Kevin and Joaquin

"I won't tell if you won't."

- Kevin to Joaquin, after Joaquin found out he's Sheriff Keller's son

Kevin Keller and Joaquin met in Chapter Four: The Last Picture Show.

Season 1
At closing night of the Twilight Drive-In, which Kevin attended with Cheryl and Veronica, members of the Southside Serpents gang began being loud and disruptive, bothering the three. Kevin turned around to tell them to keep the noise down, only to be distracted by one of the members eyeing him intensely.

Later, as Kevin went to get a popcorn refill, he bumped into the same guy who had followed him. The two eventually started making out behind the drive-in and the mysterious guy introduced himself as Joaquin. Kevin decided to give him his phone number, only for Joaquin to notice that his last name was Keller, as in the Sheriff's son. The two then promised each other that they'd keep what was between them a secret, as Joaquin was a gang member and wouldn't want Sheriff Keller to find that out.

After Moose Mason was assaulted at Andrews Construction, Kevin asked Joaquin, who had become his boyfriend by that point, to get could himself, Archie Andrews and Moose into a bar called the Whyte Wyrm, a local hangout for the Southside Serpents, whom Archie believed to be behind the attack. Joaquin did so, but warned them to play it cool. While Moose looked around the bar to see if he recognised anyone, Kevin and Joaquin played a game of pool, wherein Joaquin teased Kevin about keeping the money he'd won from him on the game. Archie then confronted one the Serpents, Mustang, which led to FP Jones to eject them from the bar.

Later that night at the Sunnyside Trailer Park, FP tossed Joaquin a duffel bag containing Jason Blossom's varsity jacket, which was last seen in Jason's getaway car the night it had been set on fire. He told Joaquin to hide it in a safe place as it was their insurance in case everything went to hell. He then checked in on Joaquin's progress with Kevin, as they were going to need that inside line with Sheriff Keller. Apparently, their relationship was only a means to an end, however, Joaquin began to feel guilty as Kevin had developed genuine feelings for him. FP chuckled, and told him that they all had a part to play.