It's the pig that starts walking towards you, her naughty grin growing larger with each step. Her otherwise adorable face might give you the idea that she was innocent, were it not for the way that she was looking at you just now or for the fact that she's apparently completely nude, her latex skin free of any sort of covering. As she finally comes near you, she begins to speak in a mock-innocent sort of voice.
"Ooh, hi. You're cute. Can I sit on your lap?"
As she says this, you can see her entire face moving to articulate the words, removing any hope you may have had that these were just girls with some creepy costume fetish. Your fear renewed, you begin to struggle hard as she turns around and starts sitting. Before she makes it down, you notice a somewhat hoof-like hand reaching for your pants, unzipping them and pulling your underwear down beneath them just enough to allow your member to escape and doing it all with an incredible amount of dexterity within only a second. As soon as she's got you out with her quick hand movements, she sits on your lap, plunging your penis into her unprotected vagina. The whole experience of being violated like this has left you completely flaccid, and you hope that this will be enough to let her know that she won't be able to have her way, but the second you're inside her you can feel the walls of her vagina massaging you, pulling you further, and forcing you into an erection that fills her. You keep struggling, but she's too heavy and you're too restricted by the ropes tying you to the chair for you to put up any real fight. Even so, you try, and all the while she retains the naughty grin and otherwise innocent look, staring back at you while she pulls your member in deeper and deeper...
Eventually, after it's become very clear by your reluctance that you have no intention of giving in to her attempts at seduction, the pig girl gives up, rising from your lap with that naughty grin replaced by an exaggerated pout. "Aw, you're no fun," she says as she stands and walks away from you, putting on a dejected act as though she'd done nothing during her little sit-down. As she rejoins the others, you come to realize that she snuck your penis back into your pants and closed them back up as she was getting up, though now you can see a bulge in them (it seems she succeeded in making you hard, at the very least). Something about it feels a bit... off, but you figure you can chalk that up to the fact that it was just masturbated by a latex pig-woman's vagina.
You become aware that the three "girls" are now whispering, every once in a while glancing at you. After a time, and apparently having seen that there's nothing to gain from you, they all walk out of the shop, leaving you alone. More importantly, this leaves you with a chance to work out an escape plan!