Akuyaku Reijou desu ga, Watashi o Anata no Seidorei ni Shite Kudasai!

The Crown Prince publicly announces that their engagement is annulled and that she is to be banished. My efforts as the villainess's servant were in vain. Now she who could not avoid the doom flag, is telling me that she wants to become my sex slave! "Take my virginity! I am your sex slave. Fill my baby-room with your seed!" The young lady who was known as the "Ice Lady," her face twisted with pleasure, is begging me to come inside her, her hymen broken on a bed in a cheap inn. That haughty aristocratic noblewoman is as good as dead. Now I'm resolved to give her the best first-experience possible. I told her, "Oh, God! I'm going to come inside you! I'm going to make you my sex slave, just as you wish!" This is the story of Kite, a reincarnated squire who knew her doomed fate, and Chris, a villainess lady who becomes a happy sex slave.
(Source: Anilist)