In the dressing room...

You follow Kay into the only dressing room, as she excitedly takes the clothes from you and sets them down. "We're gonna have so much fun today baby" she says practically jumping up and down with happiness. She kisses you on the cheek as you begin to undress. You stand there naked as she sorts through all the different pairs of underwear. She begins to hand them to you, and you spend the next half hour trying on different pairs of panties for her. You go through satin, lace, silk, and cotton pairs. She examines you as you switch from boy shorts to G-strings to thongs, giving her yay or nay to your look. You like the way the satin feels on your little penis and she picks out several pairs for you. She likes the way that lace reveals your tiny dick, and she lets you pick out a pair that you like. You settle on a soft white pair with very a very see through pattern embroidered on them, as well as a little pink bow that rests just above your penis.

Kay quickly agrees that you look very cute in them. She also make you try on a satin nightie and falls in love with the sight of it on you. She grabs the things you both have decided on and leaves the changing room to pay for them, telling you to stay in there as she wants you wearing the lacy ones in particular when you leave there. You do as you're told, waiting patiently for her to return with your new underwear. You begin to consider jerking off quickly, but you reconsider when you think of how Kay might feel about it. She returns with bags in hand and gives you your present before telling you she will be outside waiting for you. You quickly slip them on, checking how nicely they show off your small penis and little ass cheeks, and begin to get dressed...

Reaching for your clothes you notice that they aren't there... Kay must have brought them back with the stuff you didn't want! You stand in the room alone, sporting nothing but your new lacy panties and a plainly visible tiny erection. You panic as you crack the door open and see Kay outside the store scrolling on her phone waiting in the busy common area. You close the door, figuring she'll come in to check on you eventually and you won't have to reveal yourself to anyone. A knock on the door ends that hope quickly.