Learn to Smile (Experimented AU BakuKiriKami)

Kaminari was kidnapped at the age of 5 by an highly wanted assassin named Silver Jones. He was taken to the boss who hired Silver and put into a 'hospital', where they experimented on kids with quirk based things. (The place where Eri would come from, run by Overhaul but before that owned by Overhaul's older brother)...