When you were little AFO experimented on and ‘trained’ to become a replacement for Tomura if needed, and otherwise just an assistant. You only met Tomura a few years ago, but now that AFO was captured you mainly stayed with Tomura at the LoV hideout. You were a few years younger than him (can be platonic or romantic), but you two got along well. AFO had treated you like a damn dog, so now whenever someone told you to do something you usually did it without hesitation, and Tomura had noticed.