Bill gets to pick out her costume

The drive to the fancy dress store didn't take long, but sharing the car with Bill even for a few minutes made Morgan feel kinda weird. She couldn't understand why he wasn't looking at her and staring at her long legs in her short skirt, or at her nipples which were already poking through her bra-less top. It made her mad that he had such control over her, that she was getting wet just at the thought of being so close to him.

As they pulled up outside the store Morgan made sure she got out first and walked slowly inside, giving Bill the chance to watch her ass and legs as she went inside. I wanted to see more, to see if Bill would touch Morgan, try to **** himself on her or if she would make the first move in public. I waited a few minutes before following them inside, keeping my face as covered as possible, my cock hard at the thought of watching them get closer.

"Hey Morgan, how about this one", I heard Bill shout out and saw him holding up a witches outfit.
"Very funny asshole", she replied, "No way in the world am I wearing that, but at least it would cover me up and stop you staring at my tits all night".

The girl working in the store looked up from her paperwork and smiled, thinking Morgan and Bill were an item and having some fun. She was bored and could do with some entertainment herself.

"Get in the changing room Morgan and wait for me", said Bill. Morgan did as she was told and wondered what he would bring to her. As she stood there, looking into the full-length mirror, she couldn't help but admire her body, moving her fingers slowly up to her nipples and feeling how much they were sticking out. She circled each one, slowly pulling on them and feeling the juices building in her pussy. She had yet to cum that day and needed to, whatever the situation. Morgan moved on hand down to her thighs and hitched up her skirt to look at her thong, noticing how her wetness had started to come through and show.

"ahem. excuse me Madam", Morgan jumped as she heard the shop girl's voice outside the curtain. "The gentleman has asked me to give you this to try on".

Morgan laughed. Typical, he can't even be bothered to come in here himself. And gentleman? Hmm. She opened the curtain a little and saw the girl immediately stare at her tits and blush before putting the outfit down and walking away.

The girl had left a devil's outfit. One that wouldn't leave much to the imagination. Morgan stripped off her vest and skirt, and decided the thong had to go too. Quickly she slid on the short pleated skirt, and the bodice that just about kept her tits from spilling out. "Bill, get in here and see what you think"

Morgan looked hot, she knew that and loved looking at her body. She was brought out of her reverie by Bill ripping the curtain back and slapping her ass hard as he walked in. "Bastard. So what do you think? Hot enough for you?"

I moved closer to the dressing room, wondering whether Bill would try something on in public.

"Very nice Morgan. Makes you look like a complete slut, so it suits you. Turn around for me and bend over".
"Subtle Bill. Very subtle"
Feeling so horny Morgan did as he said, slowly turning round before bending down to touch her toes and show Bill that she wasn't wearing anything underneath. The shop girl was also intrigued and stood near to the curtain pretending to tidy some racks of clothes.
Morgan wondered what she should do next. Grab Bill's cock and fuck herself with it? Slide her fingers into her cunt and give him the show of his life? Or build up the tension even more and ask the shop girl wha she thought of her outfit...