Firestorm

"Don't mess up that pretty face, Phoenix."

- Jett, when the round starts.

Firestorm is the het ship between Phoenix and Jett from the VALORANT fandom.

Canon
The two are fellow agents of the VALORANT Protocol and were likely recruited either very close together in time or at the same time. As Phoenix's Agent number is '09' and Jett is '10' which implies that Jett joined right after him. They share an outgoing and reckless personality and are shown to be good friends. Jett frequently calls Phoenix "pretty boy" and actively cheers for him.

Upon killing each other's mirrors in battle, they both apologize. Jett calls Phoenix a "pretty boy" again in her version of the voice line.

It's unclear when the events in the Duelists cinematic occurs, but it was likely before

In the Warm Up cinematic, Phoenix 1v1's Maxbot, and Yoru makes a bet that the bot will win. Jett retaliates by putting her faith into Phoenix and betting on him winning. Despite Phoenix losing and costing Jett's creds, she persists with continued faith in him and keeps betting on his victory. Phoenix and Jett end up fighting Maxbot together as a team with Sova, Raze, and Killjoy; Phoenix creates a wall of fire to block the bot's views allowing Jett to leap up and attack from above.

Fanon
Firestorm is the most popular ship for both agents and is widely regarded as one of the few "canon" ships in VALORANT due to both being the "poster child" of RIOT and being the few characters who seem to genuinely like each other. However, their romance has never been confirmed and the voice lines could be interpreted as friendly flirting between friends, not romantic interest.