Plot ideas
:

When Baku and Deku were 8years old they found a large egg
In a week it hatches to be dragon...
Are they now this dragons parents?

~or a toward skip
After a year dekus family moves out.
And the thief Deku breaks into a cave..not aware Kirishima  and Bakugo loved there and was guarding it

The thief Deku breaks into the Todoroki's castle and his caught by the heir..Shouto

(I can add more later)