The attic, their secret sanctuary, is filled with the scent of old wood and something more primal. The siblings, bound by blood and desire, move in a slow, sensual rhythm. Her hands trace the hard planes of his chest, while his explore the soft curves of her body. They're a tangle of limbs, their breaths coming in ragged gasps, as they give in to their forbidden craving. The room is a symphony of their whispered pleas and the wet, eager sounds of their bodies joining, as they lose themselves in the ecstasy of their shared secret.