Shoufu Ochi Tsuihou Reijou to Reikokuki Kishi no Dekiai Sugiru Zetsurin Shoya: Aichoume no Shuuai de Maiban Dakitsubu Sareteimasu

"Just feel it instinctively, and surrender everything to me." She expected to be roughly embraced and crushed, but instead she was showered with sweet and passionate love...!? Lady Ritua, falsely accused and with her engagement broken off, is banished to a high-class brothel. Her first customer is Sir Gilgard, a cold-hearted knight infamous as the "Night-Roaming Marquis," and she is thrilled when he gives her an intense gaze and buys her freedom... Just when she thought her life as a concubine was about to begin, she is melted into a puddle by his sweet and sensual caresses!? Reaching climax after climax from the overwhelming pleasure of her first experience, her body greedily craves Gil--... Loved too much by the cool and devoted cold-hearted knight, she enters the path from prostitute to doting knight!?

(Source: Overlap, translated)