The Villainess and the Demon Knight Series by seikan, Nekota, Asahiko

Marquise Cecelia has awoken in the bedroom of the infamous Demon Knight, Lucas Herbst. His rough style of love has left the night before a blur, but apparently he's claimed her as his fiancee! Political shake ups have saved her from disgrace and losing her status. But Lucas's warped love will keep her on her toes... or her back...

VIOLENT DISASTERS TO VIOLENT DELIGHTSMarquise Cecilia is engaged to Lord Lucas, second prince in line for the throne and wielder of the fabled magic sword Eckesachs. Despite being rough in the bedroom, he’s completely devoted to her. But while Lord Lucas is busy battling dangerous magical beasts, Cecilia’s ex, the former second prince Felix, arrives unannounced. He’s unable to accept his treatment of Cecilia is what lost him his inheritance... moreVIOLENT DISASTERS TO VIOLENT DELIGHTSMarquise Cecilia is engaged to Lord Lucas, second prince in line for the throne and wielder of the fabled magic sword Eckesachs. Despite being rough in the bedroom, he’s completely devoted to her. But while Lord Lucas is busy battling dangerous magical beasts, Cecilia’s ex, the former second prince Felix, arrives unannounced. He’s unable to accept his treatment of Cecilia is what lost him his inheritance. He places the blame on Cecilia and attacks her! Will the protection magic around Cecilia hold out until Lucas returns? Or will she be at the mercy of Felix’s violent temper?! less