‘Chicago Fire’ Season 5 Spoilers: Casey and Dawson Head To Happily Ever After? Mysterious Person Inside Firehouse 51 Writes Fiction Based On Coworker’s Story

"Chicago Fire" Season 5 has just premiered its first episode. But if Episode 1 is explosive, fans could expect more exciting things packed for the rest of the season. On romance side, Matt Casey (Jesse Spencer) and Gabriela Dawson (Monica Raymund) have reunited. Will they finally have their happy ending? Severide (Taylor Kinney) and Stella (Miranda Rae Mayo) are off to rough start, and who could be this mysterious person inside the house who writes romance fictions based on coworkers?

Following Casey's decision to come back to Dawson at the end of "Chicago Fire" Season 4, the love between Casey and Dawson have reignited and looks stronger in "Chicago Fire" Season 5. Jesse Spencer revealed to E! News that Casey and Dawson have committed to building a family together with Dawson's foster child, Louie.

"They've been back and forth so much I think it's good that they're going to commit to each other and do this thing," Spencer said. "He's a family man at heart-probably-and he's always wanted kids, and it didn't come in the way he expected or necessarily wanted," he added.

Stella and Severide, on one hand, are off to a rocky start, which followed a traumatic experience wherein Stella's ex-husband Grant (Guy Burnet) tried to hurt both of them. "Going through something dramatic and traumatic puts a strain on the relationship," EP Michael Brandt told Entertainment Weekly.

Meanwhile, spoilers also tease about a steamy storyline for another couple. An online blog has been discovered online, and one of the stories feature Mouch and Brett. Brett happened to come across the erotic firehouse-themed fiction when she realized that there is so much reference to her coworkers in Firehouse 51. They will try to find out who this mystery writer of the blog, which is apty titled "FeelTheBurn.com." Do you have a guess?

"Chicago Fire" Season 5 airs Tuesdays at 10 p.m. on NBC.