Stepmother shares her new husband with her stepdaughter

The divorce was very hard and the woman remarries but with a guy much younger than her. The stepdaughter was in love with the boy but never said anything to her stepmother, because she saw that she was in love too. On the day of the wedding the woman gives her new husband a blow job and the stepdaughter surprises them in the middle of the act. The stepmother, far from throwing her out, invites her to join them; everything stays in the family!