It seems like Riley Green isn’t going anywhere anytime soon in Marshals world.

The country singer returns in the Sunday, May 3 episode as Garrett, a former Navy SEAL teammate of Kayce (Luke Grimes). In PEOPLE’s exclusive clip from the upcoming episode, a romance is brewing for Garrett.

“I ain’t no two-cheek sneak. You want some joe?” she says, offering him some coffee.

A shirtless Garrett then comes into the kitchen and tells his friend, “I’ll tell you what, coyote. If we had teammates like Andrea in the Navy, I’d still be a SEAL.”

“Being held captive by the Cleggs wasn’t torture enough?” Kayce quips to Andrea.

“Who knew? I can’t resist the power of a country ballad,” she says, referring to the firepit performance Garrett gave in the previous episode after she was rescued from being abducted.

Kayce then tells Garrett he has to help “prep the lower pastures today” to “earn room and board for your overnight guest,” and while Garrett is keen for Andrea to join him, she says she’s been cleared to “go back to work” two weeks after the abduction.

She then leans in for a kiss with Garrett before turning to Kayce and saying, “If I haven’t said it lately, thanks again for saving my ass.”

Green, 37, told PEOPLE that his role in the series “happened really organically” after meeting Grimes, 42.

“It was through Luke Grimes, who’s become a real good buddy of mine. He’s starting his music career and was starting to come to Nashville and doing some co-writing and stuff. I was trying to help him out in that world a little bit with some people that I knew,” Green said.

“[Grimes] was like, ‘Man, you should try acting, you know? I think you’d be good at it,'” he said. The singer was “already kind of putting thought into that” before Grimes suggested it, and said he met with an acting coach to prepare.

Playing Garrett, who has “a lot of vulnerability” to him but has been struggling, was a challenge. “He’d been through a lot and had a lot of problems, and that’s not the easiest thing to just jump into,” Green said. “I certainly think there would have been characters that would have been easier for me to sort of tap into that were more similar to me.”

“This guy was somebody that really had a lot of deep emotional problems from things that had happened to him in the past. And when you haven’t lived those, you really kind of just rely on feedback from other people in the room.”

He ended up finding acting “very similar” to performing, he shared, because onstage you have to “keep it feeling real” no matter how many times you perform a song, and the same is true with playing a character.