I have been dressing for years and visiting various sissy chat sites, it was on one of the sissy chats sites I came across my on line Mistress. We started chatting, mainly me telling Mistress what I enjoyed dressing in and some fantasies. I am a sissy sub when dressed in either my female or sissy baby clothes, Mistress would set me various tasks to complete and I had to explain in for detail how I felt when doing them, one particular task was to phone a local dress shop..I was instructed to tell the assistant that I required a very femme dress that I would be able to curtesy in when required by my Mistress. Back on line I explained to Mistress that the assistant had suggested that I called in to try on a selection of dresses to find the correct fit and to ensure that I was able to curtesy in it, what a wonderfull idea said Mistress, call them back and make an appointment for the following day, no amount of pleading would change her mind. I knew I had no choice but to call as Mistress calls the shop herself to ensure I comply. The call was made and as I had questioned Misress, I was to wear a pair of my sissy baby pants, along with stockings, suspenders, and a sheer lace bra under my clothes and to take my heals and breast forms for my fitting.....I really was very scared and super excited as I walked through town then through the door into the shop. Good morning sir, can I help you I was asked by a middle aged very smartly dressed assistant, erm I mumbled that I had called the previous day regarding some dresses, ah yes I remember, follow me please, I was led to a rack towards the rear of the shop, just refresh my mind, what are you looking for, I explained that I needed a dress that I would be able to courtesy in when required. Slight smile from the assistant, so the dress is for you! yes I replied looking at the floor. I was led to the changing rooms at the rear of the shop, just pop in here and get ready, I'll be back in a second with a couple of dresses to start with, with that the curtain was pulled across and I was left alone, stripping off my clothes I popped my forms into my bra and slipped on my heals, now I'm dressed in a white lace bra which shows off the nipples of my breasts, a matching white suspenders, black stockings and a pair of see thru pink plastic baby pants with white lace trim around the legs, I'm also very excited and unlike most sissies I have a large clitty which was as hard as a rock....... A dress is pushed through the curtain, try this one sweetie the assistant sings quite loudly if you have any problems just call I'm just out here, thank you I reply taking the dress. A short full skirted black lace affair taking it off the hanger I step into it and lift it up and over my excited clitty all the way up to my shoulders, I'm having trouble reaching back for the zip, is everything ok she asks, I explain I'm having trouble with the zip, oh no problem she said and the curtain is pushed aside as she step into the cubicle....omg no one has ever seen me in a dress, and now am here in the changing room with a Lacey black dress mostly on, ooh I see you're Mistress has made you wear your pretty baby panties, very nice, the assistant said as she slowly raises the zipper ..... now I'm fully dressed looking at my feet in the mirror with the smartly dressed assistant standing behind me. MMm very nice she says as she fluffs out the full skirt, thank you I whisper as I blush scarlet, and are they stockings or tights she whispers in my ear, stockings Ma'am I whisper, lovely, now take the hem in both hands and raise the dress so I can see, but, but stammer...she quickly swats my backside, didn't your Mistress tell you to obey all women, she hisses into my ear, shocked and blushing I start to raise the hem, look in the mirror I'm ordered, I look at my self slowly raising my dress until my stocking tops are on view. Good girl, now higher, I try to plead with her but she won't hear any of it, so the hem travels higher up past the frills around the legs of my plastic panties, stop she commands, I'm now looking at myself heals, stockings and pink baby panties on view, and my hard clit clearly on view. Very nice she whispers running her hands up my stockings, omg it feels fantastic, I start moaning quite loudly, that will no do she says, she is moving and wriggling behind me, these will help keep you quieter, with that she pushes her body hard against mine and one of her hands cups her red knickers hard against my nose and mouth, omg I can smell her wonderfull scent, her other hand slips around and the heel of her hand rests on my throbbing clitty and her fingers curl over my balls to the area between them and my anus. Uuuu I moan into her panties, does that feel nice sweetie, I can only nod yes, good I'm going to show you how to cum like a woman, the pressure on her fingers increase massaging me between my balls and anus, she is sending me into heaven, that's it sweetie it feels good to wank into your panties doesn't it, I can't answer, my body wants to cum so much, now I want to see my sissy cum into her panties she tells me as her fingers keep up the rubbing and the heal of her hand works on my clitty. That's it sweetie be a good girl and cum for me, orgasm into your panties just like any girl would who is desperate to cum, my god I'm so close as she keeps up the rubbing I can only moan louder, yes that's it be a good girl,.....ahh I moan into her panties as I Cumm flooding my plastic baby panties, she continues to rub making sure my cum is all over my clitty and balls. Looks like that dress will do just fine the assistant tells me as she lowers the zipper, I'll wrap it for you while you get changed, and with that she is gone, Shaking I dress in my street clothes and leave the dressing area, straight into a very pretty lady looking at the sales rack, her eyes widen as she realises I have come out of the changing room, walking to to till the assistant said rather loudly your dress is here sweetie handing me the bag as I pay, taking my hand she pulls me close and whispers....next time your Mistress sends you I'm going to have fun with my strap on. I leave the shop very quickly feeling my cum cooling inside my panties. I still don't know if the assistant is/ was my on line Mistress as I have logged on again, yet! I can't imagine being in the shop again only next time I know I will be bent over and used.