Hinako and I have been living together for a year, and maybe we’re in that ‘stale’ phase of love people talk about. Not exactly—I still love her and want to fuck her gorgeous body. But Hinako’s been cold toward me and rarely lets me have sex with her. Lately, she’s been going out drinking with her company, always coming home late. Suspecting she’s cheating, I asked my trusted junior Yuto to investigate. I’d invite Yuto over for drinks, then make an excuse to leave but actually hide somewhere in the house. Yuto’s job was to get Hinako talking about her affair. Four days later, the plan went smoothly at first, but I didn’t expect Hinako to seduce Yuto! I tried signaling him to stop, but he ignored me and fucked my beautiful girlfriend right in front of me! Not only that, she sucked his dick and let him go bare—things she’d never do for me no matter how much I begged!