A Phoenix Trapped in Darkness (Kamideku)

For years, Izuku has been isolated and hidden from the entire world as he is the only one shares the same blood as AFO. Hisashi wants to be sure that his son is mated with a person who is certain to keep his only son safe to keep his lineage alive. Izuku was raised to be the perfect omega for a strong alpha.
Denki is the first person to ever bring Izuku to the world. They quickly catch feelings for each other but when Tenko finds out, he tries tells their father to try and get his brother with a strong villain and make his little brother isolated again to keep him safe.