The pillow was warm and comfortable under Jessica's head. As she lay, drifting into idle sleep, she heard a noise. Nothing disconcerting, just a repetitious shuffling. Strange, she thought, wondering if it was anything to do with her sister. They had shared a bunk bed for many years, Jessica being the elder, took the top bunk. The more she listened, the more she became sure it was coming from below - from Elle, her sister.
Her curiosity was piqued. What was she doing? And then a frightening thought crossed her mind - one which she simply couldn't shake. What if she was masturbating? This had never happened before. Neither of the sisters were particularly precocious, in sexual terms. But then Elle had just broken up with her boyfriend. Though her mind raced through possibilities, Jessica could think of no alternative, Elle must be masturbating.
Jessica's first thought, of course, was to switch off, to get to sleep and pretend this wasn't happening. But as it continued, longer and longer, Elle seemed to grow in confidence, becoming louder and louder - even emitting slight satisfied sounds from her young lips. Jessica could not but be curious - and could hardly ignore such curiosity. Before long she'd given up entirely on trying to sleep. She found herself even becoming aroused by the experience - the image of her writhing sister beneath became one of deep eroticism and suddenly appealed to her greatly. She found her hands roaming downwards, into her panties, imagining her sister doing the same thing. They always went to bed at the same time, and both had always slept in a bra and panties. She recalled the image of her sister removing her clothes and climbing into bed not 20 minutes ago. This image had meant nothing at the time, but it washed through her now, feeding her lust. The pert breasts below her white frilly bra, the delicate contents of her tight, slender panties. Her toned figure and shapely legs. She was a beauty (and Jess knew that Elle was made very much in her image - people often said they looked similar. The striking red hair helped with that, of course).
She imagined her sisters hand buried deep in these beautiful garments, writhing and probing, as Jessica continued to do precisely the same. But curiosity cannot be so easily abated - particularly not curiosity of a sexual nature. She had to see. She wanted to see the bliss etched upon her sisters face, glimpse the carnal secrets she was engaging in. She had to see.
Moving slowly to the edge of the bunk, she was careful to make no noise. Her hand grasped the metal bar which signalled the edge of the bed. Her head approached the precipice with caution, and her head slowly moved over.
There she was! And oh how Jessica wasn't disappointed. Elle lay below, her red hair bright in the darkness, bedsheets strewn haphazardly across her, with her eyes locked shut and her mouth pinned closed. She had a look of almost pain. She was biting her lip to keep from crying out. Both legs were wrapped around the quilt which hugged her midriff, under which her hands probed with a rapturous vigour. Her bra remained on, but her free hand caressed the surface of her breasts tenderly. Jessica noticed her panties discarded on the floor.
And then the worst happened. In her desperation to see more, Jessica toppled unceremoniously from the top bunk and smashed against the floor followed eventually by her quilt. As she opened her eyes, she saw Elle jump in shock and try to hide her activities. Elle though, did not fail to notice that Jessica had yet to remove her hands from her panties. As they surveyed each other hesitantly, she eventually clicked on and snatched her hand away belatedly.
'Erm...' Elle began.
