It's vacation time for the family, in the hotel room, Mom goes for a shower while stepsis,stepbro change into their bathing suits turning back to back, she cannot resist her curiosity,decides to peek on her stepbro's dick, he catches her,is startled, but stepsis is turned on by the size of that dick,persuades stepbro to give him a blowjob,sex until they get interrupted by stepmom who almost caught them.