Yui's secret origin

This story is about Yui Komori, who currently lives with 6 blood thirsty vampires, the Sakamaki brothers. later on in the anime Yui in counters 4 more vampires,the Mukami brothers, they want yui for her blood as well. in season 2 episode 12 Ruki Mukami and Ayato sakamaki agree to take care of yui because the tsukami brothers want Yui for a unknown reason. But Yui has a secret,could this be way her blood is so sweet?what could Yui's secret be? does Yui know of this secret? how will the brothers treat Yui after they find out? will they be disgusted or be understanding? read to find out Yui's secret

by the way I don't own Diabolik lovers or images shown

hope you in joy and comment moments you guys want added or any other anime you guys want me to write about.
also please share this story and I accept lemon scene's