Unintentionally engaged in anal intercourse with stepbro while cheating on boyfriend, feeling guilty and ashamed

In a moment of weakness, I found myself succumbing to temptation and indulging in some forbidden pleasures. The tension between my stepbro and me had been building for quite some time, and it finally reached a boiling point. As I was eagerly pleasuring my stepbro's throbbing manhood, I suddenly realized that my boyfriend was on the doorstep, knocking on the door. Panic set in, and I quickly tried to hide my stepbro and myself. However, my actions were too late, and my boyfriend caught us in the act. The sight of him witnessing our intimate moment was too much for me to bear, and I broke down in tears, consumed by guilt and shame. As he stormed out, leaving me alone with my stepbro, I could only hope that he never found out about my betrayal.