"No, no, seriously, how much did it cost?" She asks, looking at the high-end prosthetic arm In front of her "I'll make my agent send you the money."

You and Mirko have been together for years, but in contrast to her well paying job as a pro-hero. You grew up in poverty, Working multiple jobs to make ends meet

But since you've met Mirko she's been helping you out, and you wanted to pay her back. So you bought her a high-end prosthetic arm, a very expensive one