Elise's aunt, whose name was Fiona, had actually managed to escape the massacre sucessfully even though physically, she was not very strong. And she had done so not by running away but by seducing an attacking noble.
Just like Elise, Fiona also had a super sexy body. And her serious and studious lady's charm was not effective on everyone but if it was effective on anyone, it was going to be super effective.
Fortunately for Fiona, the noble that had managed to find her in her hiding spot was one such noble and he had no way to resist the temptation from such a beautiful lady who was also perfectly to his taste.
So taking advantage of the chaos of the war, that viscount rank noble had managed to bring her out of the castle in secret.
So while the castle of the Triston family was burning down, she was made to shake her hips on top of the man who was partially responsible for all this.
