I Fell into a Situationship with the Vampire Count?!

Synopsis

"I would like you to become my lover." Daughter of a viscount, Freya Villiers was being pressured into taking back her ex-fiance, Nathan, after their engagement was broken off due to him cheating on Freya with her sister. In order to flee her parents, who are all for her reconciliation with Nathan, she visits Count Bloodbury, feared by the nobles as a "vampire." With nothing to lose, she asks him to pretend to be her lover and...?! (Source: Kodansha)