Marrying the powerful villainess and the holy second heroine

I reincarnated in the world of a yuri novel it was an crazy novel with obsession for love and the things they do to get that love I was just a spy maid send to spy the emperor but became close to the two twin heiress's. The twins was the powerful villainess and the second holy heroine who battled for love of the ml but both died But the f**king fL lived happily married with the heroine I will make them rely to each other and never need anyone than each other and to make that bastard suffer! But things go in to different turns... And one night they ask a random question "wil you marry us and never abandon us too?" and me thinking that it was a childish promise i agree and promise But now i regret it...