A/N: It's impossible to write something even a little smutty in 100 words. :( Here is my pitiful attempt.
Secret
Her arms were round his neck, mouth pressed against his throbbing pulse. He was quivering, his fingers wrestling desperately with the buttons on her blouse. Carefully she guided his hands away, cupped them round her breasts. He gave a quiet moan of longing which she silenced with her requisitioning lips.
Slowly her hands brushed against the waistband of his trousers, her fingers brushing against his skin. Enticingly, her hands came to his zipper…
A bell rang.
Abruptly, Kim pulled away, heading for the storeroom door. Through the darkness she whispered huskily, "Don't worry, Mr Treneman, it'll be our little secret."