Workaround
Here, as you can see, regular customer-mistress Ms Mukta has draped two of her dirty, white socks over my humble head in order to 'air' them overnight on my footslave face. It is such an honour to be her socks-airer, and to spend the night surrounded by her sweet feminine sock stink!
My only quandary is what to do if another customer presents their feet to me for kiss-respecting and/or lickshining, as I must endeavour to keep my head as still as slavishly possible (Ms Mukta has forewarned me that if either of the socks has inadvertently slipped off my head during the night when she comes to collect them in the morning, she shall have me sorely whipped!)
Fortunately, the only customer-mistress to require my footlicking services overnight is wearing heels and kindly presents her feet to me in such a way that I can get away with minimal neck and head movements as I tongue-attend to her dirty boots. Ms Mukta's dirty, draped socks therefore remain in place!
The late-night customer, quite rightly, mocks my 'dirty-sock ears' whilst I service her footwear. I would have willingly had her sweaty, grey bootsocks draped over my overnight face also!