She reveals her trickery to you just before the guests start showing up.

The next week was, dare you say it, normal. Tanya didn't try to drag you into anything perverted - if anything, the sex life you, she and Anna shared moved to a less hard-core, more playful and romantic atmosphere. You, of course, were perfectly happy with that. Having the 'girlfriend experience' was one of the things you'd most fervently hoped for when you went along with getting the tattoo and everything else. For a while the only daily reminder that you had of Tanya's perverted intentions was the occasional comment she'd make while the three of you were watching a movie together. Well, that and the time that you found a giant-sized box of condoms sitting in the freezer - against your better judgement you decided not to ask.

Needless to say, Tanya was quite concerned with making sure this masquerade would take place on the most risky week of your cycle. By coincidence (or perhaps not), it was pretty darn near Anna's most **** time of month, too. Tanya herself was earlier on hers than either of you; she'd just be about finished having menstrual cramps two days before the masquerade, so she was theoretically safe, but not the kind of safe to set your watch to. Out of fairness she offered to use 'fertility friendly lubricant'... and then, a day later, got so excited about the idea that she insisted you and Anna use it, too.

Tanya was able to get the day of the party off of work so while waiting for Anna and the rest of the 'guests' to start trickling in, you and she took a look at the wide variety of costumes that she'd borrowed from some 'friends' of hers.

"Who exactly did you say you got all this from again, Tanya?" you ask, examining the assortment of sexy costumes you're putting up on hangars. "It's pretty far from Halloween, I wouldn't expect any places selling this kind of stuff to be open. Did you special order it?" You look at a 'sexy angel' costume that was anything but angelic, consisting of a snug white teddy with plush wings sewn onto the back, with white stockings below. There are a lot of other old standbys, too; several variations of the sexy police officer... the nurse, the princess (you suspected who she intended that one for), a short-skirted clown costume, a lady liberty costume that was mostly a bikini... and of course domino masks in a variety of colors and patterns to go along with them. In a few boxes that hadn't been opened yet were male costumes for those that wanted them as well.

"Heck no, Ellie. You should know me better than that by now... I came up with this idea months ago, and the whole reason I started thinking about it in the first place is because I saw the huge collection of costumes and props that a few friends of mine who make adult movies had on hand. You've already met one of them." When she brings up your first real risky experience, it makes your cheeks flush.

"Wow..." you say, a little awe-inspired by your pervy girlfriend's apparent connections. "They make a lot of weird stuff, huh? I hope all of those have been thoroughly put through the laundry."

"Yeah," Tanya says, "and it's especially appropriate for our purposes, considering where they come from. I'd bet money that at least one of these outfits has already been an accessory to someone getting pregnant." she then got a wicked smile.

"Hehehee, and speaking of which - you might say that those costumes aren't all that I'm borrowing for this, Princess." She came up and cupped her hands over your left tit and pinched your nipple between two of her fingers before you could ask what she meant.

"So, to start with, I managed to pull two other like-minded ladies into this from the local college who think doing something so risky is just as hot as I do. Luckily one of them is in a sorority, and used her position to tell four new pledges that part of their initiation is going off birth control and attending a party like this. But, that was still a bit smaller than the target number... you remember the odds I was talking about, right Ellie?"

You nod along, belatedly starting to see red flags popping up about this whole scenario.

"Well," Tanya continues, "I owe my 'movie maker' friends a big favor, because they decided to help me out by sending a half a dozen amateur wanna-be 'actresses' our way... the ones that had told the studio that they needed to use condoms in any scenes they took part in."

Tanya was licking her lips lasciviously now and gave you a quick, excited kiss. "I'm promising them that I can help them get lots of work if they 'liven up' this party of ours, Princess, which is true. The only catch, for both them and those sorority pledge girls, is that the condoms that you and I are going to be passing out at the beginning of the party have been heated and cooled repeatedly, and I stuck a safety pin through them all for good measure." she said with a malicious giggle and a mischievous twinkle in her blue eyes, her hands starting to get more and more aggressive in feeling you up.

"W-wait..." you say before she can start multitasking between molesting you and helping you into your pink princess dress, "That seems... wrong. I don't know if I can be a part of this, Tanya." You thought back to how frightened (though also shockingly aroused) you were that first time that Tanya had offered your fertile pussy up while you were all done up in bondage gear.

"After I've gone to all this trouble? Oh no no, you can't back out now, Ellie." Tanya says running a finger up your spine. "You know there's going to be a penalty for that. I'll have to really get creative. And just to start with, you would be taking all of the excess cocks from the 20 or so guys I invited yourself without any guests to give you a reprieve."

You're feeling like you're caught up in her web again... Before you have much time to think the doorbell rings as the first 'guests' start arriving. Tanya smirks arrogantly and firmly points at your dress, giving your bottom a hard spank for emphasis. This is really shady, even for Tanya. You hastily consider your options...