Try the window

"The window!" Rose says, putting at the small single window beside the door. "We can get in that way."

Lily just nods silently reaching up and finding that the window is in fact open. "You go first." She says, cupping her hands and boosting Raven up, getting a face full of her panties for a moment before Raven vanishes inside.

Moments later Raven reappears, reaching back out to help Lily scramble up the wall and into the window.

As Lily gets half way through you figure it's time to strike again. Lily suddenly stops, the chains on her trousers catching against the window. "I'm stuck!" She whispers as the two of them suddenly begin to hear voices coming out to the field.

With only seconds to act Raven grabs Lily and pulls, Lily finally sliding through the window, but her trousers and shoes fall out the other side.

Both girls tumble to the floor, and Lily lands straddling Ravens face, now dressed in just her bra, thong and socks.