They decide to do a bodyscissors competition

Mary turns to you. "We are gonna need you to be the judge again." She says and, before you can refuse, pulls you closer and wraps her legs around your waist. You try to push them off, but they don't budge and just a split second later, she tightens them around you like a vice. You groan in pain and try to loosen her hold unsuccessfully.

Meanwhile, both Mary and Sarah watch your reaction attentively. "I bet i could make him writhe more than that." Sarah suddenly says. "Oh yeah? We will see about that." Mary replies.

Sarah reaches out to touch Mary's thigh, feeling the firm muscle beneath. As Sarah's hand roams over Mary's thick thigh, it eventually brushes against one of your desperate prying hands. They both chuckle at how hard you are trying, yet Mary's thigh doesn't even budge.