Follow them up the stairs.

Something catches your eye and you turn for a moment. When you look back the trio is gone. You see the big guy is fumbling with the keys. The second has Anna pressed against the wall, her shirt is open again and he's sucking on one of the huge tits as his hand plays with the other, you can tell from their position that his cock is pressed up against her cunt. Anna is moaning contentedly. The big guy finally gets the door open.

He slides the door open and turns to Anna who is gasping from the tall guy's groping and dry-humping.

"Hey honeydrips this is your lucky night, we'll gonna let you inside the VIP-lounge. Come in and make yourself comfortable!" the big guy says. The tall guy grabs her by the hand and she submissively follows him inside. You race up the stair and try to follow the trio inside but the large guy turns to you with a threatening look.

"Sorry pal, invites only."

The door slams shut behind them and you stand there gulping for a moment. You push down the handle and to your horror you discover that it's locked.