Re: the orgy, I like the idea. Zingiber's lead the charge on the Taylor/Hannah/whoever-gets-in-their-way pairings, and Vain and Yarkoz have done a bit with it as well, but there aren't (to my memory) all-out full cast gangbangs. I also agree with Henrytemp that the build-up is what's sexy in a lot of these pairings, in addition to the actual sex being depicted, but I don't think you have to sacrifice the one for the other if you have the lead time to make plain the unresolved sexual tension in both cabins. Victoria wants Zack and Dustin; Brandon wants Victoria and Ashley; and with Shawn gone, Kendra wants someone but doesn't care who. Just like that! It doesn't have to be directed at anyone in particular, but everyone should come to the game already horny.
So! Logistics. As far as gender imbalance goes, it would be simple at this point to write Shawn off and invite Lisa to one of the cabins. I guess that one depends on whether you want people paired up one-by-one or allow for couplings of three or more. And, you know, bunch of teenagers out in the woods: booze could make the inhibited members of the group more willing to go out on a limb and jump on a fun opportunity. Or those who don't want to join in could be fluffers, performing oral sex on spent members to get them eager again.
(And for people getting sexual in front of relatives, that really depends on the nature of each relationship, so I'll let you call those ones as you see them. Personally I don't shy away from the more incesty threads.)
I also like Zingiber's suggestion that Cards Against Humanity, or some variant thereof, be used to kick things off. Two ideas for that to help speed things along:
> Strip CAH: everyone except the judge and the winner have to remove an article of clothing at the end of each round.
> If someone hates their cards, they can return cards to the deck and draw new ones, but they have to remove an article of clothing for each new card.
Now, here's the thing. The orgy could also make for a nice launch point for some of these new plots you're cooking up. But, I'd imagine an orgy like this would be either so over-the-top and intense that, if it wasn't the very end of the story, it would living right next door to the end. So my question is, if the orgy is on day five, how many days do you envision would come after that until the main plot concludes?
PS: I swear I'm writing new threads! I've got a few with Shawn/Taylor coming up tonight or tomorrow.