6.
Setting: uh...the one where Katsuki is a Dragon king/tamer and Izuku is an adventurer
Pairings: Bakudeku
Other relationships: Izuku (a.k.a the protective parent) and his baby dragon
Izuku finds an abandoned dragon egg. Something makes him want to keep it and try to take care of it. Except he has no idea how. Thus he decides to look for a person who knows such things. Unfortunately he finds out that his childhood friend's family was slaughtered. But he hears rumours about a new dragon king/tamer. He decides to give it a shoot. Except the dragon king/tamer is rather moody and not good with people and his dragons refuses to raise a dragon baby that doesn't belong to them. Still, Izuku stays with them because he needs their help (their fire, heat, etc. For the egg and so)