I'm assuming you weren't part of the 5 couples otherwise you wouldn't be so upset.

Well, problem: Brother Solution: put a porno mag on a stick and put it on his back so he'll run for it

Your brother is an ass for throwing a party in your home, presumably without your consent. He owes you the cost of damages,including a new comforter if you are so inclined. But as someone else pointed out, you do sleep in this soup every time you go to a hotel (where the comforters are not washed very often). That said, it's a difference between a few nights at a hotel and every night under the comforter under which five couples (I hope not all at once) did the nasty.

You can say sex happened here

Wait how do u know how many couple's had sex under your comforter

You should have joined in.

Don't you know better? You should hide your stuff.

Was it at the same time or consecutively? LOL

OP you know what time it is?! Time to buy a new comforter!

Dang