Kara refuses the couple

"Uh... I'm sorry, I don't think I'm the right person for that." Kara steps back out through the door again, the last thing she hears before it closes is the man saying "You can just watch us fuck if you want."

'I think not, I should really try to see if there's any leads here... so far it's just been a mostly friendly sex club'
Walking down the hallway she looks in the next window she passes, seeing a leather clad woman literally walking over a tied up man, his naked body full of bruises from her shoes.
'Ok, and apparently less friendly parts... though judging by his, um, excitement... he's really enjoying that.'

The next door she passes has no windows, just a door marked with 'Shibari'
Opening it and peeking in she sees a woman suspended in the air, ropes going from around her head and down to her crotch with other ropes crisscrossing her torso with every place they cross the vertical ropes they turn back leaving a complicated looking diamond pattern. Her legs are tied back towards her ass and her arms meet behind her, connected at the elbows. Next to her is a man dressed in jeans and a dress shirt doing something with several lengths of rope.
'Wow... that looks straining... and intriguing, to be powerless like that... huh...'

Closing the door and heading towards the end of the hallway she notices some light from behind a curtain, pushing it to the side she finds a more utilitarian looking door marked 'Staff only'.
'There's light coming out there... yes! It was open, ok, let's just slip in and see.... stairwell... I say we go.... down, suspicious stuff tends to be in basements... I think.'

Reaching the bottom of the stairs she sees a hallway through two opened doors with the words 'Gilded Cage' on them, the hallway itself has a distinct hospital feel, everything is white and sterile and a few doors down there's a bed on wheels. At the far end of the hallway there's another pair of doors, these are closed and have the word 'Blaze's' on them.

Taking a few tentative steps, she starts to sneak down the hallway.
'Hmm, the door by the wheeled bed has 'Laboratory' on it... curiouser and curiouser as it said in the book'
Reaching the door she presses her ear to do the door, but hearing nothing at all she carefully opens it.

Meanwhile in a nearby control room, a guard presses a button connecting him to his boss "Ma'am, one of the masked guests of the cage just snuck into Lord's lab, the power detector says she's human."

"Another one? He's a popular target from both directions tonight, let him know there's a second guest in case he wants to change his response."