Stranger on the bus

My sub had been distracted all day. She had been told to read her task on the bus when she finished work. She knew that she was to find a seat and take her coat off to cover her lap and unbutton her trousers. John had been specific. It didn't matter if she was in a seat on her own or if someone sat next to her, she was his owned slut and she needed to taste her juices and cum for him. She had already removed her coat as she boarded the bus. She moved to an empty seat and undid her trousers as instructed. Her clit was already throbbing and her plug was sitting deep in her arse. She knew she had to suck two of her fingers and put them covered in her spit into her wet cunt. Her nipples were like bullits as she shuffled over. Her heart lept as a man with a shopping bag moved towards her and took the seat next to her. She knew everything about her was screaming stop but that John would order her to complete her task and tell her not to be ashamed of her sexual appetite. She could feel his leg resting against hers as she gradually eased hers apart. She coyly put 2 fingers in her mouth sucking them and trying not to look at him and then snuck her hand down under her coat. Her heart was racing but she stared straight ahead and moved her fingers into her open trousers to her already sopping cunt. She eased her legs apart further resting one leg on his and slid 2 fingers into her cunt. They squelched making an obvious sound as she worked them in and out. She could sense his presence but had been told not to stop whatever happened until she came. She was aware that the coat was moving slightly as she thrusted them in and out but was getting close to orgasm and starting to care only about that.
It was then she felt it. Her coat lifted and his hand on her trousered leg. She stifled a scream and looked sideways. He was smiling at her and said carry on. She took a gulp of air and continued. A voice whispered in her ear, lift your bum. She did as she was told and felt him pull her trousers down to her to her shins. With more freedom now his hand moved up to her cunt and two gnarled fingers replaced hers. He started pumping hard and deep while she played with her clit. She knew she was so close but knew the reality of what was about to happen. Her head rocked back as he pumped her harder. She muffled her scream as she came hard and squirted all over his fingers bucking her hips and forcing them deeper inside her. As she came down off the orgasm he removed his hand from her licking the juices from his fingers. He got off 2 stops later without saying a word leaving Laura sitting in a puddle of her own juices like a rag doll spent for the rest of her journey.
She had never done a task like that before. She was overwhelmed by the shock of what she did but new that the excitement she felt made her vulnerable to carry out more flagrant tasks. When she told me what had happened on the phone she came again just by retelling the story and teasing her nipples.