Decision

Izuku and Bakugo are married and have a 5-year-old son named Natsuki.
But Katsuki has an ex-wife named Camie and a son named Erick with her. Even though Izuku is her husband, he's always with Camie and Erick because "he doesn't want to leave his son without a father, and since Camie is a single mother, he doesn't want her to suffer. "
Always neglecting Natsuki, the little boy always wanted to spend time with his father, but he was always with his ex-partner and son. Katsuki even skipped dates like Natsuki's birthday to go with Camie because his son was crying, or he would even give away Natsuki's toys with the excuse, "Your brother needs it more than you do. "
There was no infidelity; Katsuki was simply more present with his former family.
It's Natsuki's 8th birthday today. Izuku took care of the whole party. The boy's friends arrived, and Natsuki waited for her father, but he never came.
That night Katsuki arrived late saying
Katsuki: Erick wouldn't fall asleep, I had to stay until he finally did.
as she approached to hug Izuku around the waist
(You're Izuku)