We go back in time to Brennan and Booth's first case, and while investigating, Brennan asks Booth if he's seeing anyone. Booth tells Brennan he'd ask her out if it wasn't prohibited for agents and consultants to be romantically involved. After they met in a bar after hours, Booth confesses to Brennan that he has a gambling problem, and they kiss. Brennan even tells Sweets "there was tongue contact." But they argue about the case, leading Brennan to slap Booth. They tell Sweets that it took a year before they could be in the same room together again. After they leave Sweets' office, Booth takes his advice and tells Brennan that he wants to give their relationship a shot and kisses her. But Brennan says no and that she doesn't have his open heart because she's a scientist. They agree that they can still work together but Booth needs time to move on.