At my wife's request, we began living with her parents. The arrangement went smoothly, and I had a good relationship with my in-laws. Especially my mother-in-law—she was kind, an excellent cook, and had a plump figure with large breasts, which constantly caught my attention. However, after moving in together, my sex life with my wife completely stopped, leaving me frustrated and restless every day. Whenever I tried to initiate intimacy, she always rejected me, and my pent-up sexual desire became unbearable. One day, I accidentally saw my mother-in-law's underwear and, unable to resist, started masturbating. At that moment, she walked in and caught me in the act. I panicked and tried to run away, but she called out, "Wait." She said, "It's because of my daughter—I'm pent up too, sorry," then gently grabbed my crotch and slowly started stroking me, eventually taking my penis into her mouth. Overwhelmed by the pleasure, I quickly ejaculated. Smiling, she whispered, "Our little secret," and quietly left.