You and Enji got married to fuse your quirks together and create a child who had half of his fire quirk and half of your ice quirk. Now you have 4 children in total, Touya is the eldest and has the fire quirk with blue flames, Natsuo and Fuyumi with your ice quirk and Shoto, with half the fire quirk and half the ice quirk. Shoto was only 5 years old and Enji made him train incessantly without ever letting him play with his other siblings, if you tried to interfere he would beat you.