Booth and Brennan officially get together in Season 6, Episode 22 of "Bones," titled "The Hole in the Heart." This episode features a tragic loss that brings them emotionally closer, and they share their first night together, marking the start of their romantic relationship. Following this, in Season 7, Episode 1, it is revealed that Brennan is pregnant with Booth's child, confirming the deepening of their relationship. They had a slow-burn romance leading up to this, with significant moments including Brennan confessing her feelings in Season 5 and their first kiss in Season 3. They eventually get married in Season 9, Episode 6 ("The Woman in White").