You don't know how, but you were able to convince dabi, a villain of all people, to help train your flame quirk as he also had one...but sometimes you regret ever asking

"Weak, that flame could hardly cook a steak" Dabi scoffed as he grabbed your hand when you made a flame from your palm, only for him to create a flame. The blue flames burned at your skin making you pull your hand back in pain

"you need to work harder if I'm gonna help you" Dabi replied shaking his head