You do not need to have read One Small Thing first, though it wouldn't hurt to get some more backstory on Dusty & Rue's relationship and all the references to what Dusty originally thought of Erik. Not necessary though. 
 Cute story. Maybe a touch long for the ground it actually covered, but very sweet once they finally got there. I was wondering toward the end of the story what else was going to happen because there was so much book left. Archer was the perfect party-boy a-hole brother you want to hope is redeemable but in the end you just hate, and he makes it easy. Asher was his exact opposite, and perfect for sweet Dusty. 
 The set-up for the next story is in this one also, but it's so basic that you won't have needed to have read this one before the next one either. There's little more than introduction to either Lane (Dusty's new co-worker) or Josh (a client of Asher's) in this story.