[When Izuku inquires further, a sly smirk that was on the blonde's face spreads into a malicious looking smile. One with fire behind those eyes, and he leans in while he tells Izuku of his plan.]

Y'know that weird shop? "Riki's"? It's got all kinds of magical bullshit you can buy, and one of the big ticket items is somethin' I'm interested in.

[Katsuki has yet to partake in any of the stuff from that place, but it's where Hijikata is able to expand their home with the use of magic. So he's looked at the wares a couple of times out of curiosity.]

There's a potion that gives 'ya whatever super power you think up, and I've been thinking of using it to give myself my mobility back. Not by giving myself more explosions, but by giving myself rockets.

[He probably could give himself something similar enough that his right arm could use explosions just as his left but then what's the point of the mechanics he had installed if he did that?

If he only gave himself the ability to shoot rocket like explosions from his hands, well... now he's cooking.]

My automail should be able to use magic. I was told it works with the season stuff so I don't see why this wouldn't work, either.