Koushaku-sama wa Yakutatazu Reijou no Kisu ga Hoshii ~Munouryoku to Hazukashimete Kita Watashi ga Dekiai Sareru nante

In this world, women with exceptional magical powers can enhance the abilities of men they recognize as their "mate" through kissing and physical intimacy. However, Baroness Fiona, who possesses no magical powers, is ridiculed by her family as useless and treated like a servant. One day, at a party held at Fiona's house, Jayden, the "Duke of Cold Flames," appears and notices her hidden power. Then he tells Fiona—"Be my partner."