I am a mediocre salesman at a construction company, and I am in a relationship with a married woman I met on social media, Yumi... I thought of her as a "convenient mistress" because she accepted everything I wanted, and whenever I got stressed, I would call Yumi and indulge in lewd acts... But it was because she was a mature woman with the composure to accept all my requests, and her mature charm, which showed me that composure, made her a bewitching beauty who drowned me in both body and Kokoro.