After my deflowering (see my first story) my sister and her husband regularly invited me to threesome parties. They used me as a sex slave and after a few weeks they decided to take the next step and make me participate in evenings with friends couples to serve as maids and I be offered. A few days before a first evening planned with a swinger couple who came regularly to their place to prepare and perfect my education as a small submissive, my sister decided to afford a strap-on. One afternoon she cross-dress me and we go to a sexshop to purchase it. This is the first time that I go out in the street in transvestite, I wear a very short skirt which shows with each of my steps the top of my stockings and my garter belt., the men turn around in my path and I am very uneasy. My sister must be delighted to feel like this, Humiliated, submissive and obedient to all her wishes. We enter the sex shop and my sister asks the seller for a strap-on, explaining that I am her slave. I feel humiliated a second time I lower my head and I no longer dare to look at the seller. He offers my sister different models and advises her on the purchase, she chooses a very realistic and large dildo. She asks the salesperson to try it on in position on her and the salesperson helps her to put it on her tight-fitting leather pants, once on her this penis seems enormous and it scares me. A customer walks into the store and admires my sister's show with her strap-on. she turns to me and asks me "so little bitch do you want it?" I dare not answer. She orders me in a very authoritarian way to kneel down. I am all trembling and I obey her, she approaches me and orders me to suck the god to show these gentlemen how I am a good bitch. I take it in the mouth and I suck it as if I was sucking my brother-in-law's cock but what a humiliation for me, I'm all red because I feel like I hit rock bottom, I'm a slut and I obey to all his obscene requests. The man runs his hand through his pants and strokes himself in front of me and my sister takes the opportunity to ask him if he wants to be sucked, he then pulls out his cock for me to pump. I take it in the mouth it is the first cock that I suck after that of my brother-in-law, it is short and thick. The man takes my head in his hands and kisses my mouth, he speeds up his movements my sister tells him to screw my mouth well and he cums deep in my throat, I swallow his hot cum, he withdraws and tell my sister that I am a big slut. and thank her. My sister insists that I suck the seller, he accepts and shows me his cock it is really big. I suck it and when it comes time to cum he withdraws to give me a facial, he has a huge ejaculation and my face is covered in cum. My sister pays the seller and before leaving he offers to come and show me off and from me offer in the projection room which is at the back of the store, she accepts and she will bring me there a few weeks later (I will tell you about it soon). We leave the sex shop, my face is cove ...

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