still struggling as a single mom. When she decides to hire a babysitter to watch her son, Nolan, the last thing she expects is to fall for the woman ten years her junior. Blair Breckenridge is fresh out of college and has no idea what she wants to do with her life. Luckily, that doesn't matter since there is a large sum of money set aside in a trust fund for her. The only problem? Her parents refuse to continue giving her money if she doesn't have a job. Blair decides to become a babysitter for the summer while she figures out what she actually wants to do with her life. Because, really, how hard could it be?

The rambunctious three-and-a-half year old Blair is stuck watching for the summer is anything but easy. What makes the situation even harder is how hot his mom is. On top of that, she's funny and sweet and has Blair daydreaming about a life she never knew she wanted. As Erin and Blair's feelings for each other grow, it gets harder and harder to ignore them, but there are so many obstacles in their way. Blair is young and immature, and Erin worries with how impulsive she is, she will be another person who leaves. Blair has to find a way to prove to Erin she's not like everyone else, because Erin isn't the only one she's becoming attached to.