Watch

The original girl stripped off completely and watched the show her clone was putting on. She cupped her breasts, pushed them together and squeezed them. Her fingers began to rub her nipples, slowly they hardened and became erect. The original girl does the same thing, mirroring her clone. The clone slowly turns over and moves onto her hands and knees on the desk. Facing away from the original girl, she shows her round firm ass to her 'sister'. Her large breasts swing freely down, the clone shifts to rest on her forearms. Her breasts are now pressed tightly on the desk, she moves backwards and forwards slightly so her nipples rub on the desk. Flicking her head to get the hair out of her eyes she looks at her twin.

The original girl wet a finger in her mouth before sliding it inside her twins hot pussy, rubbing her clit with the other.
"Oh..Ahh.." Two more fingers followed pumping her pussy, covering her fingers in juices.
The clone began to move her hips in time with her sisters thrusting fingers. The original girl moved her free hand to her own pussy. It was dripping wet and two of her fingers slid inside easily. She began to pump the fingers in and out of herself in the same rhythm as she pumps her fingers into her twin.

You shift your body a little, you place one hand between your legs. A small wet patch is slowly forming. You watch the twin’s rhythmic motion, without even realising your own hand has begun to rub your pussy through your clothes.