Extinguished Flames (Shouto Todoroki X Reader)

Todoroki Shouto and Todoroki [name] lived... wait let me correct myself;
Todoroki Shouto, Todoroki [name], and Todoroki Seiya lived altogether in the [last name] manor, yes, on the 9th of December the Todoroki and [last name] heir was born. The girl named Seiya was all over the news and everyone knew her, and by everyone I mean EVERYONE. On the 16th year of her life the war began once more, Shigaraki's against the [last name]'s and now with the Todoroki's. Luckily, U.A. class 1-A graduates came to help.

Did they survive it all? Will the Todoroki's and [last name]'s survive? Will Seiya live until to marry her arranged or chosen partner? Or will the Todoroki and [last name] line end with them?

(Basically book 2 of Royal Flames)