Is my serious husband and I exchanged husbands with my sister and wife and having sex? Sister and couple swapping! I was taken by my super playboyish sister couple and exchanged my serious husband and my sister's husband and had sex! My younger sister, who I got married before me, was the opposite of me, who is only serious about me, and I was playing with her quite a bit and was what I meant to be a slut, but I thought she had settled down after getting married... When I happened to come and visit, I complained about my husband, my sister suggested "swapping for couples" and my good-mouthed little sister couldn't refuse, and she couldn't refuse... My sister seduces her husband where she can't see. I have secretly had sex with my younger sister's husband.