Trade places they did. There was a second or two where both sisters could give each other a quick hug of mutual support but then it was back to their assigned tasks. If Emily stopped to think about this she was sure her head would explode. Good job she didn't then, wasn't it?<br/><br/>She kneeled down on the floor and then shuffled forward so she was right under Katherine's heavy ballsack. One testicle was wet and slightly redder than the other one - obviously Scarlet had sucked that one. Emily decided that some balance was needed and that she should concentrate on the other one. Leaning up she wrapped her lips around the ball and kind of gobbled on it a little bit as she managed to take more and more of it in her mouth. Her tongue started to swirl and flick about in her mouth. A hand snaked up and started to massage the other wet one. She let out a delighted sigh. She was a good girl. She was doing what her mother wanted.<br/><br/>She couldn't really see Scarlet from where she was, but she could feel when she let go of her mother's cock because the whole massive appendage started to sway freely when not constrained. She let go of the ball for long enough to say "See what I said mum? She's the bestest cocksucker!" God she was such a slut. Talking like that in front of her mother! Before she could be told off she slipped the ball back into her mouth and started sucking it like crazy.<br/><br/>Emily was comfortable where she was, kneeling in between her mother's legs. She wrapped one arm around one leg, pulling it closer to her so she was kneeling right next to it. She started to stroke the inner thigh of her mother's other leg with her other hand. Up, down. Up, down. From almost her ballsack down the the silk garter holding the stocking up. Her mother's skin was so soft and smooth. Almost as soft and smooth as her own skin was. Emily assumed skin went wrinkly when you got as old as Katherine was. So far, she was being proved wrong. Risking being shouted at, she let the ball pop from her mouth again and kissed the smooth patch of skin on the leg next to her head. God it was so soft it was unbelievable. She kissed it again before going back to the ball.<br/>