Penny Birch 
Fit To Be Tied [EPUB ebook] 

When submissive minx Penny Birch finds herself chastised by the matronly Marjorie Burgess in front of her colleagues, the situation is so outrageously old fashioned that Penny assumes the older woman is playing an erotic game with her. Doubly humiliated when she is caught gratifying herself over the experience, only to find that Marjorie was entirely serious, Penny comes up with an unusually kinky face — and job — saving solution.