I was at home alone that evening when an unknown number rang my phone. I answered it tentatively.
"Good evening, this is Mr Charles' driver. He has asked me to pass a message on to you: he will be dropping by briefly within half an hour with two work colleagues to whom he would like to introduce you. They are en route to a business dinner event but are running ahead of schedule. Mr Charles requests that you wear minimal clothing and that you lubricate your anus in advance. Do you have any questions?"
"No," I whispered, my mouth dry and my heart racing. I jumped in the shower and shaved my pussy extra smooth, then squeezed copious lubricant directly into my rectum. The anal lubricant, in a bottle with a special easier pointed nozzle for anal injection, had been left in plain sight on my desk at work the day before. I massaged more lube around my small, tight anus, and rubbed warm scented oil into my breasts and over my skin. I pulled on a short, sheer nightgown, and due to my height it only skimmed my hips and left my pink labia on show. My nipple piercings had previously ripped the fine white lace so my nipples were left exposed through the resulting holes, and I pinched them slightly to ensure they were prominent enough to emerge through the nightgown, then settled myself nervously against a side table by the front door.
When Mr Charles let himself in with his own key, he whistled as he held the door open for two more middle-aged men. The way I had arranged myself, my labia were slightly splayed and the men could see my nipples through the ripped nightgown but also most of my pussy as it was spread open for them. I blushed furiously but stayed still until Mr Charles pulled me by the arm towards my bedroom and called to his companions to take a seat on the couch for a few minutes. In fact we never got as far as my bedroom: Mr Charles spun me round so I was bent face-first over a bookcase in the hall, quickly unzipped his pants and slowly but surely eased his large erect organ directly into my rectum. Regular anal sex had loosened my anal muscles enough that he could penetrate me immediately: all this had happened within about 90 seconds of Mr Charles' arrival.
I groaned softly as I felt my young anus being opened and filled. I was so wrapped up in the pleasurable fullness that I did not realise the door to the sitting room was still open, and both Mr Charles' business associates, now sitting on the sofa, had a perfect side-on view of what Mr Charles was doing to his twenty-year-old secretary in the hall. As he leaned slowly backwards, the two men could see my boss's cock, glossy from the lubricant I had injected earlier, slowly pull out of my anus then drive quickly back in. Mr Charles had focused on the depth of penetration from our very first attempt at anal sex, and he still prioritised filling my anal passage to its depths over thrusting into me particularly quickly. Looking down, he pawed at my soft ass cheeks and held them apart as he watched his swollen organ invading my fleshy ass. I let out a high-pitched whine as I felt Mr Charles' cock reach the very bottom of my rectum and his bulging testicles press into my soft smooth labia.
"You are so beautiful my sweet girl, and I am so proud of you. I couldn't resist your little anus tonight but that's not why I have come. I promise I will look after you." Mr Charles grasped my chin gently, turning my neck and kissing my face and my lips. As his tongue entered my soft mouth I moaned gently and kissed him back, my rectum stretched and my nipples pleasurably taut. Then Mr Charles resumed his rhythm of thrusting as we kissed, my body twisted to allow him access to my anus and my mouth simultaneously as we stood leaning against the bookshelf. Just as I was feeling the stirrings of an orgasm, Mr Charles grabbed me tight and squirted hot cum into my rectum quite forcefully. I could feel the warm ejaculate splattering inside me and Mr Charles' large sex organ twitching and spasming as it propelled more semen into my hole. He continued to hold me still and kiss my neck until his penis slipped out of my anus and warm ejaculate began to trickle down my legs.