Shin, my husband's younger brother, came to visit after a long time. We were classmates and have always been close. Seeing him, I couldn't help but feel mischievous, though I was careful not to let my husband notice. While chatting together as a trio, I secretly teased Shin by lightly touching his crotch with my foot, enjoying the thrill. When he realized what was happening and stood up to escape to the bathroom, I chased after him and started sucking his cock. That day, he managed to avoid getting caught by my husband and breathed a sigh of relief—but from that night on, his attitude began to change slightly.