This Halloween, the most earth shattering thing happened in our friend group

So, I'm a straight guy who's part of a longstanding nerdy friend group made up of both guys and girls. There's a bunch of guys in the group, and three main girls: C, S and A.

In addition to them, A and C live together in a house with a girl, K, who is basically their closest friend. So she knows us very well too.

A few years ago, A moved overseas to study for a couple of years, and while there, she met a guy, Alan, and they got into a relationship.

But at some point, A had to come home, and so the relationship was long distance for a short time. That is until Alan decided he'd come here for a while to stay.

It only made sense, at this point, for Alan to move in with A, C and K, especially because they had a spare room. So he did.

Fast forward to this Halloween, and the girls in the group decided to have an exclusive girls only Halloween gathering, as opposed to our regular one. A, C and K would host.

The only problem? Alan lives with them. But instead of ask him to go out for the night, they told him he could stay, so long as he kept it a secret.

So Alan got to be the only guy there.

The other guest was S, who, unexpectedly, brought with her her older sister.

I am absolutely exploding with jealousy, and I have details beyond that which you'll WANT to hear that I can privately disclose. They'll blow your fucking mind.