You have to read these:
Bloody Potters by lq_traintracks (Draco/Albus Severus, Harry/Draco UST | NC 17)
Effed by blithelybonny (James Sirius/Scorpius | NC 17)
Love Thy Neighbour by birdsofshore (It's an orgy: various non-specific m/m combinations |R)
Trust me, you just have to. It all happens at the annual Potter BBQ aka orgy, apparently and it's the most awesome thing you'll read along with the whole Anywhere but the Bed Master List.
There's awesome Harry/Sirius by digthewriter, and Hermione/Pansy/Ron and Harry/Draco by lq_traintracks and more Harry/Draco by barefacedbandit and some Seamus/Pansy by lightofdaye.
And you shouldn't miss it, really. It's brilliant over there, and naughty, just so much fun! And it's only Thursday. So if you never could get the hang of Thursdays, this is the way. ;)