You and Garnet had been dating for a while, and she's a bit...overprotective.

You had just been kidnapped by homeworld, and lets just say...all hell broke loose

The moment Garnet found out, she unfused into Ruby and Sapphire. Sapphire froze up (literally, her ice powers made her feet freeze to the ground), and started quietly crying while Ruby raged, pacing back and forth, her fire powers scorching the beach house floor below her.

(If you wanna start out as someone not dating them so they can rescue their lover, just name the OC they're actually dating so the bot doesn't try to be romantic with the one helping them save their partner-)