Remember that video? Time to play along.

Tanya was out of the room for a minute so you went ahead and pulled on your princess dress. It was, after all, your fault for winding Tanya up like this, knowing how over the edge she got about her fetishes, and you were sure that you at least would be baring (or rather, bare-backing) yourself to the winds of chance. It was surprisingly conservative as far as things at a party like this went. Although it was really tight around the chest and hugged your cleavage nicely, the trailing skirt went all the way down to your ankles, and atop your head was a classic pointed hat with a dangling silk tassel. Of course, you weren't wearing a bra or anything under it, so anyone looking at you from the front would have a nearly unimpeded view of your newly pierced nipples.

When Tanya came back up, she had already changed, too. She had reserved an outfit for herself and, naturally, it was one themed with yours, a 'sexy dragon' to menace the princess. What it amounted to was a barely thigh-length cleavage-baring minidress with a green dragon-scales pattern on it, with a pointy plush tail dangling from her lower back, and a pair of green horns poking up out of her costumed hair, finished up with boots that looked like lower claws. She looked like she was enjoying herself immensely already.

And seeing just two of the girls she'd invited, you were starting to see why - they were both totally gorgeous, though not quite as curvaceous as Tanya or Annabelle (that was a high bar indeed). Tanya directed them to the costumes and masks which the first pair of guests giggled and applauded over.

Tanya turned back towards you like she was about to introduce you but before she could, you pulled her aside and grasped her shoulders firmly, giving her the sternest look you can muster before leaning in and whispering to her.

"Tanya, you know I love you, and... it was me that suggested this, but won't you please change your mind, or at least warn everyone before things start? You really shouldn't trick girls into having unprotected sex like this. If you don't tell them then..." you felt your face growing hot and your confident voice start to die in the face of the amused glance her gorgeous blue eyes were shooting you, "then I'll have to..."

Tanya didn't miss a beat. "Oh, you don't want to do that, my beloved Princess, hmhmhm. I think you've forgotten about our sexy video recorded at your parents' place. You're not spoiling our party unless you want that to go straight to daddy. Including a new few additions."

You swallowed, having sincerely been hoping she wouldn't feel the need to bring that in. "But..." is all you manage before she gives you a hard, double-handed grope, pulling you closer to her by your ass and giving you a hot kiss on the lower lip, then teasingly pulling away before you can really get into it.

"....fuck." Is all you can manage, your face reddening - somehow the guilt you feel for going along with this astonishingly unethical game of hers only heightens your own excitement.

"Ah, I see you've already grasped what I want you to do if you don't want that video showing up." She gives you a quick grab by the crotch, making you gasp and whine, before going back over to the two partygoers.

"So, we'll be using real names as little as possible at this party," Tanya said to both you and the new girls, "but since you guys only gave me your porn names to begin with I think we're good. This is the most wonderful girl I've ever met - I like to call her Princess anyway, so go right ahead and do the same. It's how everyone should treat her."

"Princess, let me introduce Felicity and Vanessa." They'd already gotten dressed, and a shudder of excitement ran through you.

Felicity was a tall, leggy brunette with wavy hair down to her back, black-rimmed glasses and a delicate face. Her b-cup was less impressive than yours or Tanya's but her slender sexy waist and sultry legs still gave her the look of a model. She'd put on a typical sexy nurse outfit with white fishnet stockings, stiletto heels and a figure-hugging white top. Instead of a masquerade mask, she put on a surgical mask. She gave you a prolonged wave and giggled. "So, um, is this your first time doing something like this too?"

You nod, gulping down your unease. Vanessa, standing next to her, was a voluptuous black girl with a small afro. You weren't sure if it was natural or not but she was the equal of Tanya in the bustline department. She was still in the process of putting on a cute witch costume with a tattered skirt that barely concealed her ass and made her F-cup bosom wobble enticingly with every step she took in her knee-high leather boots. "Like what you see, honey?" she asked you with a confident grin and a bat of her eyelashes before putting on her own party mask.

Telling them nothing about the dangers to their exposed fertility they'd be facing as soon as the male guests started showing up, you just smiled coquettishly and lead them and some of the other new arrivals over to the kitchen, showing the sumptuous assortment of food and drink that Tanya had thrown together.

You rationalized it; Tanya wanted this so dearly, and she'd gone to so much planning and effort to make it happen. If having ten girls be deceived into risking getting themselves knocked up in addition to you, her and Anna taking countless loads was what she needed for this masquerade to be truly memorable, who were you to argue?

Over the next four hours, more of the attendees started trickling in, including some of the first guys. The latter were pretty wary, to start with - they certainly didn't start feeling up and yanking the clothes off the first girl they saw, and kept themselves to teasing comments and lingering glances while they got their own masks and outfits on, sampling the food and discussing their imminent conquests.

One of them sidled up to you while you were looking for where Tanya had gotten off to. He was a a tall, muscular man who looked to be in his late 20s or early 30s, wearing a firefighter outfit - complete with a hood that covered everything except his eyes, but near-naked below the coat except for tight yellow speedo briefs that showed off his package. He put his hand on your shoulder for attention.

"Hey there... Princess, part of a couple with that kinky girl in the dragon-dress that set this all up, right? I don't know if she told everybody everything, but she did me, and I think it's a hell of a turn on. I've been waiting until all the girls show up because, as she said, most likely the first load of the night is going to be the most potent, so I'm making up my mind on whose fertile pussy I'd like to take a shot at first. Right now, I'd have to say it's you. But since you're with *her*, I'm betting that you like to watch, too. I think the messy part is going to be starting pretty soon here, so as part of a 'thank you' to you and her for coming up with such an awesome idea, how about you pick which one of those girls I warm up on?"

That gives you a strange thrill... taking someone else's fertility into your hands, being able to pick someone for the eager, throbbing cock you could see straining against his underwear to seed. You felt butterflies in your stomach. Looking across the room, you saw Tanya again at last, talking with a couple of guys who had just shown up and whispering to them conspiratorially, handing them masks and pointing at the girls (and, you're pretty sure, at you). You finally understood why she got such a thrill out of risking you the way she had. Now you'd get to return the favor, not just on her, but on anyone you chose. You gave the perverted fireman a shy smile as you turned and surveyed the guests milling around the food tables...

Aside from Felicity and Vanessa, there were four additional prospective porn actresses who Tanya had told they'd be coming to this orgy to help show off their skills and get them cast in some lucrative projects.

First was Randi, a shy girl-next-door freckled redhead that was similar to you, except even less experienced and with only little a-cup breasts, wearing a cute cowgirl outfit with daisy-dukes that cupped every curve of her athletic bottom and a bandanna over her mouth.

Then there was Tasha, a curvy, pleasantly plump asian girl who apparently wasn't afraid of stereotypes, since she was wearing a dark purple ninja costume that covered most of her face.

Third up was Mandy, a stereotypical tanned, bleach-blonde ditzy girl with big silicone-enhanced tits that were a match for Tanya's in size (if not feel), wearing a scuba diver's outfit that hugged her curves but covered most of her body, including her face, but had cutouts allowing her bare breasts to poke through and was crotchless, exposing her shaved pink slit.

Last among the amateurs that Tanya's pervy friends had sent her way was Willow, also with the bleach-blonde look going on but her hair kept to only neck length, though it wasn't visible at the moment. You think her outfit was part of a trio with yours: Willow wore a knight costume, if it could be called that, that was basically a strapless minidress with a steel grey color and a chainmail pattern paired with a couple of thigh-high flared leather boots with high heels. Her head and face were totally hidden behind a plastic knight's helm, complete with a bright red feather plume on top.

Then there were the five sorority girls; you didn't know which ones were in on Tanya's crazy game and which just getting dragged along as part of their initiation, but they all seemed to be having fun with it, snickering at eachother's costumes and starting to flirt with the other partygoers. First was Janna, who you were reasonably sure was one of Tanya's other kinky friends because she'd specifically requested the kinky devil-girl costume.

Second was Kiki, a black-haired asian girl who was wearing a space alien costume which was a tight grey bodysuit (crotchless, of course) and a bug-eyed 'little green man' mask.

Third was Betty, a pale, slender girl wearing a monkey costume that had holes to show off her big firm breasts and pink nipples - she looked embarrassed by it was was staying in the corner.

Fourth was Kimberly, a wavy-haired natural blonde cheerleader type in a playboy bunny outfit, who was already starting to get drunk despite having been here less than an hour.

And lastly was Jessica, a somewhat plain girl with narrow hips and a boyish figure with her black hair in a ponytail, dressed in a sexy police officer costume that was skimpy even by this party's standards, with a microskirt that only half-covered her unshaven pubes and a blue bikini top with a plastic badge on one breast, with the requisite hooker boots and oversized dark sunglasses helping to conceal her face.

Then you looked back at the guys. Only five had shown up so far, but according to Tanya she'd asked them to show up later so the girls didn't feel outnumbered when arriving and get scared off. Aside from the handsome fireman you also saw a couple of punk-style guys who looked like Tanya's friends wearing Victorian steampunk-esque outfits and looking like all-around dorks. Then there was a football-player-looking black guy wearing a superhero costume to show off his impressive muscles. And lastly there was one who looked more like a businessman in his thirties, wearing a pinstriped suit and a phantom of the opera mask.

You knew that things were quickly about to pass the point of no return... and you relished that. You licked your lips and put your hand on the firefighter's shoulder, making your choice...