Haitoku no Koi no Senritsu (Sonya Bunko) [Light Novel]

[Machine Translation] For the sake of her family, Nasha marries a count who is as old as her parents, but not only is she not married to her husband, but she is also presented as the crown prince's mistress. She is treated like an object and feels empty of her existence, but an encounter with Gunther, the king's bastard son, changes Nasha. Gunther, on the other hand, is bitter that Nasya has become the crown prince's favorite concubine despite the fact that she has a husband. However, as he learns of Nasha's naivete, he is unable to suppress his attraction to her, and finally they spend an immoral night together...?

家族のため、親子ほど歳の離れた伯爵に嫁いだナーシャは、夫とは夫婦関係がないばかりか王太子の愛妾として差し出されてしまう。物のように扱われ、自分の存在を虚ろに感じるが、国王の庶子ギュンターとの出会いがナーシャを変えていく。一方ギュンターは、夫のいる身でありながら、王太子の愛妾になったナーシャを苦々しく思っていた。だが、ナーシャの純朴さを知るにつれ、惹かれる気持ちを抑えきれず、ついには背徳の一夜を過ごしてしまい―!?