You help Marla pick a new swimsuit

You follow Marla up the escalator to the second floor, where she quickly heads towards a store. Her brown locks catch the sunlight shining through the big roof. She wears a really short black dress and her usual golden jewelry. Dressed like this and with her sunglasses, she kind of reminds you of a movie star from the eightees.
Marlas dress compliments her figure well, you needed a lot of concentration in the car as to not look at her lap too much, while sitting, it left little to the imagination.

You smile as you see some heads turn while she walks by, then the two of you reach the store.

You follow Marla into the store, arkwardly realizing that you´re the only man there. She picks out a couple of bikinis, then she makes her way to the changing room.
You dont follow her in immediately, not wanting to seem weird, but then she asks you in. "Can you help me with my dress please?"
You make your way into the cabin. Marla turns her back at you and leans with both her arms against the wall in front of her, pushing her ass your direction. You feel your dick harden, you know shes teasing you.
You carefully pull down the zipper, under which marla wears, to your dissapointment, black underwear. She turns around and steps out of her dress. Then she softly pushes you back with one hand and says: "Thank you."
Moments later you find yourself in front of the changing room, the curtain closed between marla and you.

You look around, to find another woman look at you amused, while the cashier keeps a an close eye on you. You get the feeling she suspects Marla of you to do something, but you just smile at her and turn away.

Then the curtain opens again.

"Well?" Marla asks. "What do you say?"

The first two piece she picked has a leopard pattern, something you usually think is pretty tacky, but it works surprisingly well on her. While the lower part looks like it fits just right, the part around her breasts kind of looks as if it is about to burst.Marlas tits arent ginormous, but yet above the norm, especially for her figure.

Marla smiles. "I can see by your expression that you like it. I´m gonna try a few others on anyway."

Again, she vanishes, only to appear again a bit later, this time in pink. Two straps go around her stomach, and it has some golden element, which look as if they would pull you down when swimming. Yet the whole set looks pretty luxurious, like something you´d see on a model by a pool in a large villa.

Over the next couple minutes, Marla tries on more bikinis, while your dick strains harder and harder against your pants.
You really need some relief soon. But how, with the cashiers stern eyes watching you?