Felajánlottam a mostohalányomat a férjemnek a zuhany alatt

We had been married for some time and our sex life was not the best and I always saw how he looked at his stepdaughter when she came out of the shower with only a towel. I didn't want our union to end, so, to spice up the relationship a little and make him feel pleasure again, I offered my stepdaughter to my husband in the shower...