| I'm 18, but here's what I think you should do. Bring up sex casually with both of them and just talk a bit about it, then ask something along the lines of, "What do you think about threesomes?" Then do that with the other one. After that, you can't just go to both and say, "Hey, this other girl likes threesomes too, let's do it." Instead, naturally meet with both of them at the same time at the party and take them to a place where there's not much noise to make them feel comfortable around you. Then if it works, you can use kino with both at the same time which will escalate to the sex stage and that's when you find a room ;p
If they ask why you're asking them about threesomes, just say something like, "I don't know but an odd number seems more interesting." It's just an easy way to answer it without looking desperate, and it may make them laugh as well.
But you need to be romantic with both. While you talk to both of them at the party (where there's a lot of noise), keep switching from leaning in left and right to say something to her ears. But first, talk to them from a distance to show you're not too interested and since there is noise, that will give you the excuse to alternate between leaning from ear to ear to respond. While you're saying something into her ear, you can also lay your hand on her shoulder (as kino).
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