I kneel tied up waiting, anticipation, excitement and a small amount of fear flowing through my horny body, my cock twitching in its chastity cage, as I hear unrecognisable footsteps coming towards me in the darkness. 

I feel the cock against my lips and obediently open my mouth, allowing it to slide over my tongue, filling my mouth with its taste as it forces itself down my throat as I suck on it hungrily, my own cock straining in its chastity cage as I playfully struggle against my restraints, unable to do anything to stop the stranger from using my throat, cutting of my breathing as he fucks my face. As always I'm bound and blindfolded, my master never allows me to see or know who I am serving, never knowing what they will do with me, they are instructed never to speak to me, only to use me however they wish, my bound, blind, vulnerable and helpless body completely at their mercy, and I am of course never allowed to ask questions, only to say yes to their instructions and thank them for using me, maybe beg for them to play with me or feed me their cum, anything else is punished with a week with a ring gag locked on. As a result I never know who I am serving, I know a few are regulars, recognising the feel of their cock, how rough they are, their smell and the sound of their grunts as they cum, but that's the only information I can get, the owner of the cock currently choking me is new, they could be anyone, a friend, work colleague, someone I hate, someone who works in the local supermarket, one of my neighbours, the postman, or just some complete stranger. I enjoy the thrill of not knowing, not even knowing how much my public image has been ruined by my master, with everyone who uses me told never to tell me, to keep the mystery alive. None of my friends or family could know or maybe everyone knows and talks about me behind my back, knowing that I willingly degrade myself to anyone my master wishes, that I moan and drip in my chastity at the taste of cock, begging to be fucked like a whore, hungrily consuming cum and piss, willingly being a bound sex slave and stress relief for anyone who wants to use me, no matter hiw rough they are with me, I'm just clearly happy to be fucked. 

I do wonder though when I'm out and about going to work or the shops, every now and then strangers give me a knowing look, people I've never met stare at me as if knowing something about me that I don't or seem to be looking through my clothes as if they know exactly how I look underneath, a hunger and desire in their eyes. Maybe they are one of the many people that I have pleasured with my body, or maybe they've seen the videos master posts online, ones with an advert for my services, maybe they're a future client who now knows I'm nearby enough to have a quick fuck. The mystery keeps me constantly horny, my cock straining with every glance, whisper and quiet laugh, wondering if they're in on the secret, the secret I will never be let in on, never to know who has used me or who knows about my life as a bondage slave and whore for sale. 

I moan as the stranger's cock unloads his warm cum down my throat, enjoying the taste as I hungrily swallow it down, knowing that I'll never know who's cum I've consumed, my straining cock dripping at the thought, hoping that they aren't finished with me just yet.