Step-sister's reaction to accusation of adultery with her husband

In a wild encounter, I find myself entangled in a forbidden romance with my stepsister. After a passionate session, she confides her suspicion of me sleeping with her husband. Distrustful and angry, she confronts me, leading to a steamy threesome with her husband joining in. The intense action culminates in a mind-blowing climax, leaving us all satisfied and eager for more.